Bridge Watch

Zero-dependency MCP stdio bridge for the Bridge Watch server: 104,209 on-chain address labels (Base / Ethereum), funding-cluster and CCTP tracing, transaction explanation, plus 7 metered tools paid per call over x402 in USDC on Base.

Node >= 18. No dependencies, no build step, ~10 KB.

Install / run

npx -y bridge-watch-mcp --tools        # print the live tool list (server reachability check)
npx -y bridge-watch-mcp                # run the stdio bridge (this is what MCP clients call)

MCP client config (Claude Desktop, Cursor, Windsurf, Cline, ...):

{
  "mcpServers": {
    "bridge-watch": {
      "command": "npx",
      "args": ["-y", "bridge-watch-mcp"]
    }
  }
}

Free tier

Every IP gets 3 free tool calls per day, no key and no wallet required. get_label accepts no arguments and returns a real demo result, so a fresh client can see working data on the very first call:

{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"get_label","arguments":{}}}

Paying

1. Send USDC (Base) to 0x381cdbb664608bf7b1dd4f9403a572c1c57332c2.
2. Reuse that same address as the credential:

BRIDGE_WATCH_BEARER=0xYourPayerAddress npx -y bridge-watch-mcp

Live per-call prices are published by the server itself — ask the model to call list_paid_endpoints, or read https://agentsapi.top/.well-known/x402. Prices are never hardcoded in this package.

Environment

How it works

Reads newline-delimited JSON-RPC on stdin, POSTs each message to the remote Streamable HTTP endpoint, and writes back the (SSE-unwrapped) JSON-RPC responses. Notifications (202 Accepted) produce no output. Nothing is logged, nothing is persisted, and the process exits as soon as stdin closes and every in-flight request is answered.

Remote-first alternative

You do not need this package if your client speaks HTTP: point it at https://agentsapi.top/mcp directly.

License

MIT

0.1.2 (R218, 2026-10-13)

• Fixed LSP Content-Length framing on stdin: the previous newline-splitting parser glued a payload to the next frame header, which made the bridge forward invalid JSON (server answered HTTP 400 / JSON-RPC -32700) or silently drop messages.
• Anonymous free tier is now 1 call per tool per IP per day across all 7 tools.