Mercury402: Treasury/FRED financial data over x402

io.github.dudman1/mercury402-mcp

Treasury/FRED financial data over x402: pay-per-call US yields, macro and forex in USDC on Base

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Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "mercury402-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mercury402-mcp@0.1.4"
      ],
      "env": {
        "MERCURY402_PAYER_PRIVATE_KEY": "<your MERCURY402_PAYER_PRIVATE_KEY>",
        "MERCURY402_MAX_PRICE_USD": "0.5"
      }
    }
  }
}
Environment variables
  • MERCURY402_PAYER_PRIVATE_KEYsecretOpt-in paid mode: private key of a dedicated low-balance wallet holding USDC on Base. Leave unset for free discovery mode.
  • MERCURY402_MAX_PRICE_USDPer-call spending cap in USD for paid mode.

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
0.1.4
Registry
active
Published
10/26/2026

Remotes

  • streamable-httphttps://mcp.mercury402.com/mcp

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