Dev Tools · 1h ago
Migrating x402 Payment API from V1 to V2 on Base Mainnet
A developer shares field notes from migrating a live, payment-gated API from x402 V1 to V2 on Base mainnet. Key changes include moving the challenge from body to header, adopting CAIP-2 network identifiers, and native CDP facilitator auth. The guide includes working production code and a migration checklist.
Meridian48 take
Practical migration guide for x402 V2, but the real pressure comes from agents silently failing against V1 services — a hidden revenue leak.
x402base-mainnet