{"success":true,"preview":true,"preview_truncated":true,"preview_mode":"live_contract_proof","preview_note":"The live source completed successfully. This preview shows the request and paid response shape, but withholds decision-ready values. Purchase once to receive the complete current result.","live_proof":{"source":"Open-Meteo Air Quality API","fetched_at":"2026-09-17T15:16:46.666Z","data_mode":"live_source","top_level_fields":["success","source","fetched_at","location","current","units"],"response_shape":{"type":"object","fields":{"success":{"type":"boolean"},"source":{"type":"string"},"fetched_at":{"type":"string"},"location":{"type":"object","fields":{"name":{"type":"string"},"admin1":{"type":"string"},"country":{"type":"string"},"latitude":{"type":"number"},"longitude":{"type":"number"}},"fields_truncated":false},"current":{"type":"object","fields":{"time":{"type":"string"},"interval":{"type":"number"},"us_aqi":{"type":"number"},"european_aqi":{"type":"number"},"pm2_5":{"type":"number"},"pm10":{"type":"number"},"carbon_monoxide":{"type":"number"},"nitrogen_dioxide":{"type":"number"},"ozone":{"type":"number"}},"fields_truncated":false},"units":{"type":"object","fields":{"time":{"type":"string"},"interval":{"type":"string"},"us_aqi":{"type":"string"},"european_aqi":{"type":"string"},"pm2_5":{"type":"string"},"pm10":{"type":"string"},"carbon_monoxide":{"type":"string"},"nitrogen_dioxide":{"type":"string"},"ozone":{"type":"string"}},"fields_truncated":false}},"fields_truncated":false}},"request":{"method":"GET","path":"/api/v1/air_quality","parameters":{"city":"Beijing"}},"purchase":{"price_usdc":"0.02","method":"GET","url":"https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/air_quality","protocol":"x402 v2 exact, USDC on Base mainnet","how":"Repeat this request without preview=true, read the PAYMENT-REQUIRED header, sign it, and retry with PAYMENT-SIGNATURE."},"marketplace_metadata":{"data_mode":"live_source","billable":true,"availability":"operational","source":"Open-Meteo Air Quality API"}}