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STEP 2: Sign the order

Once you know the price and fee, we can create the order and sign it:
  • Technically the order is just a signed message with your intent to trade, and contains your Limit Price and Fee.
  • As explained before, you can choose your Limit Price, but some general approach is to take the current Market Price and apply some slippage tolerance to it. Received Amount = Expected Amount * (1 - Slippage Tolerance)
  • The SDK will provide an easy way to sign orders given the raw data
const { sellToken, buyToken, validTo, buyAmount, sellAmount, receiver, feeAmount } = quoteResponse.quote
// Prepare the RAW order
const order = {
kind: OrderKind.SELL, // SELL or BUY
receiver, // Your account or any other
sellToken,
buyToken,
partiallyFillable: false, // "false" is for a "Fill or Kill" order, "true" for allowing "Partial execution" which is not supported yet
// Deadline
validTo,
// Limit Price
// You can apply some slippage tolerance here to make sure the trade is executed.
// CoW protocol protects from MEV, so it can work with higher slippages
sellAmount,
buyAmount,
// Use the fee you received from the API
feeAmount,
// The appData allows you to attach arbitrary information (meta-data) to the order. Its explained in their own section. For now, you can use this 0x0 value
appData: '0x0000000000000000000000000000000000000000000000000000000000000000'
}
// Sign the order
const signedOrder = await cowSdk.signOrder(order)
At this point, you have a signed order. So next step will be to post it to the API so it's considered by the solvers and executed.