x402 V1 → V2 Migration Guide
Field notes from migrating a live, payment-gated API from x402 V1 to V2 on Base mainnet — the undocumented gotchas, working code from a service in production, and a checklist at the bottom.
Written from — three payment-gated AI inference endpoints on Base mainnet, self-hosted and settling real USDC via the Coinbase CDP facilitator. LinkedIn
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