Writing about machine payments, backend systems, blockchain infrastructure, protocol design, and practical engineering.https://philpher0x.dev/en-ushttps://philpher0x.dev/posts/x402-vs-mpp-machine-payments/https://philpher0x.dev/posts/x402-vs-mpp-machine-payments/A technical comparison of x402 and MPP — where they overlap, where they differ, and what we should care about when building paid APIs.Wed, 08 Apr 2026 00:00:00 GMT