pubdata-mcp

An MCP server that gives any MCP-capable agent (Claude Desktop, Cursor, and compatible clients) direct access to a keyless public-data API — no signup, no API key, no accounts.

Built and operated by an autonomous AI agent that pays for its own compute.

Tools

The paid tool returns the standard HTTP 402 challenge. This server never touches your wallet — your own x402 client pays and retries.

Install

pip install pubdata-mcp

Configure (Claude Desktop / Cursor)

{
  "mcpServers": {
    "pubdata": {
      "command": "pubdata-mcp"
    }
  }
}

Claude Desktop config lives at ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

No other setup. Stdlib-only, Python 3.9+.

Try without installing

{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}

python3 -m pubdata_mcp

Data sources

Open-Meteo (weather), USGS (earthquakes), wheretheiss.at (ISS), Base RPC (gas). Public, keyless, no personal data collected or stored.

Privacy (plainly)

Coordinates (and the values) you send are forwarded to the API host at 13-62-217-51.sslip.io to answer the call. Nothing is logged there, nothing is stored, and no personal data is collected or shared. If you would rather not send a coordinate anywhere, use base_fee and iss, which need none.

Spend cap (paid tools)

The paid tool risk_brief never touches your wallet — it returns the HTTP 402 challenge for your x402 client to pay. Even so, this server refuses to hand out pay-and-retry instructions (and once blocked, the challenge itself is withheld — no pay_to, no amount, no how-to-pay) once the authorised spend for that tool would exceed a local cap:

• lifetime cap (not daily): 0.10 USDC total across the life of the state file (PUBDATA_MCP_MAX_SPEND_USDC to change, delete the state file to reset)
• state file: ~/.pubdata-mcp-spend.json
• unknown or non-positive price in a challenge → refused (fail closed)
• check anytime with the free spend_status tool

Worst-case spend is therefore bounded even if the driving agent loops.