Tool	Description
`get_supported_chains`	List supported blockchain networks
`get_supported_tokens`	Search for tokens across chains
`get_bridge_quote`	Quote for bridging same token across chains
`get_swap_quote`	Quote for swapping between different tokens
`estimate_fees`	Fee breakdown for a bridge or swap
`get_transaction_status`	Check status of a relay transaction
`get_transaction_history`	Past transactions for a wallet
`get_relay_app_url`	Deep link to the Relay web app with pre-filled parameters

Usage

Claude Desktop / Claude Code

{
  "mcpServers": {
    "relay": {
      "command": "npx",
      "args": ["-y", "@relayprotocol/relay-mcp"]
    }
  }
}

Run from source

npm install
npm run build
npm start

Environment variables

Variable	Default	Description
`RELAY_API_URL`	`https://api.relay.link`	Relay API base URL
`RELAY_API_KEY`	—	Optional API key for higher rate limits

Architecture

Transport: Stdio (MCP spec)
Runtime: Node.js >=20
API: Direct HTTP calls to api.relay.link (no SDK dependency)
Read-only: Returns quotes, fees, and status. Does not sign or broadcast transactions.

Agent flow example

User: "Bridge 0.1 ETH from Ethereum to Base"

1. Agent calls get_supported_chains → resolves Ethereum=1, Base=8453
2. Agent calls get_bridge_quote → gets quote with fees and ETA
3. Agent shows user the quote and a link to execute on relay.link