x402 payment preflight for agents: verify payment requirements before signing. Send a received HTTP 402 PaymentRequirements and get a deterministic payment policy decision — ALLOW, DENY or REVIEW — with a signed decision receipt (Ed25519) bound to url, method, body hash, amount, asset, chain and payTo. Agent payment safety against USDC payment risk: wrong chain, wrong asset, unexpected payTo, amount over cap, expired offer, replay. Never signs or executes a payment. Not legal advice.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.003000 USDC | 0x11f5...125D |