{"uid":"cap_kRyD-q0e98nUDJzfiJ79v","slug":"nimbus-onchain-data-api-check-endpoint-health-probe-65c0b01e","name":"Nimbus Onchain Data API – /check Endpoint Health Probe","description":"x402 pay-per-call. Payments are per request in USDC and are final. No refunds on-chain. Service is provided as-is and may change or stop without notice. Informational data only, not financial, investment, legal, or tax advice. Metrics such as net transfer volume estimates and wallet clusters are algorithmic estimates from public blockchain data and may be wrong or delayed. Provided as-is with no warranty. Methodology: https://crypto-data-api-zo95.onrender.com/methodology.","url":"https://crypto-data-api-zo95.onrender.com/check?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string"}}},"responseSchema":{"type":"json","example":{"url":"https://example.com/api","asset":"USDC","price":{"human":"0.02","atomic":"20000","decimals":6},"network":"base","reachable":true,"checked_at":"2026-09-29T19:40:00Z","leaked_200":false,"http_status":402,"fail_rate_24h":{"rate":"0.00","probes":1},"schema_missing":null,"envelope_parses":true,"last_probe_block":{"at":"2026-09-29T19:40:00Z","block":"12345"},"schema_advertised":["status"],"schema_returned_last_settled":null}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_xqn1BlQyahz72JNqA8vFC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether a given x402 pay-per-call API URL is reachable, properly configured, and returning valid x402 payment envelopes","exampleAgentPrompt":"Can you check whether this x402 API endpoint is reachable, returning proper 402 responses, and what its 24-hour fail rate looks like? The URL is https://crypto-data-api-zo95.onrender.com/api/wallets.","exampleUseCases":[{"title":"Verify x402 endpoint before integrating","prompt":"Before I build against this pay-per-call API, can you probe https://example-data-api.com/prices and tell me if it's reachable, returning a valid 402, and what asset and network it's configured for?"},{"title":"Debug a leaking 200 on a paid API","prompt":"I suspect this x402 endpoint at https://myblockchainapi.io/transfers is leaking 200 responses without requiring payment — can you check if leaked_200 is true and whether the envelope parses correctly?"},{"title":"Monitor 24h fail rate of a crypto API","prompt":"What's the 24-hour fail rate and last probe block for the x402 endpoint at https://onchain-data.io/nft-prices? I want to know if it's been reliable lately."}],"resultDescription":"Returns a JSON object containing: whether the URL is reachable, the HTTP status code observed, the x402 payment asset (e.g. USDC), price in human-readable and atomic form, the network (e.g. Base), whether a 200 was leaked without payment, the 24-hour fail rate and probe count, whether the payment envelope parses correctly, advertised and returned schemas, and the timestamp and block number of the last probe.","failureModes":["URL not provided or malformed — likely returns a 400 or validation error","Target endpoint is unreachable — reachable field returns false","Target endpoint not configured as x402 — envelope_parses or schema fields may be null/false","Service itself may be unavailable (hosted on Render free tier, which can sleep) — connection timeout","Data may be delayed or stale — last_probe_block timestamp may be old"],"whenToPreferThis":"Use this endpoint when you need to programmatically verify that a specific x402 pay-per-call API URL is properly configured, reachable, and behaving correctly — especially before integrating it into an agent workflow, auditing it for leaking free responses, or monitoring its reliability over time. Prefer this over general HTTP ping tools when you need x402-specific envelope and schema validation details.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-17T18:35:07.972Z","isFirstParty":false,"canonicalSlug":"nimbus-onchain-data-api-check-endpoint-health-probe-65c0b01e"}