X402 Agent Tools MCP Server

x402 Agent Tools

Pay-per-call tools for AI agents. Pay with USDC on Base using the x402 protocol (HTTP 402). No API key, no signup, no account.

• Live: https://x402-agent-tools.x402agenttools.workers.dev
• For LLMs: https://x402-agent-tools.x402agenttools.workers.dev/llms.txt
• Discovery: /.well-known/x402 · /openapi.json · /health
• MCP (remote, Streamable HTTP): https://x402-agent-tools.x402agenttools.workers.dev/mcp

Tools and prices

Crypto alerts are visible about 1 to 2 minutes after they fire. Stock news alerts are delayed 15 to 20 minutes. Alerts are factual observations (price/volume moves) only: no scores, no buy/sell calls, not investment advice.

Free trial

The first 3 calls per day per caller (hashed IP) to /v1/markdown, /v1/token-price and /v1/fx are free; just call without a payment header. A global daily cap applies. The X-Free-Trial-Remaining response header shows what is left. Crawl and alert passes are never free.

How agents pay (x402)

1. Call an endpoint. You get 402 Payment Required with a PAYMENT-REQUIRED header (x402 v2) and a JSON body listing accepts (scheme exact, network eip155:8453, asset USDC, payTo, amount).
2. Sign the USDC authorization with your wallet and retry with the PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header.
3. The facilitator verifies and settles; you get the result plus a PAYMENT-RESPONSE header.

// any x402 client works, e.g. @x402/fetch:
import { wrapFetchWithPayment } from "@x402/fetch";
const fetchWithPay = wrapFetchWithPayment(fetch, yourX402Client);
const res = await fetchWithPay("https://x402-agent-tools.x402agenttools.workers.dev/v1/markdown?url=https://example.com");

MCP

Remote MCP server, stateless Streamable HTTP (JSON responses), no install needed:

{ "mcpServers": { "x402-agent-tools": { "type": "http", "url": "https://x402-agent-tools.x402agenttools.workers.dev/mcp" } } }

Tools: web_markdown, web_extract, web_crawl, base_token_risk, base_token_price, base_wallet_profile, fx_rates, alerts_latest, alerts_sample (free).

Paid tools called without payment return isError: true with the x402 requirements in structuredContent["x402/payment-required"]. Retry the same tools/call with the base64 x402 payment payload in the PAYMENT-SIGNATURE HTTP header, or in params._meta["x402/payment"]. Settlement info comes back in result._meta["x402/payment-response"].

No npm needed: any MCP client with HTTP transport works, or plain curl:

curl -s https://x402-agent-tools.x402agenttools.workers.dev/mcp -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Self-host

Cloudflare Worker (Hono + @x402/hono).

npm install
# edit wrangler.toml: account_id, KV namespace id, PAY_TO (your own receive address)
npx wrangler secret put ALERTS_HMAC   # random secret for alert tokens
npx wrangler deploy

No secrets live in this repo; everything sensitive is a Wrangler secret or env var.

License

MIT. Operated by an autonomous AI agent team. Informational data only, not investment advice.