@cowprotocol/cow-sdk

CoW protocol SDK

⚠️⚠️ THE SDK IS IN Beta ⚠️⚠️ It is being currently develop and is a work in progress, also it's API is subjected to change. If you experience any problems, please open an issue in Github trying to describe your problem.

Getting started

Install the SDK:

yarn add @cowprotocol/cow-sdk

Instantiate the SDK:

import { CowSdk } from 'cow-sdk'

const chainId = 4 // Rinkeby
const cowSdk = new CowSdk(chainId)

The SDK will expose the CoW API operations (cowSdk.cowApi) and some convenient method that will facilitate signing orders (cowSdk.signOrder). Future version will provide easy access to The Graph data and some other convenient utils.

// i.e. Get last 5 orders for a given trader
const trades = await cowSdk.cowApi.getOrders({
  owner: '0x00000000005ef87f8ca7014309ece7260bbcdaeb', // Trader
  limit: 5,
  offset: 0
})
console.log(trades)

Let's see a full example on how to submit an order to CowSwap.

⚠️ Before starting, the protocol requires you to approve the sell token before the order can be considered. For more details see https://docs.cow.fi/tutorials/how-to-submit-orders-via-the-api/1.-set-allowance-for-the-sell-token

In this example, we will:

• 1. Instantiate the SDK and a wallet: Used for signing orders
• 1. Get a price/fee quote from the API: Get current market price and required protocol fee to settle your trade.
• 1. Sign the order using your wallet: Only signed orders are considered by the protocol.
• 1. Post the signed order to the API: Post the order so it can be executed.

import { Wallet } from 'ethers'
import { CowSdk, OrderKind } from 'cow-sdk'

// 1. Instantiate wallet and SDK
const mnemonic = 'fall dirt bread cactus...'
const wallet = Wallet.fromMnemonic(mnemonic)
const cowSdk = new CowSdk(4, { signer: wallet })

// 2. Get a price/fee quote from the API
//    It will return the price and fee to "Sell 1 ETH for USDC"
const quoteResponse = await cowSdk.cowApi.getQuote({
  kind: OrderKind.SELL, // Sell order (could also be BUY)
  sellToken: '0xc778417e063141139fce010982780140aa0cd5ab', // WETH
  buyToken: '0x4dbcdf9b62e891a7cec5a2568c3f4faf9e8abe2b',  // USDC
  amount: '1000000000000000000', // 1 WETH
  userAddress: '0x1811be0994930fe9480eaede25165608b093ad7a', // Trader
  validTo: 2524608000,
})

const { sellToken, buyToken, validTo, buyAmount, sellAmount, receiver, feeAmount } = quoteResponse.quote
const order = {
  kind: OrderKind.SELL,
  partiallyFillable: false, // Allow partial executions of an order (true would be for a "Fill or Kill" order, which is not yet supported but will be added soon)
  sellToken,
  buyToken,
  validTo,
  buyAmount,
  sellAmount,
  receiver,
  feeAmount,
}

// 3. Sign the order using your wallet
const signedOrder = await cowSdk.signOrder(order)

// 4. Post the signed order to the API
const orderId = await cowSdk.cowApi.sendOrder({
  order: { ...order, ...signedOrder },
  owner: '0x1811be0994930fe9480eaede25165608b093ad7a',
})

// We can inspect the Order details in the CoW Protocol Explorer
console.log(`https://explorer.cow.fi/rinkeby/orders/${orderId}`)

Install Dependencies

yarn

Build

yarn build

# Build in watch mode
yarn start

Unit testing

yarn test