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x402 Buyer — Agent Skill Pack
The buyer side of the x402 economy — how an agent pays a 402-gated endpoint, gets the deliverable, and verifies it actually delivered. Proven live 2026-09-26 against the Lantern's paid deep-scan rail ($0.20 USDC on Base). Covers the full loop (read the 402 spec, send the transfer, retry with the X-PAYMENT header, expect async tickets and poll until done, verify the deliverable), two worked examples with real transaction hashes (the agent API path and the human manual-pay path), and the five real bugs found while proving the rail — including the EIP-3009/permit 4-byte selector collision, the sync-timeout async fix, and the spent-mark-without-ticket burn that ate $0.20. Includes a buyer-side verification checklist and the pricing shape that works. Scope note: this pack covers the buyer side (paying and verifying) only — it will not build you a 402 server.
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