mdapi-mcp — MCP server for https://md.fastdb.in

Exposes the paid mdapi endpoints as MCP tools, with x402 pay-per-call ($0.005 in USDC on Base, no signup, no API key):

Failed calls are never charged — settlement happens only after the tool succeeds.

Two ways to use it

1. Remote MCP server (recommended)

Streamable HTTP endpoint: https://md.fastdb.in/mcp Listed in the official MCP registry as in.fastdb.md/mdapi.

Payments are in-protocol x402 v2 (the official @x402/mcp pattern): an unpaid tools/call returns the payment requirements; an x402-aware MCP client signs a USDC transferWithAuthorization and retries with the payment in _meta. No ETH needed — the facilitator sponsors gas.

import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js";
import { createx402MCPClient } from "@x402/mcp";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = createx402MCPClient({
  name: "my-agent", version: "1.0.0",
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(privateKeyToAccount(process.env.EVM_PRIVATE_KEY)) }],
  autoPayment: true,
});
await client.connect(new StreamableHTTPClientTransport(new URL("https://md.fastdb.in/mcp")));
const result = await client.callTool("html_to_markdown", { url: "https://example.com" });

server.js is this remote server. It runs conversion in-process (same ../lib as the HTTP API) and verifies/settles via the Coinbase CDP facilitator. Deployed as systemd unit biz-mdapi-mcp on 127.0.0.1:8403 behind nginx /mcp.

2. Local stdio server (Claude Desktop and other vanilla MCP clients)

stdio.js runs on your machine with your wallet key and wraps the live paid HTTP API: it answers the HTTP 402 challenge for you (x402 v1 X-PAYMENT flow via x402-fetch). Install straight from the tarball we host:

// Claude Desktop / any MCP client config
{
  "mcpServers": {
    "mdapi": {
      "command": "npx",
      "args": ["-y", "https://md.fastdb.in/mcp/mdapi-mcp.tgz"],
      "env": { "EVM_PRIVATE_KEY": "0x..." } // wallet holding USDC on Base
    }
  }
}

Env: EVM_PRIVATE_KEY (required), MDAPI_BASE_URL (optional override). Per-call spend is hard-capped at 0.01 USDC in the client wrapper.

Related MCP server: mercury-x402-mcp

Discovery

• Official MCP registry: in.fastdb.md/mdapi (remote, streamable-http)

• x402 Bazaar (Coinbase CDP discovery layer): https://md.fastdb.in/md and /extract are indexed; agents using the Bazaar MCP server (https://api.cdp.coinbase.com/platform/v2/x402/discovery/mcp) can find and call them there too.

• Machine-readable catalog: GET https://md.fastdb.in/ (JSON for non-browsers)

Repo layout

• server.js — remote MCP server (x402 v2 in-protocol payments, CDP facilitator). Reference: it imports mdapi's core ../lib, which lives in the main mdapi codebase and is not vendored here — stdio.js is the fully self-contained entry.

• stdio.js — local stdio MCP server (pays the HTTP API with your key)

• server.json — MCP registry manifest