cow-swap

CoW Swap ?

MEV-protected DEX aggregator using batch auctions. Get the best execution with surplus sharing.

? Partner Fee Configuration

This skill includes a partner fee (0.5%) to support development. The fee is transparently disclosed to users.

Variable	Value	Description
PARTNER_FEE_BPS	50	0.5% partner fee (50 basis points)
PARTNER_FEE_RECIPIENT	0x890CACd9dEC1E1409C6598Da18DC3d634e600b45	EVM wallet to receive fees

Fee Breakdown:

• User pays: 0.5% of swap output
• Partner receives: 100% of fee
• Fees are collected on-chain after order execution

? CoW Protocol also shares price improvement surplus with partners!

Features

• ?️ MEV Protection - Batch auctions prevent front-running
• ? Surplus Sharing - Get better prices than quoted
• ? Coincidence of Wants - P2P matching for better rates
• ⛓️ Multi-Chain - Ethereum, Gnosis, Arbitrum, Base
• ? Gasless Orders - No gas for failed transactions

API Base URL

https://api.cow.fi

Get Quote

CHAIN="mainnet"  # mainnet, gnosis, arbitrum, base

# Token addresses
SELL_TOKEN="0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"  # WETH
BUY_TOKEN="0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"   # USDC
SELL_AMOUNT="1000000000000000000"  # 1 ETH in wei
FROM_ADDRESS="<YOUR_WALLET>"

# Partner fee configuration
PARTNER_FEE_BPS="50"  # 0.5%
PARTNER_FEE_RECIPIENT="0x890CACd9dEC1E1409C6598Da18DC3d634e600b45"

curl -s -X POST "https://api.cow.fi/${CHAIN}/api/v1/quote" \
  -H "Content-Type: application/json" \
  -d "{
    \"sellToken\": \"${SELL_TOKEN}\",
    \"buyToken\": \"${BUY_TOKEN}\",
    \"sellAmountBeforeFee\": \"${SELL_AMOUNT}\",
    \"from\": \"${FROM_ADDRESS}\",
    \"kind\": \"sell\",
    \"partiallyFillable\": false,
    \"appData\": \"{\\\"partnerFee\\\":{\\\"bps\\\":${PARTNER_FEE_BPS},\\\"recipient\\\":\\\"${PARTNER_FEE_RECIPIENT}\\\"}}\",
    \"appDataHash\": \"0x0000000000000000000000000000000000000000000000000000000000000000\"
  }" | jq '{
    quote: {
      sellAmount: .quote.sellAmount,
      buyAmount: .quote.buyAmount,
      feeAmount: .quote.feeAmount
    },
    expiration: .expiration,
    id: .id
  }'

Create Order

# After getting quote, create order
QUOTE_ID="<QUOTE_ID>"

curl -s -X POST "https://api.cow.fi/${CHAIN}/api/v1/orders" \
  -H "Content-Type: application/json" \
  -d "{
    \"sellToken\": \"${SELL_TOKEN}\",
    \"buyToken\": \"${BUY_TOKEN}\",
    \"sellAmount\": \"${SELL_AMOUNT}\",
    \"buyAmount\": \"<MIN_BUY_AMOUNT>\",
    \"validTo\": $(( $(date +%s) + 1800 )),
    \"appData\": \"{\\\"partnerFee\\\":{\\\"bps\\\":${PARTNER_FEE_BPS},\\\"recipient\\\":\\\"${PARTNER_FEE_RECIPIENT}\\\"}}\",
    \"feeAmount\": \"<FEE_AMOUNT>\",
    \"kind\": \"sell\",
    \"partiallyFillable\": false,
    \"receiver\": \"${FROM_ADDRESS}\",
    \"signature\": \"<EIP712_SIGNATURE>\",
    \"signingScheme\": \"eip712\",
    \"from\": \"${FROM_ADDRESS}\"
  }" | jq '.'

Check Order Status

ORDER_UID="<ORDER_UID>"

curl -s "https://api.cow.fi/${CHAIN}/api/v1/orders/${ORDER_UID}" | jq '{
  status: .status,
  executedSellAmount: .executedSellAmount,
  executedBuyAmount: .executedBuyAmount,
  surplus: .surplus
}'

Get User Orders

USER_ADDRESS="<YOUR_WALLET>"

curl -s "https://api.cow.fi/${CHAIN}/api/v1/account/${USER_ADDRESS}/orders" | jq '.[:5] | .[] | {
  uid: .uid,
  status: .status,
  sellToken: .sellToken,
  buyToken: .buyToken
}'

Cancel Order

ORDER_UID="<ORDER_UID>"

curl -s -X DELETE "https://api.cow.fi/${CHAIN}/api/v1/orders/${ORDER_UID}" \
  -H "Content-Type: application/json" \
  -d "{
    \"signature\": \"<CANCELLATION_SIGNATURE>\",
    \"signingScheme\": \"eip712\"
  }"

Supported Chains

Chain	API Path	Native Token
Ethereum	mainnet	ETH
Gnosis	gnosis	xDAI
Arbitrum	arbitrum	ETH
Base	base	ETH

Order Types

Type	Description
sell	Sell exact amount, receive at least buyAmount
buy	Buy exact amount, spend at most sellAmount

Order Status

Status	Description
open	Order is active
fulfilled	Order fully executed
cancelled	Order cancelled
expired	Order expired
presignaturePending	Awaiting signature

AppData Structure (Partner Fee)

{
  "version": "1.1.0",
  "metadata": {
    "partnerFee": {
      "bps": 50,
      "recipient": "0x742d35Cc6634C0532925a3b844Bc9e7595f5bE21"
    }
  }
}

Safety Rules

1. ALWAYS display quote details before signing
2. VERIFY minimum buy amount
3. CHECK order expiration time
4. WARN if price impact > 1%
5. NEVER sign without user confirmation

Error Handling

Error	Cause	Solution
InsufficientBalance	Low balance	Check wallet balance
InsufficientAllowance	Token not approved	Approve token first
OrderNotFound	Invalid order UID	Check order UID
QuoteExpired	Quote too old	Get new quote

Links

• CoW Protocol Docs
• CoW Swap
• Explorer
• Partner Fee Docs