{"uid":"cap_v7sMiukOeNn-xhKDFeiZD","slug":"x402-data-api-top-apis-by-uptime-10c1e4f0","name":"x402 Data API – Top APIs by Uptime","description":"x402 APIs ranked by the uptime we measure every 6 hours over 30 days, then by payers and latency, optionally only well-paid ones.","url":"https://tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws/v1/uptime/top?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{"limit":{"type":"integer","description":"how many results (1-50, default 20)"},"min_payers":{"type":"integer","description":"only APIs with at least this many payers (default 5)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"results":{}}}}}}},"responseSchema":{"type":"json","example":{"results":[{"probes":120,"resource":"https://api.example/v1/x","median_ms":140,"payers_30d":61,"uptime_30d":1}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_PIZ1xz-y-QEOSo0DPBXPw","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a ranked list of x402 APIs sorted by 30-day uptime, then by number of payers and latency, with optional filtering by minimum payer count.","exampleAgentPrompt":"Show me the top 20 most reliable x402 APIs from the last 30 days, but only include ones with at least 10 payers so I know they're actually being used.","exampleUseCases":[{"title":"Vetting APIs before integration","prompt":"I'm about to build something on top of x402 APIs — can you pull up the top 15 most reliable ones from the past 30 days, limited to those with at least 5 payers, so I know they're production-quality?"},{"title":"Discovering popular well-maintained APIs","prompt":"What are the top 10 x402 APIs right now ranked by uptime? I want to see ones that real users are actually paying for, so filter to at least 20 payers."},{"title":"Monitoring x402 ecosystem health","prompt":"Give me a full list of the top 50 x402 APIs by uptime over the last 30 days — no minimum payer filter — so I can get a broad view of what's up and running in the ecosystem."}],"resultDescription":"Returns a JSON array of up to 50 x402 API entries, each including: resource URL, number of uptime probes conducted, 30-day uptime ratio (0–1), median response latency in milliseconds, and number of distinct payers in the last 30 days. Results are sorted descending by uptime, then by payer count and latency.","failureModes":["Invalid limit value (outside 1–50 range) may return an error or be clamped","min_payers filter too high may return an empty results array","Service unavailability returns a non-200 HTTP response","Payment failure (insufficient USDC balance) blocks the request entirely"],"whenToPreferThis":"Use this endpoint when you need to discover the most reliable x402 APIs available, especially when you want to filter to only APIs with proven payment activity (real payers). Prefer this over the 'most payers' endpoint when uptime/reliability is the primary criterion rather than popularity, and over the 'recently appeared' endpoint when you want established, stable APIs rather than new listings.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-25T12:31:06.737Z","isFirstParty":false,"canonicalSlug":"x402-data-api-top-apis-by-uptime-10c1e4f0"}