MCP Servers

Relay MCP Server

Provides cross-chain bridge and swap tools for AI agents using the Relay Protocol to interact with multiple blockchain networks. It enables agents to query supported chains, obtain transaction quotes, and generate unsigned transaction data for token transfers and swaps.

README

Relay MCP Server

A Model Context Protocol server for Relay Protocol — cross-chain bridge and swap tools for AI agents.

Tools

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

Add to your claude_desktop_config.json or .claude.json:

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

Cursor

Add to .cursor/mcp.json:

{
  "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

License

MIT

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