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Relay

Official registry Finance and payments

Cross-chain bridge and swap quotes, fee estimation, and transaction tracking via Relay Protocol.

Source code Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @relayprotocol/relay-mcp
Claude Code 
claude mcp add relay -e 'RELAY_API_KEY=<your relay_api_key>' -e 'RELAY_API_URL=<RELAY_API_URL>' -- npx -y @relayprotocol/relay-mcp@0.1.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "relay": {
            "command": "npx",
            "args": [
                "-y",
                "@relayprotocol/relay-mcp@0.1.0"
            ],
            "env": {
                "RELAY_API_KEY": "<your relay_api_key>",
                "RELAY_API_URL": "<RELAY_API_URL>"
            }
        }
    }
}

Environment variables

  • RELAY_API_KEY secret Optional API key for higher rate limits
  • RELAY_API_URL Relay API base URL (default: https://api.relay.link)

Frequently asked questions

What is Relay?

Cross-chain bridge and swap quotes, fee estimation, and transaction tracking via Relay Protocol.

How do I install Relay?

It runs on your machine. In Claude Code: claude mcp add relay -e 'RELAY_API_KEY=<your relay_api_key>' -e 'RELAY_API_URL=<RELAY_API_URL>' -- npx -y @relayprotocol/relay-mcp@0.1.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Relay need an API key?

Yes. It expects RELAY_API_KEY, which you set in its configuration.

Is Relay open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains Relay?

It is published by reservoirprotocol. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.