CoW MCP

Overview

CoW MCP is a community-built (MIT-licensed) MCP server for CoW Protocol, available hosted or run locally. It exposes tools for swap quotes, supported-chain and token lookup, wallet trade history, and building EIP-712 order and cancellation payloads for external wallet signing. An agent builder plugs it in to give an agent intent-based, MEV-protected trading on CoW Protocol without integrating the CoW APIs directly. Not maintained by the CoW Protocol team.

Tool inventory — 11 tools, probed live 2026-07-14

• cow_get_quote — Indicative price + fee for a swap. Returns sellAmount, buyAmount, feeAmount, validTo, quoteId. Throws InvalidRequest on unknown/ambiguous symbol, unsupported chainId, or malformed address; InternalErr
• cow_get_order — Returns full order state — status, executed amounts, validTo, settlement tx if filled. Addresses are EIP-55 checksummed. Throws InvalidRequest if the uid is malformed or not found, or chainId is unsup
• cow_get_trades — Trades for an owner address. Server-side paginated via `limit` (default 25, max 100) and `offset` (default 0); walk older trades by incrementing offset. Each trade includes blockNumber and EIP-55 chec
• cow_list_chains — Every chain CoW Protocol supports. Use the chainId field on other tools.
• cow_list_tokens — Per-chain token list (symbol, name, decimals, logo) sourced from CoW's CoinGecko + Uniswap mirrors, filtered by optional symbol/name/address search. Returns empty array when no tokens match (not an er
• cow_build_order — Convert a quote (or raw amounts) into the EIP-712 payload the host wallet must sign. Bakes in appData, applies slippage to the quote (sell orders shrink buyAmount; buy orders grow sellAmount), and set
• cow_submit_order — Post a signed order to the CoW orderbook. Pass the order fields exactly as built by cow_build_order, plus the signature your wallet produced over the typedData. Returns { uid }. Hosts that advertise `
• cow_build_cancellation — Returns the EIP-712 payload for an off-chain order cancellation. Sign it with the same wallet that placed the order, then call cow_submit_cancellation. Server does not sign or store keys.
• cow_submit_cancellation — Post a signed off-chain cancellation. Returns { ok: true } on success. Hosts that advertise `elicitation` capability are prompted to confirm before submission. Throws InvalidRequest on signature misma
• cow_check_approval — Reads on-chain allowance(owner, vaultRelayer) for a sell token. Returns { approved, allowance, spender }. Use this before cow_build_order; if not approved, call cow_build_approval to get calldata for
• cow_build_approval — Returns { to, data, value } for a host wallet to submit on-chain. Default amount is unlimited (uint256 max). Server does not broadcast.

Live probe verifies the interface responds — not what the tools do, their safety, or their output quality.

Where CoW MCP fits

Related concepts: How Agents Interact With Smart Contracts, How Agents Use Wallets, What Are Onchain Agents?