{"openapi":"3.1.0","info":{"title":"Cent","version":"1.0.0","description":"Live Base snapshot for AI agents. Each GET returns the current Base block number, base fee, gas price, ETH-USD price, and a unique receipt. Price is exactly $0.01 USDC on Base via x402. No API key and no RPC method. GET /ping returns the same snapshot. Use it as a chain read or as the cheap call that proves an x402 client can pay."},"servers":[{"url":"https://d1ithbpxjsnhrn.cloudfront.net"}],"paths":{"/":{"get":{"operationId":"baseSnapshot","summary":"Pay $0.01 USDC for a live Base block, gas, and ETH-USD snapshot","responses":{"200":{"description":"Live Base snapshot and the receipt for this call. JSON unless the client accepts text/html.","content":{"application/json":{"schema":{"type":"object","properties":{"visit":{"type":"object"},"snapshot":{"type":"object"},"page":{"type":"object"}},"required":["visit","snapshot","page"]},"example":{"visit":{"id":"8f1c0a2e-7b34-4c1a-9d2e-6a0b1c2d3e4f","number":1,"paidUsd":"0.01","paidAtomic":"10000","asset":"USDC","network":"eip155:8453","payer":"0x0000000000000000000000000000000000000000","at":"2026-10-11T00:00:00.000Z"},"snapshot":{"network":"eip155:8453","chain":"Base","blockNumber":"12345678","blockTimestamp":"2026-10-11T00:00:00.000Z","baseFeeGwei":"0.0080","gasPriceGwei":"0.0100","ethUsd":"3500.00","sources":["https://mainnet.base.org","https://api.coinbase.com/v2/prices/ETH-USD/spot"],"at":"2026-10-11T00:00:00.000Z"},"page":{"title":"Cent","priceUsd":"0.01","text":"These are the live Base numbers for the request that just paid. They were read after the payment settled.\n\nBlock, gas, and the ETH-USD price move. A saved copy goes stale. The next GET is a new read and another $0.01.\n\nFree files such as /llms.txt explain how to pay. The live numbers are only in this paid response."}}}}},"402":{"description":"Payment required. Sign the base64 JSON in the PAYMENT-REQUIRED header and retry with PAYMENT-SIGNATURE.","headers":{"PAYMENT-REQUIRED":{"schema":{"type":"string"},"description":"Base64-encoded x402 v2 PaymentRequired object."}}}}}},"/ping":{"get":{"operationId":"baseSnapshotPing","summary":"Pay $0.01 USDC for a live Base block, gas, and ETH-USD snapshot","responses":{"200":{"description":"Live Base snapshot and the receipt for this call. JSON unless the client accepts text/html.","content":{"application/json":{"schema":{"type":"object","properties":{"visit":{"type":"object"},"snapshot":{"type":"object"},"page":{"type":"object"}},"required":["visit","snapshot","page"]},"example":{"visit":{"id":"8f1c0a2e-7b34-4c1a-9d2e-6a0b1c2d3e4f","number":1,"paidUsd":"0.01","paidAtomic":"10000","asset":"USDC","network":"eip155:8453","payer":"0x0000000000000000000000000000000000000000","at":"2026-10-11T00:00:00.000Z"},"snapshot":{"network":"eip155:8453","chain":"Base","blockNumber":"12345678","blockTimestamp":"2026-10-11T00:00:00.000Z","baseFeeGwei":"0.0080","gasPriceGwei":"0.0100","ethUsd":"3500.00","sources":["https://mainnet.base.org","https://api.coinbase.com/v2/prices/ETH-USD/spot"],"at":"2026-10-11T00:00:00.000Z"},"page":{"title":"Cent","priceUsd":"0.01","text":"These are the live Base numbers for the request that just paid. They were read after the payment settled.\n\nBlock, gas, and the ETH-USD price move. A saved copy goes stale. The next GET is a new read and another $0.01.\n\nFree files such as /llms.txt explain how to pay. The live numbers are only in this paid response."}}}}},"402":{"description":"Payment required. Sign the base64 JSON in the PAYMENT-REQUIRED header and retry with PAYMENT-SIGNATURE.","headers":{"PAYMENT-REQUIRED":{"schema":{"type":"string"},"description":"Base64-encoded x402 v2 PaymentRequired object."}}}}}}}}