{"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":"Coinbase Exchange API","fetched_at":"2026-09-17T15:17:42.270Z","data_mode":"live_source","top_level_fields":["success","source","data"],"response_shape":{"type":"object","fields":{"success":{"type":"boolean"},"source":{"type":"string"},"data":{"type":"object","fields":{"ticker":{"type":"string"},"product_id":{"type":"string"},"interval":{"type":"string"},"candles":{"type":"array","live_item_count":5,"items":{"type":"object","fields":{"timestamp":{"type":"string"},"price":{"type":"string"},"low":{"type":"string"},"high":{"type":"string"},"open":{"type":"string"},"close":{"type":"string"},"volume":{"type":"number"}},"fields_truncated":false}}},"fields_truncated":false}},"fields_truncated":false}},"request":{"method":"GET","path":"/api/v1/candles","parameters":{"ticker":"bitcoin"}},"purchase":{"price_usdc":"0.05","method":"GET","url":"https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/candles","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":"Coinbase Exchange candles API with CoinGecko fallback"}}