Watchtower — Compliance & Data-Integrity MCP Server for AI Agents

Live hosted MCP endpoint: https://watchtower-api.com/mcp · Docs: https://watchtower-api.com/docs · OpenAPI: https://watchtower-api.com/openapi.json

Watchtower is a deterministic compliance & data-integrity API for AI agents. Point any MCP client at the hosted endpoint and your agent gets tools for sanctions screening, KYB, identifier validation, jurisdiction risk, PII/secret detection, and LEI resolution — pay per call with x402 (USDC on Base, no signup) or a prepaid API key.

This repo is the public home for the hosted Watchtower MCP server. There's nothing to install — connect to the remote endpoint below.

Connect

{
  "mcpServers": {
    "watchtower": { "url": "https://watchtower-api.com/mcp" }
  }
}

Streamable-HTTP MCP, stateless — no auth handshake. Paid tools take an api_key argument (create one for free with the create_api_key tool, which includes trial credit) or you can pay per call via x402.

Tools

Why Watchtower

• Deterministic & auditable — same query + same list snapshot ⇒ byte-identical result, stamped with a content-hash and algorithm version, plus point-in-time (as_of) screening for "what did the list say when we onboarded them?"
• Broad, authoritative coverage — 10 official government lists, ~229,000 parties, refreshed daily.
• Built for agents — pay-per-call via x402 (USDC on Base, no account) or MCP; no minimums, no seats.

Also available as REST + x402

Everything above is also a REST API. Pay per call in USDC via x402 with no signup:

import { wrapFetchWithPayment, x402Client } from '@x402/fetch';
import { ExactEvmScheme } from '@x402/evm';
const pay = wrapFetchWithPayment(fetch,
  new x402Client().register('eip155:8453', new ExactEvmScheme(signer)));
await pay('https://watchtower-api.com/v1/screen', { method: 'POST',
  headers: { 'content-type': 'application/json' }, body: JSON.stringify({ name: 'Vladimir Putin' }) });

Full reference: https://watchtower-api.com/docs · machine-readable: /llms.txt, /openapi.json, /.well-known/x402.json

Informational screening against public sanctions, export-control & exclusion lists; LEI/entity data via GLEIF. Not legal advice.