#跨链基础设施与互操作 The update logic of x402 V2 is very clear—upgrading from single precise payments to a universal payment layer, with core improvements across three dimensions.

First, looking at the identity mechanism, the wallet-based binding scheme can directly reduce call costs, saving gas consumption from repeated authorizations, which is particularly significant for high-frequency payment scenarios. Second, the introduction of modular SDK addresses cross-chain adaptation pain points, supporting custom networks and payment schemes, lowering the integration threshold for developers—this direction is crucial for ecosystem development. Finally, expanding multi-chain + fiat payments based on the CAIP standard indicates that they are doing more than just a technical upgrade; they are building a truly cross-chain payment infrastructure.

From an on-chain perspective, the value of such infrastructure is often reflected in the subsequent ecosystem capacity. If the protocol itself is sufficiently versatile and the SDK modular enough, more applications will integrate in the future, which will directly drive related on-chain interaction data and capital flows. In the short term, focus on the growth of contract calls for this protocol; in the medium term, see who will lead in deep integration—such signals are often more valuable than official partnership announcements.