Payment-firewall API for AI agents: any agent can screen a transaction (signature, chain, amount, recipient, known-bad address lists) for $0.20 USDC per call via the x402 protocol - the agent pays in the same HTTP request that carries the question, no API key, no signup. Live endpoint returns a protocol-standard 402 challenge. Also sanctions screening at $0.05/call. Built for the moment when your agent is about to sign something and you want an independent second opinion, machine-payable. Comments URL: https://news.ycombinator.com/item?id=50443889 Points: 1

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