mercury-x402-mcp

17 keyless, signed-provenance web-data tools your AI agent can pay for itself — over x402 on Base mainnet (USDC). No Mercury API key, no account, no signup. Your agent calls a tool, it pays the SKU with your wallet, and gets back the result plus an EIP-191 provenance receipt it can verify offline, forever.

Tools include: clean fetch, LLM-ready markdown, structured extract, link graph, robots, diff, notarize, headers, table extract, feed, availability, validate, batch, sitemap, DNS, readability, redirect — built live from Mercury's catalog, so the list is always current.

Install

Terminal

npx mercury-x402-mcp

Add to your MCP host (Claude Desktop / Cursor / Cline / any MCP client):

config.json

{
  "mcpServers": {
    "mercury": {
      "command": "npx",
      "args": ["-y", "mercury-x402-mcp"],
      "env": {
        "MERCURY_PRIVATE_KEY": "0xYOUR_BASE_MAINNET_WALLET_KEY"
      }
    }
  }
}

MERCURY_PRIVATE_KEY is your Base-mainnet wallet (funded with a little USDC). Mercury is keyless — the only thing you bring is a wallet to pay per call. Tools cost ~$0.003–$0.02 each.

The mercury_catalog and mercury_verify tools work without a wallet (free).

Why

Firecrawl / Jina / Tavily all gate behind a human-created API key + a credit-card plan — an agent can't onboard itself. Mercury can: an agent discovers the tools, pays over x402, and every result is cryptographically signed so the bytes are provably genuine and untampered — what RAG, trading, and agent-to-agent commerce actually need.

Discovery: https://mercury-x402-jed.fly.dev/.well-known/x402 · https://mercury-x402-jed.fly.dev/llms.txt