{"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":"base public JSON-RPC","fetched_at":"2026-09-17T23:34:32.440Z","data_mode":"live_source","top_level_fields":["success","source","fetched_at","network","chain_id","block_number","block_number_hex"],"response_shape":{"type":"object","fields":{"success":{"type":"boolean"},"source":{"type":"string"},"fetched_at":{"type":"string"},"network":{"type":"string"},"chain_id":{"type":"number"},"block_number":{"type":"string"},"block_number_hex":{"type":"string"}},"fields_truncated":false}},"request":{"method":"GET","path":"/api/v1/evm_block_number","parameters":{"chain":"base"}},"purchase":{"price_usdc":"0.001","method":"GET","url":"https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/evm_block_number","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":"public EVM JSON-RPC"}}