Merge pull request #377 from 0xProject/feature/signed_unsigned_order_contracts

Use SignedOrder and Order types from 0x.js

9 files changed, 525 insertions, 590 deletions

diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index 5cedaddc9..9cfc68418 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -3,6 +3,7 @@ import {
     LogErrorContractEventArgs,
     LogFillContractEventArgs,
     LogWithDecodedArgs,
+    SignedOrder,
     TransactionReceiptWithDecodedLogs,
     ZeroEx,
 } from '0x.js';
@@ -20,7 +21,6 @@ import { Balances } from '../../util/balances';
 import { constants } from '../../util/constants';
 import { crypto } from '../../util/crypto';
 import { ExchangeWrapper } from '../../util/exchange_wrapper';
-import { Order } from '../../util/order';
 import { OrderFactory } from '../../util/order_factory';
 import { BalancesByOwner, ContractName, ExchangeContractErrs } from '../../util/types';
 import { chaiSetup } from '../utils/chai_setup';
@@ -46,7 +46,7 @@ describe('Exchange', () => {
     let exchange: ExchangeContract;
     let tokenTransferProxy: TokenTransferProxyContract;
 
-    let order: Order;
+    let signedOrder: SignedOrder;
     let balances: BalancesByOwner;
     let exWrapper: ExchangeWrapper;
     let dmyBalances: Balances;
@@ -84,14 +84,14 @@ describe('Exchange', () => {
             exchangeContractAddress: exchange.address,
             maker,
             feeRecipient,
-            makerToken: rep.address,
-            takerToken: dgd.address,
+            makerTokenAddress: rep.address,
+            takerTokenAddress: dgd.address,
             makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
             takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
             makerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
             takerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
         };
-        orderFactory = new OrderFactory(web3Wrapper, defaultOrderParams);
+        orderFactory = new OrderFactory(zeroEx, defaultOrderParams);
         dmyBalances = new Balances([rep, dgd, zrx], [maker, taker, feeRecipient]);
         await Promise.all([
             rep.approve.sendTransactionAsync(tokenTransferProxy.address, INITIAL_ALLOWANCE, {
@@ -147,80 +147,85 @@ describe('Exchange', () => {
     describe('fillOrder', () => {
         beforeEach(async () => {
             balances = await dmyBalances.getAsync();
-            order = await orderFactory.newSignedOrderAsync();
+            signedOrder = await orderFactory.newSignedOrderAsync();
         });
 
         it('should create an unfillable order', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: new BigNumber(1001),
                 takerTokenAmount: new BigNumber(3),
             });
 
-            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountBefore).to.be.bignumber.equal(0);
 
             const fillTakerTokenAmount1 = new BigNumber(2);
-            await exWrapper.fillOrderAsync(order, taker, {
+            await exWrapper.fillOrderAsync(signedOrder, taker, {
                 fillTakerTokenAmount: fillTakerTokenAmount1,
             });
 
-            const filledTakerTokenAmountAfter1 = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountAfter1 = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountAfter1).to.be.bignumber.equal(fillTakerTokenAmount1);
 
             const fillTakerTokenAmount2 = new BigNumber(1);
-            await exWrapper.fillOrderAsync(order, taker, {
+            await exWrapper.fillOrderAsync(signedOrder, taker, {
                 fillTakerTokenAmount: fillTakerTokenAmount2,
             });
 
-            const filledTakerTokenAmountAfter2 = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountAfter2 = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountAfter2).to.be.bignumber.equal(filledTakerTokenAmountAfter1);
         });
 
         it('should transfer the correct amounts when makerTokenAmount === takerTokenAmount', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
             });
 
-            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountBefore).to.be.bignumber.equal(0);
 
-            const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
-            await exWrapper.fillOrderAsync(order, taker, { fillTakerTokenAmount });
+            const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
+            await exWrapper.fillOrderAsync(signedOrder, taker, { fillTakerTokenAmount });
 
-            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountAfter).to.be.bignumber.equal(fillTakerTokenAmount);
 
             const newBalances = await dmyBalances.getAsync();
 
             const fillMakerTokenAmount = fillTakerTokenAmount
-                .times(order.params.makerTokenAmount)
-                .dividedToIntegerBy(order.params.takerTokenAmount);
-            const paidMakerFee = order.params.makerFee
+                .times(signedOrder.makerTokenAmount)
+                .dividedToIntegerBy(signedOrder.takerTokenAmount);
+            const paidMakerFee = signedOrder.makerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            const paidTakerFee = order.params.takerFee
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            const paidTakerFee = signedOrder.takerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            expect(newBalances[maker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.makerToken].minus(fillMakerTokenAmount),
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            expect(newBalances[maker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.makerTokenAddress].minus(fillMakerTokenAmount),
             );
-            expect(newBalances[maker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.takerToken].add(fillTakerTokenAmount),
+            expect(newBalances[maker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.takerTokenAddress].add(fillTakerTokenAmount),
             );
             expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(
                 balances[maker][zrx.address].minus(paidMakerFee),
             );
-            expect(newBalances[taker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.takerToken].minus(fillTakerTokenAmount),
+            expect(newBalances[taker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.takerTokenAddress].minus(fillTakerTokenAmount),
             );
-            expect(newBalances[taker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.makerToken].add(fillMakerTokenAmount),
+            expect(newBalances[taker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.makerTokenAddress].add(fillMakerTokenAmount),
             );
             expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(
                 balances[taker][zrx.address].minus(paidTakerFee),
@@ -231,47 +236,49 @@ describe('Exchange', () => {
         });
 
         it('should transfer the correct amounts when makerTokenAmount > takerTokenAmount', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
             });
 
-            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountBefore).to.be.bignumber.equal(0);
 
-            const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
-            await exWrapper.fillOrderAsync(order, taker, { fillTakerTokenAmount });
+            const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
+            await exWrapper.fillOrderAsync(signedOrder, taker, { fillTakerTokenAmount });
 
-            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountAfter).to.be.bignumber.equal(fillTakerTokenAmount);
 
             const newBalances = await dmyBalances.getAsync();
 
             const fillMakerTokenAmount = fillTakerTokenAmount
-                .times(order.params.makerTokenAmount)
-                .dividedToIntegerBy(order.params.takerTokenAmount);
-            const paidMakerFee = order.params.makerFee
+                .times(signedOrder.makerTokenAmount)
+                .dividedToIntegerBy(signedOrder.takerTokenAmount);
+            const paidMakerFee = signedOrder.makerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            const paidTakerFee = order.params.takerFee
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            const paidTakerFee = signedOrder.takerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            expect(newBalances[maker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.makerToken].minus(fillMakerTokenAmount),
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            expect(newBalances[maker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.makerTokenAddress].minus(fillMakerTokenAmount),
             );
-            expect(newBalances[maker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.takerToken].add(fillTakerTokenAmount),
+            expect(newBalances[maker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.takerTokenAddress].add(fillTakerTokenAmount),
             );
             expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(
                 balances[maker][zrx.address].minus(paidMakerFee),
             );
-            expect(newBalances[taker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.takerToken].minus(fillTakerTokenAmount),
+            expect(newBalances[taker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.takerTokenAddress].minus(fillTakerTokenAmount),
             );
-            expect(newBalances[taker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.makerToken].add(fillMakerTokenAmount),
+            expect(newBalances[taker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.makerTokenAddress].add(fillMakerTokenAmount),
             );
             expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(
                 balances[taker][zrx.address].minus(paidTakerFee),
@@ -282,47 +289,49 @@ describe('Exchange', () => {
         });
 
         it('should transfer the correct amounts when makerTokenAmount < takerTokenAmount', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
             });
 
-            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountBefore).to.be.bignumber.equal(0);
 
-            const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
-            await exWrapper.fillOrderAsync(order, taker, { fillTakerTokenAmount });
+            const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
+            await exWrapper.fillOrderAsync(signedOrder, taker, { fillTakerTokenAmount });
 
-            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountAfter).to.be.bignumber.equal(fillTakerTokenAmount);
 
             const newBalances = await dmyBalances.getAsync();
 
             const fillMakerTokenAmount = fillTakerTokenAmount
-                .times(order.params.makerTokenAmount)
-                .dividedToIntegerBy(order.params.takerTokenAmount);
-            const paidMakerFee = order.params.makerFee
+                .times(signedOrder.makerTokenAmount)
+                .dividedToIntegerBy(signedOrder.takerTokenAmount);
+            const paidMakerFee = signedOrder.makerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            const paidTakerFee = order.params.takerFee
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            const paidTakerFee = signedOrder.takerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            expect(newBalances[maker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.makerToken].minus(fillMakerTokenAmount),
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            expect(newBalances[maker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.makerTokenAddress].minus(fillMakerTokenAmount),
             );
-            expect(newBalances[maker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.takerToken].add(fillTakerTokenAmount),
+            expect(newBalances[maker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.takerTokenAddress].add(fillTakerTokenAmount),
             );
             expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(
                 balances[maker][zrx.address].minus(paidMakerFee),
             );
-            expect(newBalances[taker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.takerToken].minus(fillTakerTokenAmount),
+            expect(newBalances[taker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.takerTokenAddress].minus(fillTakerTokenAmount),
             );
-            expect(newBalances[taker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.makerToken].add(fillMakerTokenAmount),
+            expect(newBalances[taker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.makerTokenAddress].add(fillMakerTokenAmount),
             );
             expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(
                 balances[taker][zrx.address].minus(paidTakerFee),
@@ -333,49 +342,51 @@ describe('Exchange', () => {
         });
 
         it('should transfer the correct amounts when taker is specified and order is claimed by taker', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 taker,
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
             });
 
-            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountBefore = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             expect(filledTakerTokenAmountBefore).to.be.bignumber.equal(0);
 
-            const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
-            await exWrapper.fillOrderAsync(order, taker, { fillTakerTokenAmount });
+            const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
+            await exWrapper.fillOrderAsync(signedOrder, taker, { fillTakerTokenAmount });
 
-            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(order.params
-                .orderHashHex as string);
+            const filledTakerTokenAmountAfter = await zeroEx.exchange.getFilledTakerAmountAsync(
+                ZeroEx.getOrderHashHex(signedOrder),
+            );
             const expectedFillAmountTAfter = fillTakerTokenAmount.add(filledTakerTokenAmountBefore);
             expect(filledTakerTokenAmountAfter).to.be.bignumber.equal(expectedFillAmountTAfter);
 
             const newBalances = await dmyBalances.getAsync();
 
             const fillMakerTokenAmount = fillTakerTokenAmount
-                .times(order.params.makerTokenAmount)
-                .dividedToIntegerBy(order.params.takerTokenAmount);
-            const paidMakerFee = order.params.makerFee
+                .times(signedOrder.makerTokenAmount)
+                .dividedToIntegerBy(signedOrder.takerTokenAmount);
+            const paidMakerFee = signedOrder.makerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            const paidTakerFee = order.params.takerFee
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            const paidTakerFee = signedOrder.takerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            expect(newBalances[maker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.makerToken].minus(fillMakerTokenAmount),
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            expect(newBalances[maker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.makerTokenAddress].minus(fillMakerTokenAmount),
             );
-            expect(newBalances[maker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.takerToken].add(fillTakerTokenAmount),
+            expect(newBalances[maker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.takerTokenAddress].add(fillTakerTokenAmount),
             );
             expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(
                 balances[maker][zrx.address].minus(paidMakerFee),
             );
-            expect(newBalances[taker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.takerToken].minus(fillTakerTokenAmount),
+            expect(newBalances[taker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.takerTokenAddress].minus(fillTakerTokenAmount),
             );
-            expect(newBalances[taker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.makerToken].add(fillMakerTokenAmount),
+            expect(newBalances[taker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.makerTokenAddress].add(fillMakerTokenAmount),
             );
             expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(
                 balances[taker][zrx.address].minus(paidTakerFee),
@@ -386,141 +397,141 @@ describe('Exchange', () => {
         });
 
         it('should fill remaining value if fillTakerTokenAmount > remaining takerTokenAmount', async () => {
-            const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
-            await exWrapper.fillOrderAsync(order, taker, { fillTakerTokenAmount });
+            const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
+            await exWrapper.fillOrderAsync(signedOrder, taker, { fillTakerTokenAmount });
 
-            const res = await exWrapper.fillOrderAsync(order, taker, {
-                fillTakerTokenAmount: order.params.takerTokenAmount,
+            const res = await exWrapper.fillOrderAsync(signedOrder, taker, {
+                fillTakerTokenAmount: signedOrder.takerTokenAmount,
             });
             const log = res.logs[0] as LogWithDecodedArgs<LogFillContractEventArgs>;
             expect(log.args.filledTakerTokenAmount).to.be.bignumber.equal(
-                order.params.takerTokenAmount.minus(fillTakerTokenAmount),
+                signedOrder.takerTokenAmount.minus(fillTakerTokenAmount),
             );
             const newBalances = await dmyBalances.getAsync();
 
-            expect(newBalances[maker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.makerToken].minus(order.params.makerTokenAmount),
+            expect(newBalances[maker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.makerTokenAddress].minus(signedOrder.makerTokenAmount),
             );
-            expect(newBalances[maker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.takerToken].add(order.params.takerTokenAmount),
+            expect(newBalances[maker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.takerTokenAddress].add(signedOrder.takerTokenAmount),
             );
             expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(
-                balances[maker][zrx.address].minus(order.params.makerFee),
+                balances[maker][zrx.address].minus(signedOrder.makerFee),
             );
-            expect(newBalances[taker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.takerToken].minus(order.params.takerTokenAmount),
+            expect(newBalances[taker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.takerTokenAddress].minus(signedOrder.takerTokenAmount),
             );
-            expect(newBalances[taker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.makerToken].add(order.params.makerTokenAmount),
+            expect(newBalances[taker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.makerTokenAddress].add(signedOrder.makerTokenAmount),
             );
             expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(
-                balances[taker][zrx.address].minus(order.params.takerFee),
+                balances[taker][zrx.address].minus(signedOrder.takerFee),
             );
             expect(newBalances[feeRecipient][zrx.address]).to.be.bignumber.equal(
-                balances[feeRecipient][zrx.address].add(order.params.makerFee.add(order.params.takerFee)),
+                balances[feeRecipient][zrx.address].add(signedOrder.makerFee.add(signedOrder.takerFee)),
             );
         });
 
         it('should log 1 event with the correct arguments when order has a feeRecipient', async () => {
             const divisor = 2;
-            const res = await exWrapper.fillOrderAsync(order, taker, {
-                fillTakerTokenAmount: order.params.takerTokenAmount.div(divisor),
+            const res = await exWrapper.fillOrderAsync(signedOrder, taker, {
+                fillTakerTokenAmount: signedOrder.takerTokenAmount.div(divisor),
             });
             expect(res.logs).to.have.length(1);
 
             const logArgs = (res.logs[0] as LogWithDecodedArgs<LogFillContractEventArgs>).args;
-            const expectedFilledMakerTokenAmount = order.params.makerTokenAmount.div(divisor);
-            const expectedFilledTakerTokenAmount = order.params.takerTokenAmount.div(divisor);
-            const expectedFeeMPaid = order.params.makerFee.div(divisor);
-            const expectedFeeTPaid = order.params.takerFee.div(divisor);
-            const tokensHashBuff = crypto.solSHA3([order.params.makerToken, order.params.takerToken]);
+            const expectedFilledMakerTokenAmount = signedOrder.makerTokenAmount.div(divisor);
+            const expectedFilledTakerTokenAmount = signedOrder.takerTokenAmount.div(divisor);
+            const expectedFeeMPaid = signedOrder.makerFee.div(divisor);
+            const expectedFeeTPaid = signedOrder.takerFee.div(divisor);
+            const tokensHashBuff = crypto.solSHA3([signedOrder.makerTokenAddress, signedOrder.takerTokenAddress]);
             const expectedTokens = ethUtil.bufferToHex(tokensHashBuff);
 
-            expect(order.params.maker).to.be.equal(logArgs.maker);
+            expect(signedOrder.maker).to.be.equal(logArgs.maker);
             expect(taker).to.be.equal(logArgs.taker);
-            expect(order.params.feeRecipient).to.be.equal(logArgs.feeRecipient);
-            expect(order.params.makerToken).to.be.equal(logArgs.makerToken);
-            expect(order.params.takerToken).to.be.equal(logArgs.takerToken);
+            expect(signedOrder.feeRecipient).to.be.equal(logArgs.feeRecipient);
+            expect(signedOrder.makerTokenAddress).to.be.equal(logArgs.makerToken);
+            expect(signedOrder.takerTokenAddress).to.be.equal(logArgs.takerToken);
             expect(expectedFilledMakerTokenAmount).to.be.bignumber.equal(logArgs.filledMakerTokenAmount);
             expect(expectedFilledTakerTokenAmount).to.be.bignumber.equal(logArgs.filledTakerTokenAmount);
             expect(expectedFeeMPaid).to.be.bignumber.equal(logArgs.paidMakerFee);
             expect(expectedFeeTPaid).to.be.bignumber.equal(logArgs.paidTakerFee);
             expect(expectedTokens).to.be.equal(logArgs.tokens);
-            expect(order.params.orderHashHex).to.be.equal(logArgs.orderHash);
+            expect(ZeroEx.getOrderHashHex(signedOrder)).to.be.equal(logArgs.orderHash);
         });
 
         it('should log 1 event with the correct arguments when order has no feeRecipient', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 feeRecipient: ZeroEx.NULL_ADDRESS,
             });
             const divisor = 2;
-            const res = await exWrapper.fillOrderAsync(order, taker, {
-                fillTakerTokenAmount: order.params.takerTokenAmount.div(divisor),
+            const res = await exWrapper.fillOrderAsync(signedOrder, taker, {
+                fillTakerTokenAmount: signedOrder.takerTokenAmount.div(divisor),
             });
             expect(res.logs).to.have.length(1);
 
             const logArgs = (res.logs[0] as LogWithDecodedArgs<LogFillContractEventArgs>).args;
-            const expectedFilledMakerTokenAmount = order.params.makerTokenAmount.div(divisor);
-            const expectedFilledTakerTokenAmount = order.params.takerTokenAmount.div(divisor);
+            const expectedFilledMakerTokenAmount = signedOrder.makerTokenAmount.div(divisor);
+            const expectedFilledTakerTokenAmount = signedOrder.takerTokenAmount.div(divisor);
             const expectedFeeMPaid = new BigNumber(0);
             const expectedFeeTPaid = new BigNumber(0);
-            const tokensHashBuff = crypto.solSHA3([order.params.makerToken, order.params.takerToken]);
+            const tokensHashBuff = crypto.solSHA3([signedOrder.makerTokenAddress, signedOrder.takerTokenAddress]);
             const expectedTokens = ethUtil.bufferToHex(tokensHashBuff);
 
-            expect(order.params.maker).to.be.equal(logArgs.maker);
+            expect(signedOrder.maker).to.be.equal(logArgs.maker);
             expect(taker).to.be.equal(logArgs.taker);
-            expect(order.params.feeRecipient).to.be.equal(logArgs.feeRecipient);
-            expect(order.params.makerToken).to.be.equal(logArgs.makerToken);
-            expect(order.params.takerToken).to.be.equal(logArgs.takerToken);
+            expect(signedOrder.feeRecipient).to.be.equal(logArgs.feeRecipient);
+            expect(signedOrder.makerTokenAddress).to.be.equal(logArgs.makerToken);
+            expect(signedOrder.takerTokenAddress).to.be.equal(logArgs.takerToken);
             expect(expectedFilledMakerTokenAmount).to.be.bignumber.equal(logArgs.filledMakerTokenAmount);
             expect(expectedFilledTakerTokenAmount).to.be.bignumber.equal(logArgs.filledTakerTokenAmount);
             expect(expectedFeeMPaid).to.be.bignumber.equal(logArgs.paidMakerFee);
             expect(expectedFeeTPaid).to.be.bignumber.equal(logArgs.paidTakerFee);
             expect(expectedTokens).to.be.equal(logArgs.tokens);
-            expect(order.params.orderHashHex).to.be.equal(logArgs.orderHash);
+            expect(ZeroEx.getOrderHashHex(signedOrder)).to.be.equal(logArgs.orderHash);
         });
 
         it('should throw when taker is specified and order is claimed by other', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 taker: feeRecipient,
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
             });
 
-            return expect(exWrapper.fillOrderAsync(order, taker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.fillOrderAsync(signedOrder, taker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if signature is invalid', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
             });
 
-            order.params.r = ethUtil.bufferToHex(ethUtil.sha3('invalidR'));
-            order.params.s = ethUtil.bufferToHex(ethUtil.sha3('invalidS'));
-            return expect(exWrapper.fillOrderAsync(order, taker)).to.be.rejectedWith(constants.REVERT);
+            signedOrder.ecSignature.r = ethUtil.bufferToHex(ethUtil.sha3('invalidR'));
+            signedOrder.ecSignature.s = ethUtil.bufferToHex(ethUtil.sha3('invalidS'));
+            return expect(exWrapper.fillOrderAsync(signedOrder, taker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if makerTokenAmount is 0', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: new BigNumber(0),
             });
 
-            return expect(exWrapper.fillOrderAsync(order, taker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.fillOrderAsync(signedOrder, taker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if takerTokenAmount is 0', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 takerTokenAmount: new BigNumber(0),
             });
 
-            return expect(exWrapper.fillOrderAsync(order, taker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.fillOrderAsync(signedOrder, taker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if fillTakerTokenAmount is 0', async () => {
-            order = await orderFactory.newSignedOrderAsync();
+            signedOrder = await orderFactory.newSignedOrderAsync();
 
             return expect(
-                exWrapper.fillOrderAsync(order, taker, {
+                exWrapper.fillOrderAsync(signedOrder, taker, {
                     fillTakerTokenAmount: new BigNumber(0),
                 }),
             ).to.be.rejectedWith(constants.REVERT);
@@ -528,23 +539,23 @@ describe('Exchange', () => {
 
         it('should not change balances if maker balances are too low to fill order and \
                 shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             const newBalances = await dmyBalances.getAsync();
             expect(newBalances).to.be.deep.equal(balances);
         });
 
         it('should throw if maker balances are too low to fill order and \
                 shouldThrowOnInsufficientBalanceOrAllowance = true', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
             return expect(
-                exWrapper.fillOrderAsync(order, taker, {
+                exWrapper.fillOrderAsync(signedOrder, taker, {
                     shouldThrowOnInsufficientBalanceOrAllowance: true,
                 }),
             ).to.be.rejectedWith(constants.REVERT);
@@ -552,23 +563,23 @@ describe('Exchange', () => {
 
         it('should not change balances if taker balances are too low to fill order and \
                 shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             const newBalances = await dmyBalances.getAsync();
             expect(newBalances).to.be.deep.equal(balances);
         });
 
         it('should throw if taker balances are too low to fill order and \
                 shouldThrowOnInsufficientBalanceOrAllowance = true', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
             return expect(
-                exWrapper.fillOrderAsync(order, taker, {
+                exWrapper.fillOrderAsync(signedOrder, taker, {
                     shouldThrowOnInsufficientBalanceOrAllowance: true,
                 }),
             ).to.be.rejectedWith(constants.REVERT);
@@ -577,7 +588,7 @@ describe('Exchange', () => {
         it('should not change balances if maker allowances are too low to fill order and \
                 shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
             await rep.approve.sendTransactionAsync(tokenTransferProxy.address, new BigNumber(0), { from: maker });
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             await rep.approve.sendTransactionAsync(tokenTransferProxy.address, INITIAL_ALLOWANCE, {
                 from: maker,
             });
@@ -590,7 +601,7 @@ describe('Exchange', () => {
                 shouldThrowOnInsufficientBalanceOrAllowance = true', async () => {
             await rep.approve.sendTransactionAsync(tokenTransferProxy.address, new BigNumber(0), { from: maker });
             expect(
-                exWrapper.fillOrderAsync(order, taker, {
+                exWrapper.fillOrderAsync(signedOrder, taker, {
                     shouldThrowOnInsufficientBalanceOrAllowance: true,
                 }),
             ).to.be.rejectedWith(constants.REVERT);
@@ -602,7 +613,7 @@ describe('Exchange', () => {
         it('should not change balances if taker allowances are too low to fill order and \
                 shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
             await dgd.approve.sendTransactionAsync(tokenTransferProxy.address, new BigNumber(0), { from: taker });
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             await dgd.approve.sendTransactionAsync(tokenTransferProxy.address, INITIAL_ALLOWANCE, {
                 from: taker,
             });
@@ -615,7 +626,7 @@ describe('Exchange', () => {
                 shouldThrowOnInsufficientBalanceOrAllowance = true', async () => {
             await dgd.approve.sendTransactionAsync(tokenTransferProxy.address, new BigNumber(0), { from: taker });
             expect(
-                exWrapper.fillOrderAsync(order, taker, {
+                exWrapper.fillOrderAsync(signedOrder, taker, {
                     shouldThrowOnInsufficientBalanceOrAllowance: true,
                 }),
             ).to.be.rejectedWith(constants.REVERT);
@@ -624,54 +635,54 @@ describe('Exchange', () => {
             });
         });
 
-        it('should not change balances if makerToken is ZRX, makerTokenAmount + makerFee > maker balance, \
+        it('should not change balances if makerTokenAddress is ZRX, makerTokenAmount + makerFee > maker balance, \
                 and shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
             const makerZRXBalance = new BigNumber(balances[maker][zrx.address]);
-            order = await orderFactory.newSignedOrderAsync({
-                makerToken: zrx.address,
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                makerTokenAddress: zrx.address,
                 makerTokenAmount: makerZRXBalance,
                 makerFee: new BigNumber(1),
             });
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             const newBalances = await dmyBalances.getAsync();
             expect(newBalances).to.be.deep.equal(balances);
         });
 
-        it('should not change balances if makerToken is ZRX, makerTokenAmount + makerFee > maker allowance, \
+        it('should not change balances if makerTokenAddress is ZRX, makerTokenAmount + makerFee > maker allowance, \
                 and shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
             const makerZRXAllowance = await zrx.allowance(maker, tokenTransferProxy.address);
-            order = await orderFactory.newSignedOrderAsync({
-                makerToken: zrx.address,
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                makerTokenAddress: zrx.address,
                 makerTokenAmount: new BigNumber(makerZRXAllowance),
                 makerFee: new BigNumber(1),
             });
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             const newBalances = await dmyBalances.getAsync();
             expect(newBalances).to.be.deep.equal(balances);
         });
 
-        it('should not change balances if takerToken is ZRX, takerTokenAmount + takerFee > taker balance, \
+        it('should not change balances if takerTokenAddress is ZRX, takerTokenAmount + takerFee > taker balance, \
                 and shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
             const takerZRXBalance = new BigNumber(balances[taker][zrx.address]);
-            order = await orderFactory.newSignedOrderAsync({
-                takerToken: zrx.address,
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                takerTokenAddress: zrx.address,
                 takerTokenAmount: takerZRXBalance,
                 takerFee: new BigNumber(1),
             });
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             const newBalances = await dmyBalances.getAsync();
             expect(newBalances).to.be.deep.equal(balances);
         });
 
-        it('should not change balances if takerToken is ZRX, takerTokenAmount + takerFee > taker allowance, \
+        it('should not change balances if takerTokenAddress is ZRX, takerTokenAmount + takerFee > taker allowance, \
                 and shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
             const takerZRXAllowance = await zrx.allowance(taker, tokenTransferProxy.address);
-            order = await orderFactory.newSignedOrderAsync({
-                takerToken: zrx.address,
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                takerTokenAddress: zrx.address,
                 takerTokenAmount: new BigNumber(takerZRXAllowance),
                 takerFee: new BigNumber(1),
             });
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
             const newBalances = await dmyBalances.getAsync();
             expect(newBalances).to.be.deep.equal(balances);
         });
@@ -683,33 +694,33 @@ describe('Exchange', () => {
                 from: taker,
             });
 
-            order = await orderFactory.newSignedOrderAsync({
-                takerToken: maliciousToken.address,
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                takerTokenAddress: maliciousToken.address,
             });
 
             return expect(
-                exWrapper.fillOrderAsync(order, taker, {
+                exWrapper.fillOrderAsync(signedOrder, taker, {
                     shouldThrowOnInsufficientBalanceOrAllowance: false,
                 }),
             ).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should not change balances if an order is expired', async () => {
-            order = await orderFactory.newSignedOrderAsync({
-                expirationTimestampInSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                expirationUnixTimestampSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
             });
-            await exWrapper.fillOrderAsync(order, taker);
+            await exWrapper.fillOrderAsync(signedOrder, taker);
 
             const newBalances = await dmyBalances.getAsync();
             expect(newBalances).to.be.deep.equal(balances);
         });
 
         it('should log an error event if an order is expired', async () => {
-            order = await orderFactory.newSignedOrderAsync({
-                expirationTimestampInSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                expirationUnixTimestampSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
             });
 
-            const res = await exWrapper.fillOrderAsync(order, taker);
+            const res = await exWrapper.fillOrderAsync(signedOrder, taker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
             const errCode = log.args.errorId.toNumber();
@@ -717,10 +728,10 @@ describe('Exchange', () => {
         });
 
         it('should log an error event if no value is filled', async () => {
-            order = await orderFactory.newSignedOrderAsync({});
-            await exWrapper.fillOrderAsync(order, taker);
+            signedOrder = await orderFactory.newSignedOrderAsync({});
+            await exWrapper.fillOrderAsync(signedOrder, taker);
 
-            const res = await exWrapper.fillOrderAsync(order, taker);
+            const res = await exWrapper.fillOrderAsync(signedOrder, taker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
             const errCode = log.args.errorId.toNumber();
@@ -731,43 +742,43 @@ describe('Exchange', () => {
     describe('cancelOrder', () => {
         beforeEach(async () => {
             balances = await dmyBalances.getAsync();
-            order = await orderFactory.newSignedOrderAsync();
+            signedOrder = await orderFactory.newSignedOrderAsync();
         });
 
         it('should throw if not sent by maker', async () => {
-            return expect(exWrapper.cancelOrderAsync(order, taker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.cancelOrderAsync(signedOrder, taker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if makerTokenAmount is 0', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: new BigNumber(0),
             });
 
-            return expect(exWrapper.cancelOrderAsync(order, maker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.cancelOrderAsync(signedOrder, maker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if takerTokenAmount is 0', async () => {
-            order = await orderFactory.newSignedOrderAsync({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 takerTokenAmount: new BigNumber(0),
             });
 
-            return expect(exWrapper.cancelOrderAsync(order, maker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.cancelOrderAsync(signedOrder, maker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if cancelTakerTokenAmount is 0', async () => {
-            order = await orderFactory.newSignedOrderAsync();
+            signedOrder = await orderFactory.newSignedOrderAsync();
 
             return expect(
-                exWrapper.cancelOrderAsync(order, maker, {
+                exWrapper.cancelOrderAsync(signedOrder, maker, {
                     cancelTakerTokenAmount: new BigNumber(0),
                 }),
             ).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should be able to cancel a full order', async () => {
-            await exWrapper.cancelOrderAsync(order, maker);
-            await exWrapper.fillOrderAsync(order, taker, {
-                fillTakerTokenAmount: order.params.takerTokenAmount.div(2),
+            await exWrapper.cancelOrderAsync(signedOrder, maker);
+            await exWrapper.fillOrderAsync(signedOrder, taker, {
+                fillTakerTokenAmount: signedOrder.takerTokenAmount.div(2),
             });
 
             const newBalances = await dmyBalances.getAsync();
@@ -775,43 +786,43 @@ describe('Exchange', () => {
         });
 
         it('should be able to cancel part of an order', async () => {
-            const cancelTakerTokenAmount = order.params.takerTokenAmount.div(2);
-            await exWrapper.cancelOrderAsync(order, maker, {
+            const cancelTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
+            await exWrapper.cancelOrderAsync(signedOrder, maker, {
                 cancelTakerTokenAmount,
             });
 
-            const res = await exWrapper.fillOrderAsync(order, taker, {
-                fillTakerTokenAmount: order.params.takerTokenAmount,
+            const res = await exWrapper.fillOrderAsync(signedOrder, taker, {
+                fillTakerTokenAmount: signedOrder.takerTokenAmount,
             });
             const log = res.logs[0] as LogWithDecodedArgs<LogFillContractEventArgs>;
             expect(log.args.filledTakerTokenAmount).to.be.bignumber.equal(
-                order.params.takerTokenAmount.minus(cancelTakerTokenAmount),
+                signedOrder.takerTokenAmount.minus(cancelTakerTokenAmount),
             );
 
             const newBalances = await dmyBalances.getAsync();
             const cancelMakerTokenAmount = cancelTakerTokenAmount
-                .times(order.params.makerTokenAmount)
-                .dividedToIntegerBy(order.params.takerTokenAmount);
-            const paidMakerFee = order.params.makerFee
+                .times(signedOrder.makerTokenAmount)
+                .dividedToIntegerBy(signedOrder.takerTokenAmount);
+            const paidMakerFee = signedOrder.makerFee
                 .times(cancelMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            const paidTakerFee = order.params.takerFee
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            const paidTakerFee = signedOrder.takerFee
                 .times(cancelMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            expect(newBalances[maker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.makerToken].minus(cancelMakerTokenAmount),
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            expect(newBalances[maker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.makerTokenAddress].minus(cancelMakerTokenAmount),
             );
-            expect(newBalances[maker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.takerToken].add(cancelTakerTokenAmount),
+            expect(newBalances[maker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.takerTokenAddress].add(cancelTakerTokenAmount),
             );
             expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(
                 balances[maker][zrx.address].minus(paidMakerFee),
             );
-            expect(newBalances[taker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.takerToken].minus(cancelTakerTokenAmount),
+            expect(newBalances[taker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.takerTokenAddress].minus(cancelTakerTokenAmount),
             );
-            expect(newBalances[taker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.makerToken].add(cancelMakerTokenAmount),
+            expect(newBalances[taker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.makerTokenAddress].add(cancelMakerTokenAmount),
             );
             expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(
                 balances[taker][zrx.address].minus(paidTakerFee),
@@ -823,32 +834,32 @@ describe('Exchange', () => {
 
         it('should log 1 event with correct arguments', async () => {
             const divisor = 2;
-            const res = await exWrapper.cancelOrderAsync(order, maker, {
-                cancelTakerTokenAmount: order.params.takerTokenAmount.div(divisor),
+            const res = await exWrapper.cancelOrderAsync(signedOrder, maker, {
+                cancelTakerTokenAmount: signedOrder.takerTokenAmount.div(divisor),
             });
             expect(res.logs).to.have.length(1);
 
             const log = res.logs[0] as LogWithDecodedArgs<LogCancelContractEventArgs>;
             const logArgs = log.args;
-            const expectedCancelledMakerTokenAmount = order.params.makerTokenAmount.div(divisor);
-            const expectedCancelledTakerTokenAmount = order.params.takerTokenAmount.div(divisor);
-            const tokensHashBuff = crypto.solSHA3([order.params.makerToken, order.params.takerToken]);
+            const expectedCancelledMakerTokenAmount = signedOrder.makerTokenAmount.div(divisor);
+            const expectedCancelledTakerTokenAmount = signedOrder.takerTokenAmount.div(divisor);
+            const tokensHashBuff = crypto.solSHA3([signedOrder.makerTokenAddress, signedOrder.takerTokenAddress]);
             const expectedTokens = ethUtil.bufferToHex(tokensHashBuff);
 
-            expect(order.params.maker).to.be.equal(logArgs.maker);
-            expect(order.params.feeRecipient).to.be.equal(logArgs.feeRecipient);
-            expect(order.params.makerToken).to.be.equal(logArgs.makerToken);
-            expect(order.params.takerToken).to.be.equal(logArgs.takerToken);
+            expect(signedOrder.maker).to.be.equal(logArgs.maker);
+            expect(signedOrder.feeRecipient).to.be.equal(logArgs.feeRecipient);
+            expect(signedOrder.makerTokenAddress).to.be.equal(logArgs.makerToken);
+            expect(signedOrder.takerTokenAddress).to.be.equal(logArgs.takerToken);
             expect(expectedCancelledMakerTokenAmount).to.be.bignumber.equal(logArgs.cancelledMakerTokenAmount);
             expect(expectedCancelledTakerTokenAmount).to.be.bignumber.equal(logArgs.cancelledTakerTokenAmount);
             expect(expectedTokens).to.be.equal(logArgs.tokens);
-            expect(order.params.orderHashHex).to.be.equal(logArgs.orderHash);
+            expect(ZeroEx.getOrderHashHex(signedOrder)).to.be.equal(logArgs.orderHash);
         });
 
         it('should not log events if no value is cancelled', async () => {
-            await exWrapper.cancelOrderAsync(order, maker);
+            await exWrapper.cancelOrderAsync(signedOrder, maker);
 
-            const res = await exWrapper.cancelOrderAsync(order, maker);
+            const res = await exWrapper.cancelOrderAsync(signedOrder, maker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
             const errCode = log.args.errorId.toNumber();
@@ -856,11 +867,11 @@ describe('Exchange', () => {
         });
 
         it('should not log events if order is expired', async () => {
-            order = await orderFactory.newSignedOrderAsync({
-                expirationTimestampInSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                expirationUnixTimestampSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
             });
 
-            const res = await exWrapper.cancelOrderAsync(order, maker);
+            const res = await exWrapper.cancelOrderAsync(signedOrder, maker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
             const errCode = log.args.errorId.toNumber();
diff --git a/packages/contracts/test/exchange/helpers.ts b/packages/contracts/test/exchange/helpers.ts
index 33bf8b803..5fe00225e 100644
--- a/packages/contracts/test/exchange/helpers.ts
+++ b/packages/contracts/test/exchange/helpers.ts
@@ -1,4 +1,4 @@
-import { ZeroEx } from '0x.js';
+import { SignedOrder, ZeroEx } from '0x.js';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -8,7 +8,6 @@ import ethUtil = require('ethereumjs-util');
 import { ExchangeContract } from '../../src/contract_wrappers/generated/exchange';
 import { constants } from '../../util/constants';
 import { ExchangeWrapper } from '../../util/exchange_wrapper';
-import { Order } from '../../util/order';
 import { OrderFactory } from '../../util/order_factory';
 import { ContractName } from '../../util/types';
 import { chaiSetup } from '../utils/chai_setup';
@@ -25,7 +24,7 @@ describe('Exchange', () => {
     let maker: string;
     let feeRecipient: string;
 
-    let order: Order;
+    let signedOrder: SignedOrder;
     let exchangeWrapper: ExchangeWrapper;
     let orderFactory: OrderFactory;
 
@@ -58,8 +57,8 @@ describe('Exchange', () => {
             makerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
             takerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
         };
-        orderFactory = new OrderFactory(web3Wrapper, defaultOrderParams);
-        order = await orderFactory.newSignedOrderAsync();
+        orderFactory = new OrderFactory(zeroEx, defaultOrderParams);
+        signedOrder = await orderFactory.newSignedOrderAsync();
     });
 
     beforeEach(async () => {
@@ -70,28 +69,31 @@ describe('Exchange', () => {
     });
     describe('getOrderHash', () => {
         it('should output the correct orderHash', async () => {
-            const orderHashHex = await exchangeWrapper.getOrderHashAsync(order);
-            expect(order.params.orderHashHex).to.be.equal(orderHashHex);
+            const orderHashHex = await exchangeWrapper.getOrderHashAsync(signedOrder);
+            expect(ZeroEx.getOrderHashHex(signedOrder)).to.be.equal(orderHashHex);
         });
     });
 
     describe('isValidSignature', () => {
         beforeEach(async () => {
-            order = await orderFactory.newSignedOrderAsync();
+            signedOrder = await orderFactory.newSignedOrderAsync();
         });
 
         it('should return true with a valid signature', async () => {
-            const success = await exchangeWrapper.isValidSignatureAsync(order);
-            const isValidSignature = order.isValidSignature();
+            const success = await exchangeWrapper.isValidSignatureAsync(signedOrder);
+            const orderHashHex = ZeroEx.getOrderHashHex(signedOrder);
+            const isValidSignature = ZeroEx.isValidSignature(orderHashHex, signedOrder.ecSignature, signedOrder.maker);
             expect(isValidSignature).to.be.true();
             expect(success).to.be.true();
         });
 
         it('should return false with an invalid signature', async () => {
-            order.params.r = ethUtil.bufferToHex(ethUtil.sha3('invalidR'));
-            order.params.s = ethUtil.bufferToHex(ethUtil.sha3('invalidS'));
-            const success = await exchangeWrapper.isValidSignatureAsync(order);
-            expect(order.isValidSignature()).to.be.false();
+            signedOrder.ecSignature.r = ethUtil.bufferToHex(ethUtil.sha3('invalidR'));
+            signedOrder.ecSignature.s = ethUtil.bufferToHex(ethUtil.sha3('invalidS'));
+            const success = await exchangeWrapper.isValidSignatureAsync(signedOrder);
+            const orderHashHex = ZeroEx.getOrderHashHex(signedOrder);
+            const isValidSignature = ZeroEx.isValidSignature(orderHashHex, signedOrder.ecSignature, signedOrder.maker);
+            expect(isValidSignature).to.be.false();
             expect(success).to.be.false();
         });
     });
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index b1851a55c..bf5a89222 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -1,4 +1,4 @@
-import { ZeroEx } from '0x.js';
+import { SignedOrder, ZeroEx } from '0x.js';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -13,7 +13,6 @@ import { TokenTransferProxyContract } from '../../src/contract_wrappers/generate
 import { Balances } from '../../util/balances';
 import { constants } from '../../util/constants';
 import { ExchangeWrapper } from '../../util/exchange_wrapper';
-import { Order } from '../../util/order';
 import { OrderFactory } from '../../util/order_factory';
 import { BalancesByOwner, ContractName } from '../../util/types';
 import { chaiSetup } from '../utils/chai_setup';
@@ -76,15 +75,15 @@ describe('Exchange', () => {
             exchangeContractAddress: exchange.address,
             maker,
             feeRecipient,
-            makerToken: rep.address,
-            takerToken: dgd.address,
+            makerTokenAddress: rep.address,
+            takerTokenAddress: dgd.address,
             makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
             takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
             makerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
             takerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
         };
 
-        orderFactory = new OrderFactory(web3Wrapper, defaultOrderParams);
+        orderFactory = new OrderFactory(zeroEx, defaultOrderParams);
         dmyBalances = new Balances([rep, dgd, zrx], [maker, taker, feeRecipient]);
         await Promise.all([
             rep.approve.sendTransactionAsync(tokenTransferProxy.address, INIT_ALLOW, { from: maker }),
@@ -113,38 +112,38 @@ describe('Exchange', () => {
         });
 
         it('should transfer the correct amounts', async () => {
-            const order = await orderFactory.newSignedOrderAsync({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
                 takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
             });
-            const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
-            await exWrapper.fillOrKillOrderAsync(order, taker, {
+            const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
+            await exWrapper.fillOrKillOrderAsync(signedOrder, taker, {
                 fillTakerTokenAmount,
             });
 
             const newBalances = await dmyBalances.getAsync();
 
             const fillMakerTokenAmount = fillTakerTokenAmount
-                .times(order.params.makerTokenAmount)
-                .dividedToIntegerBy(order.params.takerTokenAmount);
-            const makerFee = order.params.makerFee
+                .times(signedOrder.makerTokenAmount)
+                .dividedToIntegerBy(signedOrder.takerTokenAmount);
+            const makerFee = signedOrder.makerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            const takerFee = order.params.takerFee
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            const takerFee = signedOrder.takerFee
                 .times(fillMakerTokenAmount)
-                .dividedToIntegerBy(order.params.makerTokenAmount);
-            expect(newBalances[maker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.makerToken].minus(fillMakerTokenAmount),
+                .dividedToIntegerBy(signedOrder.makerTokenAmount);
+            expect(newBalances[maker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.makerTokenAddress].minus(fillMakerTokenAmount),
             );
-            expect(newBalances[maker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[maker][order.params.takerToken].add(fillTakerTokenAmount),
+            expect(newBalances[maker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[maker][signedOrder.takerTokenAddress].add(fillTakerTokenAmount),
             );
             expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(balances[maker][zrx.address].minus(makerFee));
-            expect(newBalances[taker][order.params.takerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.takerToken].minus(fillTakerTokenAmount),
+            expect(newBalances[taker][signedOrder.takerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.takerTokenAddress].minus(fillTakerTokenAmount),
             );
-            expect(newBalances[taker][order.params.makerToken]).to.be.bignumber.equal(
-                balances[taker][order.params.makerToken].add(fillMakerTokenAmount),
+            expect(newBalances[taker][signedOrder.makerTokenAddress]).to.be.bignumber.equal(
+                balances[taker][signedOrder.makerTokenAddress].add(fillMakerTokenAmount),
             );
             expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(balances[taker][zrx.address].minus(takerFee));
             expect(newBalances[feeRecipient][zrx.address]).to.be.bignumber.equal(
@@ -152,30 +151,30 @@ describe('Exchange', () => {
             );
         });
 
-        it('should throw if an order is expired', async () => {
-            const order = await orderFactory.newSignedOrderAsync({
-                expirationTimestampInSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
+        it('should throw if an signedOrder is expired', async () => {
+            const signedOrder = await orderFactory.newSignedOrderAsync({
+                expirationUnixTimestampSec: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
             });
 
-            return expect(exWrapper.fillOrKillOrderAsync(order, taker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.fillOrKillOrderAsync(signedOrder, taker)).to.be.rejectedWith(constants.REVERT);
         });
 
         it('should throw if entire fillTakerTokenAmount not filled', async () => {
-            const order = await orderFactory.newSignedOrderAsync();
+            const signedOrder = await orderFactory.newSignedOrderAsync();
 
             const from = taker;
-            await exWrapper.fillOrderAsync(order, from, {
-                fillTakerTokenAmount: order.params.takerTokenAmount.div(2),
+            await exWrapper.fillOrderAsync(signedOrder, from, {
+                fillTakerTokenAmount: signedOrder.takerTokenAmount.div(2),
             });
 
-            return expect(exWrapper.fillOrKillOrderAsync(order, taker)).to.be.rejectedWith(constants.REVERT);
+            return expect(exWrapper.fillOrKillOrderAsync(signedOrder, taker)).to.be.rejectedWith(constants.REVERT);
         });
     });
 
     describe('batch functions', () => {
-        let orders: Order[];
+        let signedOrders: SignedOrder[];
         beforeEach(async () => {
-            orders = await Promise.all([
+            signedOrders = await Promise.all([
                 orderFactory.newSignedOrderAsync(),
                 orderFactory.newSignedOrderAsync(),
                 orderFactory.newSignedOrderAsync(),
@@ -186,32 +185,32 @@ describe('Exchange', () => {
         describe('batchFillOrders', () => {
             it('should transfer the correct amounts', async () => {
                 const fillTakerTokenAmounts: BigNumber[] = [];
-                const makerToken = rep.address;
-                const takerToken = dgd.address;
-                orders.forEach(order => {
-                    const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
+                const makerTokenAddress = rep.address;
+                const takerTokenAddress = dgd.address;
+                signedOrders.forEach(signedOrder => {
+                    const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
                     const fillMakerTokenAmount = fillTakerTokenAmount
-                        .times(order.params.makerTokenAmount)
-                        .dividedToIntegerBy(order.params.takerTokenAmount);
-                    const makerFee = order.params.makerFee
+                        .times(signedOrder.makerTokenAmount)
+                        .dividedToIntegerBy(signedOrder.takerTokenAmount);
+                    const makerFee = signedOrder.makerFee
                         .times(fillMakerTokenAmount)
-                        .dividedToIntegerBy(order.params.makerTokenAmount);
-                    const takerFee = order.params.takerFee
+                        .dividedToIntegerBy(signedOrder.makerTokenAmount);
+                    const takerFee = signedOrder.takerFee
                         .times(fillMakerTokenAmount)
-                        .dividedToIntegerBy(order.params.makerTokenAmount);
+                        .dividedToIntegerBy(signedOrder.makerTokenAmount);
                     fillTakerTokenAmounts.push(fillTakerTokenAmount);
-                    balances[maker][makerToken] = balances[maker][makerToken].minus(fillMakerTokenAmount);
-                    balances[maker][takerToken] = balances[maker][takerToken].add(fillTakerTokenAmount);
+                    balances[maker][makerTokenAddress] = balances[maker][makerTokenAddress].minus(fillMakerTokenAmount);
+                    balances[maker][takerTokenAddress] = balances[maker][takerTokenAddress].add(fillTakerTokenAmount);
                     balances[maker][zrx.address] = balances[maker][zrx.address].minus(makerFee);
-                    balances[taker][makerToken] = balances[taker][makerToken].add(fillMakerTokenAmount);
-                    balances[taker][takerToken] = balances[taker][takerToken].minus(fillTakerTokenAmount);
+                    balances[taker][makerTokenAddress] = balances[taker][makerTokenAddress].add(fillMakerTokenAmount);
+                    balances[taker][takerTokenAddress] = balances[taker][takerTokenAddress].minus(fillTakerTokenAmount);
                     balances[taker][zrx.address] = balances[taker][zrx.address].minus(takerFee);
                     balances[feeRecipient][zrx.address] = balances[feeRecipient][zrx.address].add(
                         makerFee.add(takerFee),
                     );
                 });
 
-                await exWrapper.batchFillOrdersAsync(orders, taker, {
+                await exWrapper.batchFillOrdersAsync(signedOrders, taker, {
                     fillTakerTokenAmounts,
                 });
 
@@ -223,32 +222,32 @@ describe('Exchange', () => {
         describe('batchFillOrKillOrders', () => {
             it('should transfer the correct amounts', async () => {
                 const fillTakerTokenAmounts: BigNumber[] = [];
-                const makerToken = rep.address;
-                const takerToken = dgd.address;
-                orders.forEach(order => {
-                    const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
+                const makerTokenAddress = rep.address;
+                const takerTokenAddress = dgd.address;
+                signedOrders.forEach(signedOrder => {
+                    const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
                     const fillMakerTokenAmount = fillTakerTokenAmount
-                        .times(order.params.makerTokenAmount)
-                        .dividedToIntegerBy(order.params.takerTokenAmount);
-                    const makerFee = order.params.makerFee
+                        .times(signedOrder.makerTokenAmount)
+                        .dividedToIntegerBy(signedOrder.takerTokenAmount);
+                    const makerFee = signedOrder.makerFee
                         .times(fillMakerTokenAmount)
-                        .dividedToIntegerBy(order.params.makerTokenAmount);
-                    const takerFee = order.params.takerFee
+                        .dividedToIntegerBy(signedOrder.makerTokenAmount);
+                    const takerFee = signedOrder.takerFee
                         .times(fillMakerTokenAmount)
-                        .dividedToIntegerBy(order.params.makerTokenAmount);
+                        .dividedToIntegerBy(signedOrder.makerTokenAmount);
                     fillTakerTokenAmounts.push(fillTakerTokenAmount);
-                    balances[maker][makerToken] = balances[maker][makerToken].minus(fillMakerTokenAmount);
-                    balances[maker][takerToken] = balances[maker][takerToken].add(fillTakerTokenAmount);
+                    balances[maker][makerTokenAddress] = balances[maker][makerTokenAddress].minus(fillMakerTokenAmount);
+                    balances[maker][takerTokenAddress] = balances[maker][takerTokenAddress].add(fillTakerTokenAmount);
                     balances[maker][zrx.address] = balances[maker][zrx.address].minus(makerFee);
-                    balances[taker][makerToken] = balances[taker][makerToken].add(fillMakerTokenAmount);
-                    balances[taker][takerToken] = balances[taker][takerToken].minus(fillTakerTokenAmount);
+                    balances[taker][makerTokenAddress] = balances[taker][makerTokenAddress].add(fillMakerTokenAmount);
+                    balances[taker][takerTokenAddress] = balances[taker][takerTokenAddress].minus(fillTakerTokenAmount);
                     balances[taker][zrx.address] = balances[taker][zrx.address].minus(takerFee);
                     balances[feeRecipient][zrx.address] = balances[feeRecipient][zrx.address].add(
                         makerFee.add(takerFee),
                     );
                 });
 
-                await exWrapper.batchFillOrKillOrdersAsync(orders, taker, {
+                await exWrapper.batchFillOrKillOrdersAsync(signedOrders, taker, {
                     fillTakerTokenAmounts,
                 });
 
@@ -256,17 +255,17 @@ describe('Exchange', () => {
                 expect(newBalances).to.be.deep.equal(balances);
             });
 
-            it('should throw if a single order does not fill the expected amount', async () => {
+            it('should throw if a single signedOrder does not fill the expected amount', async () => {
                 const fillTakerTokenAmounts: BigNumber[] = [];
-                orders.forEach(order => {
-                    const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
+                signedOrders.forEach(signedOrder => {
+                    const fillTakerTokenAmount = signedOrder.takerTokenAmount.div(2);
                     fillTakerTokenAmounts.push(fillTakerTokenAmount);
                 });
 
-                await exWrapper.fillOrKillOrderAsync(orders[0], taker);
+                await exWrapper.fillOrKillOrderAsync(signedOrders[0], taker);
 
                 return expect(
-                    exWrapper.batchFillOrKillOrdersAsync(orders, taker, {
+                    exWrapper.batchFillOrKillOrdersAsync(signedOrders, taker, {
                         fillTakerTokenAmounts,
                     }),
                 ).to.be.rejectedWith(constants.REVERT);
@@ -275,34 +274,34 @@ describe('Exchange', () => {
 
         describe('fillOrdersUpTo', () => {
             it('should stop when the entire fillTakerTokenAmount is filled', async () => {
-                const fillTakerTokenAmount = orders[0].params.takerTokenAmount.plus(
-                    orders[1].params.takerTokenAmount.div(2),
+                const fillTakerTokenAmount = signedOrders[0].takerTokenAmount.plus(
+                    signedOrders[1].takerTokenAmount.div(2),
                 );
-                await exWrapper.fillOrdersUpToAsync(orders, taker, {
+                await exWrapper.fillOrdersUpToAsync(signedOrders, taker, {
                     fillTakerTokenAmount,
                 });
 
                 const newBalances = await dmyBalances.getAsync();
 
-                const fillMakerTokenAmount = orders[0].params.makerTokenAmount.add(
-                    orders[1].params.makerTokenAmount.dividedToIntegerBy(2),
+                const fillMakerTokenAmount = signedOrders[0].makerTokenAmount.add(
+                    signedOrders[1].makerTokenAmount.dividedToIntegerBy(2),
                 );
-                const makerFee = orders[0].params.makerFee.add(orders[1].params.makerFee.dividedToIntegerBy(2));
-                const takerFee = orders[0].params.takerFee.add(orders[1].params.takerFee.dividedToIntegerBy(2));
-                expect(newBalances[maker][orders[0].params.makerToken]).to.be.bignumber.equal(
-                    balances[maker][orders[0].params.makerToken].minus(fillMakerTokenAmount),
+                const makerFee = signedOrders[0].makerFee.add(signedOrders[1].makerFee.dividedToIntegerBy(2));
+                const takerFee = signedOrders[0].takerFee.add(signedOrders[1].takerFee.dividedToIntegerBy(2));
+                expect(newBalances[maker][signedOrders[0].makerTokenAddress]).to.be.bignumber.equal(
+                    balances[maker][signedOrders[0].makerTokenAddress].minus(fillMakerTokenAmount),
                 );
-                expect(newBalances[maker][orders[0].params.takerToken]).to.be.bignumber.equal(
-                    balances[maker][orders[0].params.takerToken].add(fillTakerTokenAmount),
+                expect(newBalances[maker][signedOrders[0].takerTokenAddress]).to.be.bignumber.equal(
+                    balances[maker][signedOrders[0].takerTokenAddress].add(fillTakerTokenAmount),
                 );
                 expect(newBalances[maker][zrx.address]).to.be.bignumber.equal(
                     balances[maker][zrx.address].minus(makerFee),
                 );
-                expect(newBalances[taker][orders[0].params.takerToken]).to.be.bignumber.equal(
-                    balances[taker][orders[0].params.takerToken].minus(fillTakerTokenAmount),
+                expect(newBalances[taker][signedOrders[0].takerTokenAddress]).to.be.bignumber.equal(
+                    balances[taker][signedOrders[0].takerTokenAddress].minus(fillTakerTokenAmount),
                 );
-                expect(newBalances[taker][orders[0].params.makerToken]).to.be.bignumber.equal(
-                    balances[taker][orders[0].params.makerToken].add(fillMakerTokenAmount),
+                expect(newBalances[taker][signedOrders[0].makerTokenAddress]).to.be.bignumber.equal(
+                    balances[taker][signedOrders[0].makerTokenAddress].add(fillMakerTokenAmount),
                 );
                 expect(newBalances[taker][zrx.address]).to.be.bignumber.equal(
                     balances[taker][zrx.address].minus(takerFee),
@@ -312,28 +311,28 @@ describe('Exchange', () => {
                 );
             });
 
-            it('should fill all orders if cannot fill entire fillTakerTokenAmount', async () => {
+            it('should fill all signedOrders if cannot fill entire fillTakerTokenAmount', async () => {
                 const fillTakerTokenAmount = ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18);
-                orders.forEach(order => {
-                    balances[maker][order.params.makerToken] = balances[maker][order.params.makerToken].minus(
-                        order.params.makerTokenAmount,
+                signedOrders.forEach(signedOrder => {
+                    balances[maker][signedOrder.makerTokenAddress] = balances[maker][
+                        signedOrder.makerTokenAddress
+                    ].minus(signedOrder.makerTokenAmount);
+                    balances[maker][signedOrder.takerTokenAddress] = balances[maker][signedOrder.takerTokenAddress].add(
+                        signedOrder.takerTokenAmount,
                     );
-                    balances[maker][order.params.takerToken] = balances[maker][order.params.takerToken].add(
-                        order.params.takerTokenAmount,
+                    balances[maker][zrx.address] = balances[maker][zrx.address].minus(signedOrder.makerFee);
+                    balances[taker][signedOrder.makerTokenAddress] = balances[taker][signedOrder.makerTokenAddress].add(
+                        signedOrder.makerTokenAmount,
                     );
-                    balances[maker][zrx.address] = balances[maker][zrx.address].minus(order.params.makerFee);
-                    balances[taker][order.params.makerToken] = balances[taker][order.params.makerToken].add(
-                        order.params.makerTokenAmount,
-                    );
-                    balances[taker][order.params.takerToken] = balances[taker][order.params.takerToken].minus(
-                        order.params.takerTokenAmount,
-                    );
-                    balances[taker][zrx.address] = balances[taker][zrx.address].minus(order.params.takerFee);
+                    balances[taker][signedOrder.takerTokenAddress] = balances[taker][
+                        signedOrder.takerTokenAddress
+                    ].minus(signedOrder.takerTokenAmount);
+                    balances[taker][zrx.address] = balances[taker][zrx.address].minus(signedOrder.takerFee);
                     balances[feeRecipient][zrx.address] = balances[feeRecipient][zrx.address].add(
-                        order.params.makerFee.add(order.params.takerFee),
+                        signedOrder.makerFee.add(signedOrder.takerFee),
                     );
                 });
-                await exWrapper.fillOrdersUpToAsync(orders, taker, {
+                await exWrapper.fillOrdersUpToAsync(signedOrders, taker, {
                     fillTakerTokenAmount,
                 });
 
@@ -341,15 +340,15 @@ describe('Exchange', () => {
                 expect(newBalances).to.be.deep.equal(balances);
             });
 
-            it('should throw when an order does not use the same takerToken', async () => {
-                orders = await Promise.all([
+            it('should throw when an signedOrder does not use the same takerTokenAddress', async () => {
+                signedOrders = await Promise.all([
                     orderFactory.newSignedOrderAsync(),
-                    orderFactory.newSignedOrderAsync({ takerToken: zrx.address }),
+                    orderFactory.newSignedOrderAsync({ takerTokenAddress: zrx.address }),
                     orderFactory.newSignedOrderAsync(),
                 ]);
 
                 return expect(
-                    exWrapper.fillOrdersUpToAsync(orders, taker, {
+                    exWrapper.fillOrdersUpToAsync(signedOrders, taker, {
                         fillTakerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
                 ).to.be.rejectedWith(constants.REVERT);
@@ -357,13 +356,13 @@ describe('Exchange', () => {
         });
 
         describe('batchCancelOrders', () => {
-            it('should be able to cancel multiple orders', async () => {
-                const cancelTakerTokenAmounts = _.map(orders, order => order.params.takerTokenAmount);
-                await exWrapper.batchCancelOrdersAsync(orders, maker, {
+            it('should be able to cancel multiple signedOrders', async () => {
+                const cancelTakerTokenAmounts = _.map(signedOrders, signedOrder => signedOrder.takerTokenAmount);
+                await exWrapper.batchCancelOrdersAsync(signedOrders, maker, {
                     cancelTakerTokenAmounts,
                 });
 
-                await exWrapper.batchFillOrdersAsync(orders, taker, {
+                await exWrapper.batchFillOrdersAsync(signedOrders, taker, {
                     fillTakerTokenAmounts: cancelTakerTokenAmounts,
                 });
                 const newBalances = await dmyBalances.getAsync();
diff --git a/packages/contracts/util/exchange_wrapper.ts b/packages/contracts/util/exchange_wrapper.ts
index b749cd72e..03d04629d 100644
--- a/packages/contracts/util/exchange_wrapper.ts
+++ b/packages/contracts/util/exchange_wrapper.ts
@@ -1,4 +1,4 @@
-import { TransactionReceiptWithDecodedLogs, ZeroEx } from '0x.js';
+import { SignedOrder, TransactionReceiptWithDecodedLogs, ZeroEx } from '0x.js';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
@@ -6,7 +6,7 @@ import * as Web3 from 'web3';
 import { ExchangeContract } from '../src/contract_wrappers/generated/exchange';
 
 import { formatters } from './formatters';
-import { Order } from './order';
+import { signedOrderUtils } from './signed_order_utils';
 
 export class ExchangeWrapper {
     private _exchange: ExchangeContract;
@@ -16,7 +16,7 @@ export class ExchangeWrapper {
         this._zeroEx = zeroEx;
     }
     public async fillOrderAsync(
-        order: Order,
+        signedOrder: SignedOrder,
         from: string,
         opts: {
             fillTakerTokenAmount?: BigNumber;
@@ -24,15 +24,19 @@ export class ExchangeWrapper {
         } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const shouldThrowOnInsufficientBalanceOrAllowance = !!opts.shouldThrowOnInsufficientBalanceOrAllowance;
-        const params = order.createFill(shouldThrowOnInsufficientBalanceOrAllowance, opts.fillTakerTokenAmount);
+        const params = signedOrderUtils.createFill(
+            signedOrder,
+            shouldThrowOnInsufficientBalanceOrAllowance,
+            opts.fillTakerTokenAmount,
+        );
         const txHash = await this._exchange.fillOrder.sendTransactionAsync(
             params.orderAddresses,
             params.orderValues,
             params.fillTakerTokenAmount,
             params.shouldThrowOnInsufficientBalanceOrAllowance,
-            params.v as number,
-            params.r as string,
-            params.s as string,
+            params.v,
+            params.r,
+            params.s,
             { from },
         );
         const tx = await this._zeroEx.awaitTransactionMinedAsync(txHash);
@@ -41,11 +45,11 @@ export class ExchangeWrapper {
         return tx;
     }
     public async cancelOrderAsync(
-        order: Order,
+        signedOrder: SignedOrder,
         from: string,
         opts: { cancelTakerTokenAmount?: BigNumber } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = order.createCancel(opts.cancelTakerTokenAmount);
+        const params = signedOrderUtils.createCancel(signedOrder, opts.cancelTakerTokenAmount);
         const txHash = await this._exchange.cancelOrder.sendTransactionAsync(
             params.orderAddresses,
             params.orderValues,
@@ -58,19 +62,23 @@ export class ExchangeWrapper {
         return tx;
     }
     public async fillOrKillOrderAsync(
-        order: Order,
+        signedOrder: SignedOrder,
         from: string,
         opts: { fillTakerTokenAmount?: BigNumber } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const shouldThrowOnInsufficientBalanceOrAllowance = true;
-        const params = order.createFill(shouldThrowOnInsufficientBalanceOrAllowance, opts.fillTakerTokenAmount);
+        const params = signedOrderUtils.createFill(
+            signedOrder,
+            shouldThrowOnInsufficientBalanceOrAllowance,
+            opts.fillTakerTokenAmount,
+        );
         const txHash = await this._exchange.fillOrKillOrder.sendTransactionAsync(
             params.orderAddresses,
             params.orderValues,
             params.fillTakerTokenAmount,
-            params.v as number,
-            params.r as string,
-            params.s as string,
+            params.v,
+            params.r,
+            params.s,
             { from },
         );
         const tx = await this._zeroEx.awaitTransactionMinedAsync(txHash);
@@ -79,7 +87,7 @@ export class ExchangeWrapper {
         return tx;
     }
     public async batchFillOrdersAsync(
-        orders: Order[],
+        orders: SignedOrder[],
         from: string,
         opts: {
             fillTakerTokenAmounts?: BigNumber[];
@@ -108,7 +116,7 @@ export class ExchangeWrapper {
         return tx;
     }
     public async batchFillOrKillOrdersAsync(
-        orders: Order[],
+        orders: SignedOrder[],
         from: string,
         opts: { fillTakerTokenAmounts?: BigNumber[]; shouldThrowOnInsufficientBalanceOrAllowance?: boolean } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
@@ -133,7 +141,7 @@ export class ExchangeWrapper {
         return tx;
     }
     public async fillOrdersUpToAsync(
-        orders: Order[],
+        orders: SignedOrder[],
         from: string,
         opts: { fillTakerTokenAmount: BigNumber; shouldThrowOnInsufficientBalanceOrAllowance?: boolean },
     ): Promise<TransactionReceiptWithDecodedLogs> {
@@ -159,7 +167,7 @@ export class ExchangeWrapper {
         return tx;
     }
     public async batchCancelOrdersAsync(
-        orders: Order[],
+        orders: SignedOrder[],
         from: string,
         opts: { cancelTakerTokenAmounts?: BigNumber[] } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
@@ -175,19 +183,19 @@ export class ExchangeWrapper {
         _.each(tx.logs, log => wrapLogBigNumbers(log));
         return tx;
     }
-    public async getOrderHashAsync(order: Order): Promise<string> {
+    public async getOrderHashAsync(signedOrder: SignedOrder): Promise<string> {
         const shouldThrowOnInsufficientBalanceOrAllowance = false;
-        const params = order.createFill(shouldThrowOnInsufficientBalanceOrAllowance);
+        const params = signedOrderUtils.getOrderAddressesAndValues(signedOrder);
         const orderHash = await this._exchange.getOrderHash(params.orderAddresses, params.orderValues);
         return orderHash;
     }
-    public async isValidSignatureAsync(order: Order): Promise<boolean> {
+    public async isValidSignatureAsync(signedOrder: SignedOrder): Promise<boolean> {
         const isValidSignature = await this._exchange.isValidSignature(
-            order.params.maker,
-            order.params.orderHashHex as string,
-            order.params.v as number,
-            order.params.r as string,
-            order.params.s as string,
+            signedOrder.maker,
+            ZeroEx.getOrderHashHex(signedOrder),
+            signedOrder.ecSignature.v,
+            signedOrder.ecSignature.r,
+            signedOrder.ecSignature.s,
         );
         return isValidSignature;
     }
diff --git a/packages/contracts/util/formatters.ts b/packages/contracts/util/formatters.ts
index e16fe8d45..8e0dfb09e 100644
--- a/packages/contracts/util/formatters.ts
+++ b/packages/contracts/util/formatters.ts
@@ -1,12 +1,12 @@
+import { SignedOrder } from '0x.js';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 
-import { Order } from './order';
 import { BatchCancelOrders, BatchFillOrders, FillOrdersUpTo } from './types';
 
 export const formatters = {
     createBatchFill(
-        orders: Order[],
+        signedOrders: SignedOrder[],
         shouldThrowOnInsufficientBalanceOrAllowance: boolean,
         fillTakerTokenAmounts: BigNumber[] = [],
     ) {
@@ -19,33 +19,33 @@ export const formatters = {
             r: [],
             s: [],
         };
-        _.forEach(orders, order => {
+        _.forEach(signedOrders, signedOrder => {
             batchFill.orderAddresses.push([
-                order.params.maker,
-                order.params.taker,
-                order.params.makerToken,
-                order.params.takerToken,
-                order.params.feeRecipient,
+                signedOrder.maker,
+                signedOrder.taker,
+                signedOrder.makerTokenAddress,
+                signedOrder.takerTokenAddress,
+                signedOrder.feeRecipient,
             ]);
             batchFill.orderValues.push([
-                order.params.makerTokenAmount,
-                order.params.takerTokenAmount,
-                order.params.makerFee,
-                order.params.takerFee,
-                order.params.expirationTimestampInSec,
-                order.params.salt,
+                signedOrder.makerTokenAmount,
+                signedOrder.takerTokenAmount,
+                signedOrder.makerFee,
+                signedOrder.takerFee,
+                signedOrder.expirationUnixTimestampSec,
+                signedOrder.salt,
             ]);
-            batchFill.v.push(order.params.v as number);
-            batchFill.r.push(order.params.r as string);
-            batchFill.s.push(order.params.s as string);
-            if (fillTakerTokenAmounts.length < orders.length) {
-                batchFill.fillTakerTokenAmounts.push(order.params.takerTokenAmount);
+            batchFill.v.push(signedOrder.ecSignature.v);
+            batchFill.r.push(signedOrder.ecSignature.r);
+            batchFill.s.push(signedOrder.ecSignature.s);
+            if (fillTakerTokenAmounts.length < signedOrders.length) {
+                batchFill.fillTakerTokenAmounts.push(signedOrder.takerTokenAmount);
             }
         });
         return batchFill;
     },
     createFillUpTo(
-        orders: Order[],
+        signedOrders: SignedOrder[],
         shouldThrowOnInsufficientBalanceOrAllowance: boolean,
         fillTakerTokenAmount: BigNumber,
     ) {
@@ -58,52 +58,52 @@ export const formatters = {
             r: [],
             s: [],
         };
-        orders.forEach(order => {
+        signedOrders.forEach(signedOrder => {
             fillUpTo.orderAddresses.push([
-                order.params.maker,
-                order.params.taker,
-                order.params.makerToken,
-                order.params.takerToken,
-                order.params.feeRecipient,
+                signedOrder.maker,
+                signedOrder.taker,
+                signedOrder.makerTokenAddress,
+                signedOrder.takerTokenAddress,
+                signedOrder.feeRecipient,
             ]);
             fillUpTo.orderValues.push([
-                order.params.makerTokenAmount,
-                order.params.takerTokenAmount,
-                order.params.makerFee,
-                order.params.takerFee,
-                order.params.expirationTimestampInSec,
-                order.params.salt,
+                signedOrder.makerTokenAmount,
+                signedOrder.takerTokenAmount,
+                signedOrder.makerFee,
+                signedOrder.takerFee,
+                signedOrder.expirationUnixTimestampSec,
+                signedOrder.salt,
             ]);
-            fillUpTo.v.push(order.params.v as number);
-            fillUpTo.r.push(order.params.r as string);
-            fillUpTo.s.push(order.params.s as string);
+            fillUpTo.v.push(signedOrder.ecSignature.v);
+            fillUpTo.r.push(signedOrder.ecSignature.r);
+            fillUpTo.s.push(signedOrder.ecSignature.s);
         });
         return fillUpTo;
     },
-    createBatchCancel(orders: Order[], cancelTakerTokenAmounts: BigNumber[] = []) {
+    createBatchCancel(signedOrders: SignedOrder[], cancelTakerTokenAmounts: BigNumber[] = []) {
         const batchCancel: BatchCancelOrders = {
             orderAddresses: [],
             orderValues: [],
             cancelTakerTokenAmounts,
         };
-        orders.forEach(order => {
+        signedOrders.forEach(signedOrder => {
             batchCancel.orderAddresses.push([
-                order.params.maker,
-                order.params.taker,
-                order.params.makerToken,
-                order.params.takerToken,
-                order.params.feeRecipient,
+                signedOrder.maker,
+                signedOrder.taker,
+                signedOrder.makerTokenAddress,
+                signedOrder.takerTokenAddress,
+                signedOrder.feeRecipient,
             ]);
             batchCancel.orderValues.push([
-                order.params.makerTokenAmount,
-                order.params.takerTokenAmount,
-                order.params.makerFee,
-                order.params.takerFee,
-                order.params.expirationTimestampInSec,
-                order.params.salt,
+                signedOrder.makerTokenAmount,
+                signedOrder.takerTokenAmount,
+                signedOrder.makerFee,
+                signedOrder.takerFee,
+                signedOrder.expirationUnixTimestampSec,
+                signedOrder.salt,
             ]);
-            if (cancelTakerTokenAmounts.length < orders.length) {
-                batchCancel.cancelTakerTokenAmounts.push(order.params.takerTokenAmount);
+            if (cancelTakerTokenAmounts.length < signedOrders.length) {
+                batchCancel.cancelTakerTokenAmounts.push(signedOrder.takerTokenAmount);
             }
         });
         return batchCancel;
diff --git a/packages/contracts/util/order.ts b/packages/contracts/util/order.ts
deleted file mode 100644
index 57bb2bcbf..000000000
--- a/packages/contracts/util/order.ts
+++ /dev/null
@@ -1,106 +0,0 @@
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import ethUtil = require('ethereumjs-util');
-import * as _ from 'lodash';
-
-import { crypto } from './crypto';
-import { OrderParams } from './types';
-
-export class Order {
-    public params: OrderParams;
-    private _web3Wrapper: Web3Wrapper;
-    constructor(web3Wrapper: Web3Wrapper, params: OrderParams) {
-        this.params = params;
-        this._web3Wrapper = web3Wrapper;
-    }
-    public isValidSignature() {
-        const { v, r, s } = this.params;
-        if (_.isUndefined(v) || _.isUndefined(r) || _.isUndefined(s)) {
-            throw new Error('Cannot call isValidSignature on unsigned order');
-        }
-        const orderHash = this._getOrderHash();
-        const msgHash = ethUtil.hashPersonalMessage(ethUtil.toBuffer(orderHash));
-        try {
-            const pubKey = ethUtil.ecrecover(msgHash, v, ethUtil.toBuffer(r), ethUtil.toBuffer(s));
-            const recoveredAddress = ethUtil.bufferToHex(ethUtil.pubToAddress(pubKey));
-            return recoveredAddress === this.params.maker;
-        } catch (err) {
-            return false;
-        }
-    }
-    public async signAsync() {
-        const orderHash = this._getOrderHash();
-        const signature = await this._web3Wrapper.signTransactionAsync(this.params.maker, orderHash);
-        const { v, r, s } = ethUtil.fromRpcSig(signature);
-        this.params = _.assign(this.params, {
-            orderHashHex: orderHash,
-            v,
-            r: ethUtil.bufferToHex(r),
-            s: ethUtil.bufferToHex(s),
-        });
-    }
-    public createFill(shouldThrowOnInsufficientBalanceOrAllowance?: boolean, fillTakerTokenAmount?: BigNumber) {
-        const fill = {
-            orderAddresses: [
-                this.params.maker,
-                this.params.taker,
-                this.params.makerToken,
-                this.params.takerToken,
-                this.params.feeRecipient,
-            ],
-            orderValues: [
-                this.params.makerTokenAmount,
-                this.params.takerTokenAmount,
-                this.params.makerFee,
-                this.params.takerFee,
-                this.params.expirationTimestampInSec,
-                this.params.salt,
-            ],
-            fillTakerTokenAmount: fillTakerTokenAmount || this.params.takerTokenAmount,
-            shouldThrowOnInsufficientBalanceOrAllowance: !!shouldThrowOnInsufficientBalanceOrAllowance,
-            v: this.params.v,
-            r: this.params.r,
-            s: this.params.s,
-        };
-        return fill;
-    }
-    public createCancel(cancelTakerTokenAmount?: BigNumber) {
-        const cancel = {
-            orderAddresses: [
-                this.params.maker,
-                this.params.taker,
-                this.params.makerToken,
-                this.params.takerToken,
-                this.params.feeRecipient,
-            ],
-            orderValues: [
-                this.params.makerTokenAmount,
-                this.params.takerTokenAmount,
-                this.params.makerFee,
-                this.params.takerFee,
-                this.params.expirationTimestampInSec,
-                this.params.salt,
-            ],
-            cancelTakerTokenAmount: cancelTakerTokenAmount || this.params.takerTokenAmount,
-        };
-        return cancel;
-    }
-    private _getOrderHash(): string {
-        const orderHash = crypto.solSHA3([
-            this.params.exchangeContractAddress,
-            this.params.maker,
-            this.params.taker,
-            this.params.makerToken,
-            this.params.takerToken,
-            this.params.feeRecipient,
-            this.params.makerTokenAmount,
-            this.params.takerTokenAmount,
-            this.params.makerFee,
-            this.params.takerFee,
-            this.params.expirationTimestampInSec,
-            this.params.salt,
-        ]);
-        const orderHashHex = ethUtil.bufferToHex(orderHash);
-        return orderHashHex;
-    }
-}
diff --git a/packages/contracts/util/order_factory.ts b/packages/contracts/util/order_factory.ts
index 2b50f13e8..8ba5df24a 100644
--- a/packages/contracts/util/order_factory.ts
+++ b/packages/contracts/util/order_factory.ts
@@ -1,32 +1,37 @@
-import { ZeroEx } from '0x.js';
+import { Order, SignedOrder, ZeroEx } from '0x.js';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
-import { Order } from './order';
-import { DefaultOrderParams, OptionalOrderParams, OrderParams } from './types';
+import { DefaultOrderParams } from './types';
 
 export class OrderFactory {
-    private _defaultOrderParams: DefaultOrderParams;
-    private _web3Wrapper: Web3Wrapper;
-    constructor(web3Wrapper: Web3Wrapper, defaultOrderParams: DefaultOrderParams) {
+    private _defaultOrderParams: Partial<Order>;
+    private _zeroEx: ZeroEx;
+    constructor(zeroEx: ZeroEx, defaultOrderParams: Partial<Order>) {
         this._defaultOrderParams = defaultOrderParams;
-        this._web3Wrapper = web3Wrapper;
+        this._zeroEx = zeroEx;
     }
-    public async newSignedOrderAsync(customOrderParams: OptionalOrderParams = {}): Promise<Order> {
+    public async newSignedOrderAsync(customOrderParams: Partial<Order> = {}): Promise<SignedOrder> {
         const randomExpiration = new BigNumber(Math.floor((Date.now() + Math.random() * 100000000000) / 1000));
-        const orderParams: OrderParams = _.assign(
-            {},
-            {
-                expirationTimestampInSec: randomExpiration,
-                salt: ZeroEx.generatePseudoRandomSalt(),
-                taker: ZeroEx.NULL_ADDRESS,
-            },
-            this._defaultOrderParams,
-            customOrderParams,
+        const order = ({
+            expirationUnixTimestampSec: randomExpiration,
+            salt: ZeroEx.generatePseudoRandomSalt(),
+            taker: ZeroEx.NULL_ADDRESS,
+            ...this._defaultOrderParams,
+            ...customOrderParams,
+        } as any) as Order;
+        const orderHashHex = ZeroEx.getOrderHashHex(order);
+        const shouldAddPersonalMessagePrefix = false;
+        const ecSignature = await this._zeroEx.signOrderHashAsync(
+            orderHashHex,
+            order.maker,
+            shouldAddPersonalMessagePrefix,
         );
-        const order = new Order(this._web3Wrapper, orderParams);
-        await order.signAsync();
-        return order;
+        const signedOrder = {
+            ...order,
+            ecSignature,
+        };
+        return signedOrder;
     }
 }
diff --git a/packages/contracts/util/signed_order_utils.ts b/packages/contracts/util/signed_order_utils.ts
new file mode 100644
index 000000000..fc2f800cd
--- /dev/null
+++ b/packages/contracts/util/signed_order_utils.ts
@@ -0,0 +1,49 @@
+import { SignedOrder } from '0x.js';
+import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import ethUtil = require('ethereumjs-util');
+import * as _ from 'lodash';
+
+import { crypto } from './crypto';
+
+export const signedOrderUtils = {
+    createFill: (
+        signedOrder: SignedOrder,
+        shouldThrowOnInsufficientBalanceOrAllowance?: boolean,
+        fillTakerTokenAmount?: BigNumber,
+    ) => {
+        const fill = {
+            ...signedOrderUtils.getOrderAddressesAndValues(signedOrder),
+            fillTakerTokenAmount: fillTakerTokenAmount || signedOrder.takerTokenAmount,
+            shouldThrowOnInsufficientBalanceOrAllowance: !!shouldThrowOnInsufficientBalanceOrAllowance,
+            ...signedOrder.ecSignature,
+        };
+        return fill;
+    },
+    createCancel(signedOrder: SignedOrder, cancelTakerTokenAmount?: BigNumber) {
+        const cancel = {
+            ...signedOrderUtils.getOrderAddressesAndValues(signedOrder),
+            cancelTakerTokenAmount: cancelTakerTokenAmount || signedOrder.takerTokenAmount,
+        };
+        return cancel;
+    },
+    getOrderAddressesAndValues(signedOrder: SignedOrder) {
+        return {
+            orderAddresses: [
+                signedOrder.maker,
+                signedOrder.taker,
+                signedOrder.makerTokenAddress,
+                signedOrder.takerTokenAddress,
+                signedOrder.feeRecipient,
+            ],
+            orderValues: [
+                signedOrder.makerTokenAmount,
+                signedOrder.takerTokenAmount,
+                signedOrder.makerFee,
+                signedOrder.takerFee,
+                signedOrder.expirationUnixTimestampSec,
+                signedOrder.salt,
+            ],
+        };
+    },
+};
diff --git a/packages/contracts/util/types.ts b/packages/contracts/util/types.ts
index 38fd33161..65bc26f79 100644
--- a/packages/contracts/util/types.ts
+++ b/packages/contracts/util/types.ts
@@ -49,39 +49,6 @@ export interface DefaultOrderParams {
     takerFee: BigNumber;
 }
 
-export interface OptionalOrderParams {
-    exchangeContractAddress?: string;
-    maker?: string;
-    taker?: string;
-    feeRecipient?: string;
-    makerToken?: string;
-    takerToken?: string;
-    makerTokenAmount?: BigNumber;
-    takerTokenAmount?: BigNumber;
-    makerFee?: BigNumber;
-    takerFee?: BigNumber;
-    expirationTimestampInSec?: BigNumber;
-}
-
-export interface OrderParams {
-    exchangeContractAddress: string;
-    maker: string;
-    taker: string;
-    feeRecipient: string;
-    makerToken: string;
-    takerToken: string;
-    makerTokenAmount: BigNumber;
-    takerTokenAmount: BigNumber;
-    makerFee: BigNumber;
-    takerFee: BigNumber;
-    expirationTimestampInSec: BigNumber;
-    salt: BigNumber;
-    orderHashHex?: string;
-    v?: number;
-    r?: string;
-    s?: string;
-}
-
 export interface TransactionDataParams {
     name: string;
     abi: Web3.AbiDefinition[];