The next wave of hype for x402 is on the way, and Solana will still be the main battlefield. Core content of the x402 v2 upgrade: Wallet identity and reusable sessions (Reusable Sessions / SIWx): Content: Introduced a mechanism similar to "login". Users or AI agents only need to verify their wallet identity once to create a "session". Change: Subsequent API calls can directly reuse this session for charges, without needing to perform on-chain signatures or payment interactions each time. This greatly reduces latency and gas costs, making high-frequency API calls possible. Unified Payment Interface: Content: Established a standardized payment format, regardless of whether the assets are on Base, Solana, or other L2s, or even through traditional banking networks, developers use a unified interface. Change: Developers no longer need to write specific logic for different chains (for example, no longer needing to separately handle the differences between Solana's SPL Token and EVM's ERC-20). Dynamic 'payTo' Routing: Content: Supports request-level fund routing. Funds can be dynamically distributed to different recipient addresses or roles based on the parameters of the request, or execute complex on-chain revenue-sharing logic. Change: Very suitable for decentralized markets and multi-tenant platforms, facilitating automatic profit sharing. Modular architecture and extensions (Extensions & Lifecycle Hooks): Content: Allows developers to add new features (such as automatic price discovery, complex validation logic) in the form of "plugins" without forking the core protocol. CAIP-based multi-chain support: Content: Adopts the CAIP (Chain Agnostic Improvement Proposals) standard to identify assets and networks, natively supporting non-EVM chains (such as Solana). Impact of this upgrade: 1. Unlocking the AI Agent Economy The biggest breakthrough of v2 is the "session mode". For AI, the v1 version required "connecting the wallet, signing, waiting for confirmation" for each operation. v2 allows AI to obtain a "pass" like humans subscribing to services, enabling millisecond-level high-frequency interactions. This is the key infrastructure for the large-scale commercialization of AI agents. 2. Lowering the integration threshold for web3 payments Encapsulating complex on-chain operations in a unified HTTP 402 response allows Web2 developers (such as API providers, SaaS companies) to access crypto payments without needing to deeply understand the underlying blockchain technology. 3. A qualitative change in compatibility and interoperability By supporting Solana and traditional fiat channels, x402 is no longer limited to the EVM ecosystem and has the potential to become a universal internet payment standard.

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