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 |
execute_bridge |
Get unsigned transaction data for execution |
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
- API: Direct HTTP calls to
api.relay.link(no SDK dependency) - Signing: The server returns unsigned transactions. Your agent's wallet infrastructure (Privy, Dynamic, Turnkey, etc.) handles signing and broadcasting.
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 for confirmation
4. Agent calls execute_bridge → gets unsigned transaction + requestId
5. Agent signs and broadcasts tx via wallet infrastructure
6. Agent calls get_transaction_status(requestId) → polls until success
7. Agent confirms completion to user
License
MIT
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