Shipping x402 on Solana: three failures the docs don't mention I put a paper-trading lab's telemetry up for sale over x402 — 8 endpoints on a Cloudflare Worker, $0.01–$0.02 per request, USDC on Solana mainnet, listed in the CDP Bazaar. The happy path took an afternoon. Getting real settlements to work took three genuinely undocumented failures. This is the writeup I wish had existed. Quick primer if you haven't touched x402 v2: a paid endpoint answers 402 with a PAYMENT-REQUIRED hea...