TIER_B · protocol release

x402 seller docs list Solana alongside Base

Official seller documentation lists Base mainnet, Base Sepolia, Solana mainnet and Solana devnet as CAIP-2 identifiers. Foundry’s production policy remains Base USDC receive-only. Editorial coverage must not collapse the protocol to one chain.

Event 15 January 2026 · source 15 January 2026 · zFinia published 7 September 2026 · retrospective

Why it matters

Chain diversity is a routing and accounting problem for machine buyers.