Merge pull request #1011 from 0xProject/sra-api/rename/sra-spec

[sra-spec] Rename the sra-api package to sra-spec

19 files changed, 894 insertions, 0 deletions

diff --git a/packages/sra-spec/src/api.ts b/packages/sra-spec/src/api.ts
new file mode 100644
index 000000000..f80d343d8
--- /dev/null
+++ b/packages/sra-spec/src/api.ts
@@ -0,0 +1,310 @@
+import { OpenApiSpec } from '@loopback/openapi-v3-types';
+
+import { examples } from './examples';
+import { schemas } from './json-schemas';
+import { md } from './md';
+import { generateParameters } from './parameters';
+import { generateResponses } from './responses';
+
+export const api: OpenApiSpec = {
+    openapi: '3.0.0',
+    info: {
+        version: '2.0.0',
+        title: 'Standard Relayer REST API',
+        description: md.introduction,
+        license: {
+            name: 'Apache 2.0',
+            url: 'https://www.apache.org/licenses/LICENSE-2.0.html',
+        },
+    },
+    paths: {
+        '/v2/asset_pairs': {
+            get: {
+                description:
+                    'Retrieves a list of available asset pairs and the information required to trade them (in any order). Setting only `assetDataA` or `assetDataB` returns pairs filtered by that asset only.',
+                operationId: 'getAssetPairs',
+                parameters: generateParameters(
+                    [
+                        {
+                            name: 'assetDataA',
+                            in: 'query',
+                            description: 'The assetData value for the first asset in the pair.',
+                            example: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                        {
+                            name: 'assetDataB',
+                            in: 'query',
+                            description: 'The assetData value for the second asset in the pair.',
+                            example: '0x0257179264389b814a946f3e92105513705ca6b990',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                    ],
+                    true,
+                ),
+                responses: generateResponses(
+                    'relayerApiAssetDataPairsResponseSchema',
+                    examples.relayerApiAssetDataPairsResponse,
+                    `Returns a collection of available asset pairs with some meta info`,
+                ),
+            },
+        },
+        '/v2/orders': {
+            get: {
+                description:
+                    'Retrieves a list of orders given query parameters. This endpoint should be [paginated](#section/Pagination). For querying an entire orderbook snapshot, the [orderbook endpoint](#operation/getOrderbook) is recommended. If both makerAssetData and takerAssetData are specified, returned orders will be sorted by price determined by (takerTokenAmount/makerTokenAmount) in ascending order. By default, orders returned by this endpoint are unsorted.',
+                operationId: 'getOrders',
+                parameters: generateParameters(
+                    [
+                        {
+                            name: 'makerAssetProxyId',
+                            in: 'query',
+                            description: `The maker [asset proxy id](https://0xproject.com/docs/0x.js#types-AssetProxyId) (example: "0xf47261b0" for ERC20, "0x02571792" for ERC721).`,
+                            example: '0xf47261b0',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                        {
+                            name: 'takerAssetProxyId',
+                            in: 'query',
+                            description: `The taker asset [asset proxy id](https://0xproject.com/docs/0x.js#types-AssetProxyId) (example: "0xf47261b0" for ERC20, "0x02571792" for ERC721).`,
+                            example: '0x02571792',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                        {
+                            name: 'makerAssetAddress',
+                            in: 'query',
+                            description: `The contract address for the maker asset.`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                        {
+                            name: 'takerAssetAddress',
+                            in: 'query',
+                            description: `The contract address for the taker asset.`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                        {
+                            name: 'exchangeAddress',
+                            in: 'query',
+                            description: `Same as exchangeAddress in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                        {
+                            name: 'senderAddress',
+                            in: 'query',
+                            description: `Same as senderAddress in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                        {
+                            name: 'makerAssetData',
+                            in: 'query',
+                            description: `Same as makerAssetData in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                        {
+                            name: 'takerAssetData',
+                            in: 'query',
+                            description: `Same as takerAssetData in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                        {
+                            name: 'traderAssetData',
+                            in: 'query',
+                            description: `Same as traderAssetData in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                        {
+                            name: 'makerAddress',
+                            in: 'query',
+                            description: `Same as makerAddress in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                        {
+                            name: 'takerAddress',
+                            in: 'query',
+                            description: `Same as takerAddress in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                        {
+                            name: 'traderAddress',
+                            in: 'query',
+                            description: `Same as traderAddress in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                        {
+                            name: 'feeRecipientAddress',
+                            in: 'query',
+                            description: `Same as feeRecipientAddress in the [0x Protocol v2 Specification](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#order-message-format)`,
+                            example: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                            schema: {
+                                $ref: '#/components/schemas/addressSchema',
+                            },
+                        },
+                    ],
+                    true,
+                ),
+                responses: generateResponses(
+                    'relayerApiOrdersResponseSchema',
+                    examples.relayerApiOrdersResponse,
+                    `A collection of 0x orders with meta-data as specified by query params`,
+                ),
+            },
+        },
+        '/v2/order/{orderHash}': {
+            get: {
+                description: 'Retrieves the 0x order with meta info that is associated with the hash.',
+                operationId: 'getOrder',
+                parameters: generateParameters(
+                    [
+                        {
+                            name: 'orderHash',
+                            in: 'path',
+                            description: 'The hash of the desired 0x order.',
+                            example: '0xd4b103c42d2512eef3fee775e097f044291615d25f5d71e0ac70dbd49d223591',
+                            schema: {
+                                $ref: '#/components/schemas/orderHashSchema',
+                            },
+                        },
+                    ],
+                    false,
+                ),
+                responses: generateResponses(
+                    'relayerApiOrderSchema',
+                    examples.relayerApiOrder,
+                    `The order and meta info associated with the orderHash`,
+                ),
+            },
+        },
+        '/v2/orderbook': {
+            get: {
+                description: `Retrieves the orderbook for a given asset pair. This endpoint should be [paginated](#section/Pagination). Bids will be sorted in descending order by price, and asks will be sorted in ascending order by price. Within the price sorted orders, the orders are further sorted by _taker fee price_ which is defined as the **takerFee** divided by **takerTokenAmount**. After _taker fee price_, orders are to be sorted by expiration in ascending order. The way pagination works for this endpoint is that the **page** and **perPage** query params apply to both \`bids\` and \`asks\` collections, and if \`page\` * \`perPage\` > \`total\` for a certain collection, the \`records\` for that collection should just be empty. `,
+                operationId: 'getOrderbook',
+                parameters: generateParameters(
+                    [
+                        {
+                            name: 'baseAssetData',
+                            in: 'query',
+                            description: `assetData (makerAssetData or takerAssetData) designated as the base currency in the [currency pair calculation](https://en.wikipedia.org/wiki/Currency_pair) of price.`,
+                            required: true,
+                            example: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                        {
+                            name: 'quoteAssetData',
+                            in: 'query',
+                            description: `assetData (makerAssetData or takerAssetData) designated as the quote currency in the currency pair calculation of price (required).`,
+                            required: true,
+                            example: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+                            schema: {
+                                $ref: '#/components/schemas/hexSchema',
+                            },
+                        },
+                    ],
+                    true,
+                ),
+                responses: generateResponses(
+                    'relayerApiOrderbookResponseSchema',
+                    examples.relayerApiOrderbookResponse,
+                    `The sorted order book for the specified asset pair.`,
+                ),
+            },
+        },
+        '/v2/order_config': {
+            get: {
+                description: `Relayers have full discretion over the orders that they are willing to host on their orderbooks (e.g what fees they charge, etc...). In order for traders to discover their requirements programmatically, they can send an incomplete order to this endpoint and receive the missing fields, specifc to that order. This gives relayers a large amount of flexibility to tailor fees to unique traders, trading pairs and volume amounts. Submit a partial order and receive information required to complete the order: \`senderAddress\`, \`feeRecipientAddress\`, \`makerFee\`, \`takerFee\`. `,
+                operationId: 'getOrderConfig',
+                parameters: generateParameters([], false),
+                requestBody: {
+                    description:
+                        'The fields of a 0x order the relayer may want to decide what configuration to send back.',
+                    content: {
+                        'application/json': {
+                            schema: {
+                                $ref: '#/components/schemas/relayerApiOrderConfigPayloadSchema',
+                            },
+                            example: examples.relayerApiOrderConfigPayload,
+                        },
+                    },
+                },
+                responses: generateResponses(
+                    'relayerApiOrderConfigResponseSchema',
+                    examples.relayerApiOrderConfigResponse,
+                    `The additional fields necessary in order to submit an order to the relayer.`,
+                ),
+            },
+        },
+        '/v2/fee_recipients': {
+            get: {
+                description: `Retrieves a collection of all fee recipient addresses for a relayer. This endpoint should be [paginated](#section/Pagination).`,
+                operationId: 'getFeeRecipients',
+                parameters: generateParameters([], true),
+                responses: generateResponses(
+                    'relayerApiFeeRecipientsResponseSchema',
+                    examples.relayerApiFeeRecipientsResponse,
+                    `A collection of all used fee recipient addresses.`,
+                ),
+            },
+        },
+        '/v2/order': {
+            post: {
+                description: `Submit a signed order to the relayer.`,
+                operationId: 'postOrder',
+                parameters: generateParameters([], false),
+                requestBody: {
+                    description: 'A valid signed 0x order based on the schema.',
+                    content: {
+                        'application/json': {
+                            schema: {
+                                $ref: '#/components/schemas/signedOrderSchema',
+                            },
+                            example: examples.signedOrder,
+                        },
+                    },
+                },
+                responses: generateResponses(),
+            },
+        },
+    },
+    components: {
+        schemas,
+    },
+};
diff --git a/packages/sra-spec/src/errors.ts b/packages/sra-spec/src/errors.ts
new file mode 100644
index 000000000..20c35514f
--- /dev/null
+++ b/packages/sra-spec/src/errors.ts
@@ -0,0 +1,24 @@
+import { examples } from './examples';
+export const errorResponses = {
+    '400': {
+        description: 'Validation error',
+        content: {
+            'application/json': {
+                schema: { $ref: '#/components/schemas/relayerApiErrorResponseSchema' },
+                example: examples.validationError,
+            },
+        },
+    },
+    '404': {
+        description: 'Not found',
+    },
+    '429': {
+        description: 'Too many requests - Rate limit exceeded',
+    },
+    '500': {
+        description: 'Internal Server Error',
+    },
+    '501': {
+        description: 'Not implemented.',
+    },
+};
diff --git a/packages/sra-spec/src/examples/errors.ts b/packages/sra-spec/src/examples/errors.ts
new file mode 100644
index 000000000..81f29d81c
--- /dev/null
+++ b/packages/sra-spec/src/examples/errors.ts
@@ -0,0 +1,11 @@
+export const validationError = {
+    code: 100,
+    reason: 'Validation failed',
+    validationErrors: [
+        {
+            field: 'networkId',
+            code: 1006,
+            reason: 'Network id 42 is not supported',
+        },
+    ],
+};
diff --git a/packages/sra-spec/src/examples/index.ts b/packages/sra-spec/src/examples/index.ts
new file mode 100644
index 000000000..dcf9b13eb
--- /dev/null
+++ b/packages/sra-spec/src/examples/index.ts
@@ -0,0 +1,21 @@
+import { validationError } from './errors';
+import { relayerApiAssetDataPairsResponse } from './relayerApiAssetDataPairsResponse';
+import { relayerApiFeeRecipientsResponse } from './relayerApiFeeRecipientsResponse';
+import { relayerApiOrder } from './relayerApiOrder';
+import { relayerApiOrderbookResponse } from './relayerApiOrderbookResponse';
+import { relayerApiOrderConfigPayload } from './relayerApiOrderConfigPayload';
+import { relayerApiOrderConfigResponse } from './relayerApiOrderConfigResponse';
+import { relayerApiOrdersResponse } from './relayerApiOrdersResponse';
+import { signedOrder } from './signedOrder';
+
+export const examples = {
+    validationError,
+    relayerApiAssetDataPairsResponse,
+    relayerApiFeeRecipientsResponse,
+    relayerApiOrder,
+    relayerApiOrderbookResponse,
+    relayerApiOrderConfigPayload,
+    relayerApiOrderConfigResponse,
+    relayerApiOrdersResponse,
+    signedOrder,
+};
diff --git a/packages/sra-spec/src/examples/relayerApiAssetDataPairsResponse.ts b/packages/sra-spec/src/examples/relayerApiAssetDataPairsResponse.ts
new file mode 100644
index 000000000..9eead5239
--- /dev/null
+++ b/packages/sra-spec/src/examples/relayerApiAssetDataPairsResponse.ts
@@ -0,0 +1,21 @@
+export const relayerApiAssetDataPairsResponse = {
+    total: 43,
+    page: 1,
+    perPage: 100,
+    records: [
+        {
+            assetDataA: {
+                minAmount: '0',
+                maxAmount: '10000000000000000000',
+                precision: 5,
+                assetData: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+            },
+            assetDataB: {
+                minAmount: '0',
+                maxAmount: '50000000000000000000',
+                precision: 5,
+                assetData: '0x0257179264389b814a946f3e92105513705ca6b990',
+            },
+        },
+    ],
+};
diff --git a/packages/sra-spec/src/examples/relayerApiFeeRecipientsResponse.ts b/packages/sra-spec/src/examples/relayerApiFeeRecipientsResponse.ts
new file mode 100644
index 000000000..0182af629
--- /dev/null
+++ b/packages/sra-spec/src/examples/relayerApiFeeRecipientsResponse.ts
@@ -0,0 +1,10 @@
+export const relayerApiFeeRecipientsResponse = {
+    total: 3,
+    page: 1,
+    perPage: 10,
+    records: [
+        '0x6eC92694ea172ebC430C30fa31De87620967A082',
+        '0x9e56625509c2f60af937f23b7b532600390e8c8b',
+        '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+    ],
+};
diff --git a/packages/sra-spec/src/examples/relayerApiOrder.ts b/packages/sra-spec/src/examples/relayerApiOrder.ts
new file mode 100644
index 000000000..31181d677
--- /dev/null
+++ b/packages/sra-spec/src/examples/relayerApiOrder.ts
@@ -0,0 +1,19 @@
+export const relayerApiOrder = {
+    order: {
+        makerAddress: '0x9e56625509c2f60af937f23b7b532600390e8c8b',
+        takerAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+        feeRecipientAddress: '0xb046140686d052fff581f63f8136cce132e857da',
+        senderAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+        makerAssetAmount: '10000000000000000',
+        takerAssetAmount: '20000000000000000',
+        makerFee: '100000000000000',
+        takerFee: '200000000000000',
+        expirationTimeSeconds: '1532560590',
+        salt: '1532559225',
+        makerAssetData: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+        takerAssetData: '0x0257179264389b814a946f3e92105513705ca6b990',
+        exchangeAddress: '0x12459c951127e0c374ff9105dda097662a027093',
+        signature: '0x012761a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc33',
+    },
+    metaData: {},
+};
diff --git a/packages/sra-spec/src/examples/relayerApiOrderConfigPayload.ts b/packages/sra-spec/src/examples/relayerApiOrderConfigPayload.ts
new file mode 100644
index 000000000..5251d5b4d
--- /dev/null
+++ b/packages/sra-spec/src/examples/relayerApiOrderConfigPayload.ts
@@ -0,0 +1,10 @@
+export const relayerApiOrderConfigPayload = {
+    makerAddress: '0x9e56625509c2f60af937f23b7b532600390e8c8b',
+    takerAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+    makerAssetAmount: '10000000000000000',
+    takerAssetAmount: '20000000000000000',
+    makerAssetData: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+    takerAssetData: '0x0257179264389b814a946f3e92105513705ca6b990',
+    exchangeAddress: '0x12459c951127e0c374ff9105dda097662a027093',
+    expirationTimeSeconds: '1532560590',
+};
diff --git a/packages/sra-spec/src/examples/relayerApiOrderConfigResponse.ts b/packages/sra-spec/src/examples/relayerApiOrderConfigResponse.ts
new file mode 100644
index 000000000..a3c531c0a
--- /dev/null
+++ b/packages/sra-spec/src/examples/relayerApiOrderConfigResponse.ts
@@ -0,0 +1,6 @@
+export const relayerApiOrderConfigResponse = {
+    senderAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+    feeRecipientAddress: '0xb046140686d052fff581f63f8136cce132e857da',
+    makerFee: '100000000000000',
+    takerFee: '200000000000000',
+};
diff --git a/packages/sra-spec/src/examples/relayerApiOrderbookResponse.ts b/packages/sra-spec/src/examples/relayerApiOrderbookResponse.ts
new file mode 100644
index 000000000..40c09eff9
--- /dev/null
+++ b/packages/sra-spec/src/examples/relayerApiOrderbookResponse.ts
@@ -0,0 +1,54 @@
+export const relayerApiOrderbookResponse = {
+    bids: {
+        total: 325,
+        page: 2,
+        perPage: 100,
+        records: [
+            {
+                order: {
+                    makerAddress: '0x9e56625509c2f60af937f23b7b532600390e8c8b',
+                    takerAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+                    feeRecipientAddress: '0xb046140686d052fff581f63f8136cce132e857da',
+                    senderAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+                    makerAssetAmount: '10000000000000000',
+                    takerAssetAmount: '20000000000000000',
+                    makerFee: '100000000000000',
+                    takerFee: '200000000000000',
+                    expirationTimeSeconds: '1532560590',
+                    salt: '1532559225',
+                    makerAssetData: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+                    takerAssetData: '0x0257179264389b814a946f3e92105513705ca6b990',
+                    exchangeAddress: '0x12459c951127e0c374ff9105dda097662a027093',
+                    signature: '0x012761a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc33',
+                },
+                metaData: {},
+            },
+        ],
+    },
+    asks: {
+        total: 500,
+        page: 2,
+        perPage: 100,
+        records: [
+            {
+                order: {
+                    makerAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+                    takerAddress: '0x9e56625509c2f60af937f23b7b532600390e8c8b',
+                    feeRecipientAddress: '0xb046140686d052fff581f63f8136cce132e857da',
+                    senderAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+                    makerAssetAmount: '20000000000000000',
+                    takerAssetAmount: '10000000000000000',
+                    makerFee: '200000000000000',
+                    takerFee: '100000000000000',
+                    expirationTimeSeconds: '1532560590',
+                    salt: '1532559225',
+                    makerAssetData: '0x0257179264389b814a946f3e92105513705ca6b990',
+                    takerAssetData: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+                    exchangeAddress: '0x12459c951127e0c374ff9105dda097662a027093',
+                    signature: '0x013842a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b3518891',
+                },
+                metaData: {},
+            },
+        ],
+    },
+};
diff --git a/packages/sra-spec/src/examples/relayerApiOrdersResponse.ts b/packages/sra-spec/src/examples/relayerApiOrdersResponse.ts
new file mode 100644
index 000000000..ac16e7e34
--- /dev/null
+++ b/packages/sra-spec/src/examples/relayerApiOrdersResponse.ts
@@ -0,0 +1,26 @@
+export const relayerApiOrdersResponse = {
+    total: 984,
+    page: 1,
+    perPage: 100,
+    records: [
+        {
+            order: {
+                makerAddress: '0x9e56625509c2f60af937f23b7b532600390e8c8b',
+                takerAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+                feeRecipientAddress: '0xb046140686d052fff581f63f8136cce132e857da',
+                senderAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+                makerAssetAmount: '10000000000000000',
+                takerAssetAmount: '20000000000000000',
+                makerFee: '100000000000000',
+                takerFee: '200000000000000',
+                expirationTimeSeconds: '1532560590',
+                salt: '1532559225',
+                makerAssetData: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+                takerAssetData: '0x0257179264389b814a946f3e92105513705ca6b990',
+                exchangeAddress: '0x12459c951127e0c374ff9105dda097662a027093',
+                signature: '0x012761a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc33',
+            },
+            metaData: {},
+        },
+    ],
+};
diff --git a/packages/sra-spec/src/examples/signedOrder.ts b/packages/sra-spec/src/examples/signedOrder.ts
new file mode 100644
index 000000000..440566027
--- /dev/null
+++ b/packages/sra-spec/src/examples/signedOrder.ts
@@ -0,0 +1,16 @@
+export const signedOrder = {
+    makerAddress: '0x9e56625509c2f60af937f23b7b532600390e8c8b',
+    takerAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+    feeRecipientAddress: '0xb046140686d052fff581f63f8136cce132e857da',
+    senderAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
+    makerAssetAmount: '10000000000000000',
+    takerAssetAmount: '20000000000000000',
+    makerFee: '100000000000000',
+    takerFee: '200000000000000',
+    expirationTimeSeconds: '1532560590',
+    salt: '1532559225',
+    makerAssetData: '0xf47261b04c32345ced77393b3530b1eed0f346429d',
+    takerAssetData: '0x0257179264389b814a946f3e92105513705ca6b990',
+    exchangeAddress: '0x12459c951127e0c374ff9105dda097662a027093',
+    signature: '0x012761a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc33',
+};
diff --git a/packages/sra-spec/src/headers.ts b/packages/sra-spec/src/headers.ts
new file mode 100644
index 000000000..152254c9f
--- /dev/null
+++ b/packages/sra-spec/src/headers.ts
@@ -0,0 +1,20 @@
+export const headers = {
+    'X-Rate-Limit-Limit': {
+        description: `The maximum number of requests you're permitted to make per hour.`,
+        schema: {
+            type: 'integer',
+        },
+    },
+    'X-Rate-Limit-Remaining': {
+        description: 'The number of requests remaining in the current rate limit window.',
+        schema: {
+            type: 'integer',
+        },
+    },
+    'X-Rate-Limit-Reset': {
+        description: 'The time at which the current rate limit window resets in UTC epoch seconds.',
+        schema: {
+            type: 'integer',
+        },
+    },
+};
diff --git a/packages/sra-spec/src/index.ts b/packages/sra-spec/src/index.ts
new file mode 100644
index 000000000..4d73f3cd3
--- /dev/null
+++ b/packages/sra-spec/src/index.ts
@@ -0,0 +1 @@
+export { api } from './api';
diff --git a/packages/sra-spec/src/json-schemas.ts b/packages/sra-spec/src/json-schemas.ts
new file mode 100644
index 000000000..173a04bfb
--- /dev/null
+++ b/packages/sra-spec/src/json-schemas.ts
@@ -0,0 +1,63 @@
+import { schemas as jsonSchemas } from '@0xproject/json-schemas';
+
+// Only include schemas we actually need
+const {
+    numberSchema,
+    addressSchema,
+    hexSchema,
+    orderHashSchema,
+    orderSchema,
+    signedOrderSchema,
+    signedOrdersSchema,
+    ordersSchema,
+    paginatedCollectionSchema,
+    relayerApiErrorResponseSchema,
+    relayerApiFeeRecipientsResponseSchema,
+    relayerApiOrderSchema,
+    relayerApiOrdersSchema,
+    relayerApiOrderConfigPayloadSchema,
+    relayerApiOrderConfigResponseSchema,
+    relayerApiOrderbookResponseSchema,
+    relayerApiAssetDataPairsResponseSchema,
+    relayerApiAssetDataTradeInfoSchema,
+    relayerApiOrdersChannelSubscribeSchema,
+    relayerApiOrdersChannelSubscribePayload,
+    relayerApiOrdersChannelUpdateSchema,
+    relayerApiOrdersResponseSchema,
+    relayerApiAssetDataPairsSchema,
+} = jsonSchemas;
+
+const usedSchemas = {
+    numberSchema,
+    addressSchema,
+    hexSchema,
+    orderHashSchema,
+    orderSchema,
+    signedOrderSchema,
+    signedOrdersSchema,
+    ordersSchema,
+    paginatedCollectionSchema,
+    relayerApiErrorResponseSchema,
+    relayerApiFeeRecipientsResponseSchema,
+    relayerApiOrderSchema,
+    relayerApiOrdersSchema,
+    relayerApiOrderConfigPayloadSchema,
+    relayerApiOrderConfigResponseSchema,
+    relayerApiOrderbookResponseSchema,
+    relayerApiAssetDataPairsResponseSchema,
+    relayerApiAssetDataTradeInfoSchema,
+    relayerApiOrdersChannelSubscribeSchema,
+    relayerApiOrdersChannelSubscribePayload,
+    relayerApiOrdersChannelUpdateSchema,
+    relayerApiOrdersResponseSchema,
+    relayerApiAssetDataPairsSchema,
+};
+
+// We need to replace the `$ref`s to be OpenAPI compliant.
+const openApiSchemas = JSON.parse(
+    JSON.stringify(usedSchemas).replace(/(\/\w+)/g, match => `#/components/schemas${match}`),
+);
+// The json schema used by OpenAPI does not accept ids
+Object.keys(openApiSchemas).forEach(key => delete openApiSchemas[key].id);
+
+export const schemas = openApiSchemas;
diff --git a/packages/sra-spec/src/md/index.ts b/packages/sra-spec/src/md/index.ts
new file mode 100644
index 000000000..076c3c45c
--- /dev/null
+++ b/packages/sra-spec/src/md/index.ts
@@ -0,0 +1,5 @@
+import { readFileSync } from 'fs';
+
+export const md = {
+    introduction: readFileSync('src/md/introduction.md').toString(),
+};
diff --git a/packages/sra-spec/src/md/introduction.md b/packages/sra-spec/src/md/introduction.md
new file mode 100644
index 000000000..6f733c9ab
--- /dev/null
+++ b/packages/sra-spec/src/md/introduction.md
@@ -0,0 +1,214 @@
+# Testing
+
+Use the [sra-report](https://github.com/0xProject/0x-monorepo/tree/development/packages/sra-report) command line tool to test your API for SRA compliance.
+
+# Schemas
+
+The [JSON schemas](http://json-schema.org/) for the API payloads and responses can be found in [@0xproject/json-schemas](https://github.com/0xProject/0x.js/tree/development/packages/json-schemas). Examples of each payload and response can be found in the library's [test suite](https://github.com/0xProject/0x.js/blob/development/packages/json-schemas/test/schema_test.ts#L1).
+
+```bash
+npm install @0xproject/json-schemas --save
+```
+
+You can easily validate your API's payloads and responses using the [@0xproject/json-schemas](https://github.com/0xProject/0x.js/tree/development/packages/json-schemas) package:
+
+```js
+import {SchemaValidator, ValidatorResult, schemas} from '@0xproject/json-schemas';
+
+const {relayerApiTokenPairsResponseSchema} = schemas;
+const validator = new SchemaValidator();
+
+const tokenPairsResponse = {
+    ...
+};
+const validatorResult: ValidatorResult = validator.validate(tokenPairsResponse, relayerApiTokenPairsResponseSchema);
+```
+
+# Pagination
+
+Requests that return potentially large collections should respond to the **?page** and **?perPage** parameters. For example:
+
+```bash
+$ curl https://api.example-relayer.com/v2/asset_pairs?page=3&perPage=20
+```
+
+Page numbering should be 1-indexed, not 0-indexed. If a query provides an unreasonable (ie. too high) `perPage` value, the response can return a validation error as specified in the [errors section](#section/Errors). If the query specifies a `page` that does not exist (ie. there are not enough `records`), the response should just return an empty `records` array.
+
+All endpoints that are paginated should return a `total`, `page`, `perPage` and a `records` value in the top level of the collection. The value of `total` should be the total number of records for a given query, whereas `records` should be an array representing the response to the query for that page. `page` and `perPage`, are the same values that were specified in the request. See the note in [miscellaneous](#section/Misc.) about formatting `snake_case` vs. `lowerCamelCase`.
+
+These requests include the [`/v2/asset_pairs`](#operation/getAssetPairs), [`/v2/orders`](#operation/getOrders), [`/v2/fee_recipients`](#operation/getFeeRecipients) and [`/v2/orderbook`](#operation/getOrderbook) endpoints.
+
+# Network Id
+
+All requests should be able to specify a **?networkId** query param for all supported networks. For example:
+
+```bash
+$ curl https://api.example-relayer.com/v2/asset_pairs?networkId=1
+```
+
+If the query param is not provided, it should default to **1** (mainnet).
+
+Networks and their Ids:
+
+| Network Id | Network Name |
+| ---------- | ------------ |
+| 1          | Mainnet      |
+| 42         | Kovan        |
+| 3          | Ropsten      |
+| 4          | Rinkeby      |
+
+If a certain network is not supported, the response should **400** as specified in the [error response](#section/Errors) section. For example:
+
+```json
+{
+    "code": 100,
+    "reason": "Validation failed",
+    "validationErrors": [
+        {
+            "field": "networkId",
+            "code": 1006,
+            "reason": "Network id 42 is not supported"
+        }
+    ]
+}
+```
+
+# Link Header
+
+A [Link Header](https://tools.ietf.org/html/rfc5988) can be included in a response to provide clients with more context about paging
+For example:
+
+```bash
+Link: <https://api.example-relayer.com/v2/asset_pairs?page=3&perPage=20>; rel="next",
+<https://api.github.com/user/repos?page=10&perPage=20>; rel="last"
+```
+
+This `Link` response header contains one or more Hypermedia link relations.
+
+The possible `rel` values are:
+
+| Name  | Description                                                   |
+| ----- | ------------------------------------------------------------- |
+| next  | The link relation for the immediate next page of results.     |
+| last  | The link relation for the last page of results.               |
+| first | The link relation for the first page of results.              |
+| prev  | The link relation for the immediate previous page of results. |
+
+# Rate Limits
+
+Rate limit guidance for clients can be optionally returned in the response headers:
+
+| Header Name           | Description                                                                  |
+| --------------------- | ---------------------------------------------------------------------------- |
+| X-RateLimit-Limit     | The maximum number of requests you're permitted to make per hour.            |
+| X-RateLimit-Remaining | The number of requests remaining in the current rate limit window.           |
+| X-RateLimit-Reset     | The time at which the current rate limit window resets in UTC epoch seconds. |
+
+For example:
+
+```bash
+$ curl -i https://api.example-relayer.com/v2/asset_pairs
+HTTP/1.1 200 OK
+Date: Mon, 20 Oct 2017 12:30:06 GMT
+Status: 200 OK
+X-RateLimit-Limit: 60
+X-RateLimit-Remaining: 56
+X-RateLimit-Reset: 1372700873
+```
+
+When a rate limit is exceeded, a status of **429 Too Many Requests** should be returned.
+
+# Errors
+
+Unless the spec defines otherwise, errors to bad requests should respond with HTTP 4xx or status codes.
+
+## Common error codes
+
+| Code | Reason                                  |
+| ---- | --------------------------------------- |
+| 400  | Bad Request – Invalid request format    |
+| 404  | Not found                               |
+| 429  | Too many requests - Rate limit exceeded |
+| 500  | Internal Server Error                   |
+| 501  | Not Implemented                         |
+
+## Error reporting format
+
+For all **400** responses, see the [error response schema](https://github.com/0xProject/0x-monorepo/blob/development/packages/json-schemas/schemas/relayer_api_error_response_schema.ts#L1).
+
+```json
+{
+    "code": 101,
+    "reason": "Validation failed",
+    "validationErrors": [
+        {
+            "field": "maker",
+            "code": 1002,
+            "reason": "Invalid address"
+        }
+    ]
+}
+```
+
+General error codes:
+
+```bash
+100 - Validation Failed
+101 - Malformed JSON
+102 - Order submission disabled
+103 - Throttled
+```
+
+Validation error codes:
+
+```bash
+1000 - Required field
+1001 - Incorrect format
+1002 - Invalid address
+1003 - Address not supported
+1004 - Value out of range
+1005 - Invalid signature or hash
+1006 - Unsupported option
+```
+
+# Asset Data Encoding
+
+As we now support multiple [token transfer proxies](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#assetproxy), the identifier of which proxy to use for the token transfer must be encoded, along with the token information. Each proxy in 0x v2 has a unique identifier. If you're using 0x.js there will be helper methods for this [encoding](https://0xproject.com/docs/0x.js#zeroEx-encodeERC20AssetData) and [decoding](https://0xproject.com/docs/0x.js#zeroEx-decodeAssetProxyId).
+
+The identifier for the Proxy uses a similar scheme to [ABI function selectors](https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI#function-selector).
+
+```js
+// ERC20 Proxy ID  0xf47261b0
+bytes4(keccak256('ERC20Token(address)'));
+// ERC721 Proxy ID 0x08e937fa
+bytes4(keccak256('ERC721Token(address,uint256)'));
+```
+
+Asset data is encoded using [ABI encoding](https://solidity.readthedocs.io/en/develop/abi-spec.html).
+
+For example, encoding the ERC20 token contract (address: 0x1dc4c1cefef38a777b15aa20260a54e584b16c48) using the ERC20 Transfer Proxy (id: 0xf47261b0) would be:
+
+```bash
+0xf47261b00000000000000000000000001dc4c1cefef38a777b15aa20260a54e584b16c48
+```
+
+Encoding the ERC721 token contract (address: `0x371b13d97f4bf77d724e78c16b7dc74099f40e84`), token id (id: `99`, which hex encoded is `0x63`) and the ERC721 Transfer Proxy (id: 0x08e937fa) would be:
+
+```bash
+0x08e937fa000000000000000000000000371b13d97f4bf77d724e78c16b7dc74099f40e840000000000000000000000000000000000000000000000000000000000000063
+```
+
+For more information see [the Asset Proxy](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#erc20proxy) section of the v2 spec and the [Ethereum ABI Spec](https://solidity.readthedocs.io/en/develop/abi-spec.html).
+
+# Meta Data in Order Responses
+
+In v2 of the standard relayer API we added the `metaData` field. It is meant to provide a standard place for relayers to put optional, custom or non-standard fields that may of interest to the consumer of the API.
+
+A good example of such a field is `remainingTakerAssetAmount`, which is a convenience field that communicates how much of a 0x order is potentially left to be filled. Unlike the other fields in a 0x order, it is not guaranteed to be correct as it is derived from whatever mechanism the implementer (ie. the relayer) is using. While convenient for prototyping and low stakes situations, we recommend validating the value of the field by checking the state of the blockchain yourself, such as by using [Order Watcher](https://0xproject.com/wiki#0x-OrderWatcher).
+
+# Misc.
+
+*   All requests and responses should be of **application/json** content type
+*   All token amounts are sent in amounts of the smallest level of precision (base units). (e.g if a token has 18 decimal places, selling 1 token would show up as selling `'1000000000000000000'` units by this API).
+*   All addresses are sent as lower-case (non-checksummed) Ethereum addresses with the `0x` prefix.
+*   All parameters are to be written in `lowerCamelCase`.
diff --git a/packages/sra-spec/src/parameters.ts b/packages/sra-spec/src/parameters.ts
new file mode 100644
index 000000000..48ffb036d
--- /dev/null
+++ b/packages/sra-spec/src/parameters.ts
@@ -0,0 +1,39 @@
+import { ParameterObject } from '@loopback/openapi-v3-types';
+export const paginationParameters: ParameterObject[] = [
+    {
+        name: 'page',
+        in: 'query',
+        description: 'The number of the page to request in the collection.',
+        example: 3,
+        schema: {
+            type: 'number',
+            default: 1,
+        },
+    },
+    {
+        name: 'perPage',
+        in: 'query',
+        description: 'The number of records to return per page.',
+        example: 10,
+        schema: {
+            type: 'number',
+            default: 100,
+        },
+    },
+];
+
+export const networkdIdParameter: ParameterObject = {
+    name: 'networkId',
+    in: 'query',
+    description: 'The id of the Ethereum network',
+    example: 42,
+    schema: {
+        type: 'number',
+        default: 1,
+    },
+};
+
+export const generateParameters = (parameters: ParameterObject[], isPaginated: boolean = false): ParameterObject[] => {
+    const optionalParameters = isPaginated ? paginationParameters : [];
+    return [...parameters, networkdIdParameter, ...optionalParameters];
+};
diff --git a/packages/sra-spec/src/responses.ts b/packages/sra-spec/src/responses.ts
new file mode 100644
index 000000000..cd7352058
--- /dev/null
+++ b/packages/sra-spec/src/responses.ts
@@ -0,0 +1,24 @@
+import { ResponsesObject } from '@loopback/openapi-v3-types';
+
+import { errorResponses } from './errors';
+import { headers } from './headers';
+
+export const generateResponses = (schemaName?: string, example?: any, description: string = 'OK'): ResponsesObject => {
+    const responses = {
+        '200': {
+            headers,
+            description,
+            content: {},
+        },
+        ...errorResponses,
+    };
+    if (schemaName) {
+        responses['200'].content = {
+            'application/json': {
+                schema: { $ref: `#/components/schemas/${schemaName}` },
+                example,
+            },
+        };
+    }
+    return responses;
+};