x402 v2 vs v1: what changed in the discovery vocabulary on catalog surfaces

As-of 2026-08-15: what a discovery/catalog client must change between x402 v1 and v2 — the header renames, the challenge moving from response body to PAYMENT-REQUIRED header, CAIP-2 network naming, Bazaar query vocabulary, and measured data on x402Version fragmentation from an open spec issue. — Read the full piece on Tenjin:…