4 files changed, 64 insertions, 17 deletions
diff --git a/packages/base-contract/CHANGELOG.json b/packages/base-contract/CHANGELOG.json
index c5d467b7f..106c26989 100644
--- a/packages/base-contract/CHANGELOG.json
+++ b/packages/base-contract/CHANGELOG.json
@@ -1,12 +1,22 @@
 [
     {
+        "timestamp": 1525477860,
+        "version": "0.3.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
         "version": "0.3.0",
         "changes": [
             {
                 "note": "Update ethers-contracts to ethers.js",
                 "pr": 540
             }
-        ]
+        ],
+        "timestamp": 1525428773
     },
     {
         "timestamp": 1524044013,
diff --git a/packages/base-contract/CHANGELOG.md b/packages/base-contract/CHANGELOG.md
index 90f1ff5ed..b57bd5fc0 100644
--- a/packages/base-contract/CHANGELOG.md
+++ b/packages/base-contract/CHANGELOG.md
@@ -5,11 +5,19 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v0.3.1 - _May 5, 2018_
+
+    * Dependencies updated
+
+## v0.3.0 - _May 4, 2018_
+
+    * Update ethers-contracts to ethers.js (#540)
+
 ## v0.2.1 - _April 18, 2018_
 
     * Dependencies updated
 
-## v0.2.0 - _April 12, 2018_
+## v0.2.0 - _April 11, 2018_
 
     * Contract wrappers now accept Provider and defaults instead of Web3Wrapper (#501)
 
@@ -23,6 +31,6 @@ CHANGELOG
 
     * Dependencies updated
 
-## v0.0.2 - _March 4, 2018_
+## v0.0.2 - _March 3, 2018_
 
     * Initial release
diff --git a/packages/base-contract/package.json b/packages/base-contract/package.json
index 78dcbfe7f..90253616b 100644
--- a/packages/base-contract/package.json
+++ b/packages/base-contract/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@0xproject/base-contract",
-    "version": "0.2.1",
+    "version": "0.3.1",
     "description": "0x Base TS contract",
     "main": "lib/src/index.js",
     "types": "lib/src/index.d.ts",
@@ -26,8 +26,8 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/packages/base-contract/README.md",
     "devDependencies": {
-        "@0xproject/monorepo-scripts": "^0.1.18",
-        "@0xproject/tslint-config": "^0.4.16",
+        "@0xproject/monorepo-scripts": "^0.1.19",
+        "@0xproject/tslint-config": "^0.4.17",
         "@types/lodash": "4.14.104",
         "chai": "^4.0.1",
         "copyfiles": "^1.2.0",
@@ -38,10 +38,10 @@
         "typescript": "2.7.1"
     },
     "dependencies": {
-        "@0xproject/types": "^0.6.1",
-        "@0xproject/typescript-typings": "^0.2.0",
-        "@0xproject/utils": "^0.5.2",
-        "@0xproject/web3-wrapper": "^0.6.1",
+        "@0xproject/types": "^0.6.3",
+        "@0xproject/typescript-typings": "^0.3.1",
+        "@0xproject/utils": "^0.6.1",
+        "@0xproject/web3-wrapper": "^0.6.3",
         "ethers": "^3.0.15",
         "lodash": "^4.17.4"
     },
diff --git a/packages/base-contract/src/index.ts b/packages/base-contract/src/index.ts
index e95b18db6..f9298f413 100644
--- a/packages/base-contract/src/index.ts
+++ b/packages/base-contract/src/index.ts
@@ -1,6 +1,7 @@
 import {
     AbiDefinition,
     AbiType,
+    ConstructorAbi,
     ContractAbi,
     DataItem,
     MethodAbi,
@@ -24,6 +25,8 @@ export class BaseContract {
     protected _web3Wrapper: Web3Wrapper;
     public abi: ContractAbi;
     public address: string;
+    public contractName: string;
+    public constructorArgs: any[] = [];
     protected static _formatABIDataItemList(
         abis: DataItem[],
         values: any[],
@@ -37,11 +40,31 @@ export class BaseContract {
     protected static _bigNumberToString(type: string, value: any): any {
         return _.isObject(value) && value.isBigNumber ? value.toString() : value;
     }
+    protected static _lookupConstructorAbi(abi: ContractAbi): ConstructorAbi {
+        const constructorAbiIfExists = _.find(
+            abi,
+            (abiDefinition: AbiDefinition) => abiDefinition.type === AbiType.Constructor,
+        ) as ConstructorAbi | undefined;
+        if (!_.isUndefined(constructorAbiIfExists)) {
+            return constructorAbiIfExists;
+        } else {
+            // If the constructor is not explicitly defined, it won't be included in the ABI. It is
+            // still callable however, so we construct what the ABI would look like were it to exist.
+            const defaultConstructorAbi: ConstructorAbi = {
+                type: AbiType.Constructor,
+                stateMutability: 'nonpayable',
+                payable: false,
+                inputs: [],
+            };
+            return defaultConstructorAbi;
+        }
+    }
     protected static _bnToBigNumber(type: string, value: any): any {
         return _.isObject(value) && value._bn ? new BigNumber(value.toString()) : value;
     }
-    protected async _applyDefaultsToTxDataAsync<T extends Partial<TxData | TxDataPayable>>(
+    protected static async _applyDefaultsToTxDataAsync<T extends Partial<TxData | TxDataPayable>>(
         txData: T,
+        txDefaults: Partial<TxData>,
         estimateGasAsync?: (txData: T) => Promise<number>,
     ): Promise<TxData> {
         // Gas amount sourced with the following priorities:
@@ -49,13 +72,12 @@ export class BaseContract {
         // 2. Global config passed in at library instantiation
         // 3. Gas estimate calculation + safety margin
         const removeUndefinedProperties = _.pickBy;
-        const txDataWithDefaults = ({
-            to: this.address,
-            ...removeUndefinedProperties(this._web3Wrapper.getContractDefaults()),
+        const txDataWithDefaults: TxData = {
+            ...removeUndefinedProperties(txDefaults),
             ...removeUndefinedProperties(txData as any),
             // HACK: TS can't prove that T is spreadable.
             // Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
-        } as any) as TxData;
+        } as any;
         if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
             const estimatedGas = await estimateGasAsync(txData);
             txDataWithDefaults.gas = estimatedGas;
@@ -82,8 +104,15 @@ export class BaseContract {
         }) as MethodAbi;
         return methodAbi;
     }
-    constructor(abi: ContractAbi, address: string, provider: Provider, defaults?: Partial<TxData>) {
-        this._web3Wrapper = new Web3Wrapper(provider, defaults);
+    constructor(
+        contractName: string,
+        abi: ContractAbi,
+        address: string,
+        provider: Provider,
+        txDefaults?: Partial<TxData>,
+    ) {
+        this.contractName = contractName;
+        this._web3Wrapper = new Web3Wrapper(provider, txDefaults);
         this.abi = abi;
         this.address = address;
         const methodAbis = this.abi.filter(