Overview
Before paying an x402 endpoint or connecting to an MCP server, check it: alive, real price and payTo vs its public listing, OFAC and stablecoin issuer-freeze screening, MCP tool changes. Fresh live check with a signed receipt in a public C2SP transparency log; offer and receipt signed (x402 offer-receipt v0.6, did:web:alalanet.com). GET /x402/check?url=<endpoint>. $0.002 USDC on Base or Solana, settled via the Coinbase CDP facilitator. Free API (preflight allow/hold/block, payment status after a timeout, dispute evidence) and remote MCP at https://alalanet.com/mcp.