{"uid":"cap_djOVZSoJlvlKssxzeChIk","slug":"x402-seller-conformance-roster-abb48e4a","name":"x402 Seller Conformance Roster","description":"Parameter-free: the Blockchain IQ x402 Conformance Index in one call. The top 1,000 x402 sellers ranked by an A to F grade from our own daily unpaid probe of their listed endpoints: valid HTTP 402, x402 v2, payment terms, schema, 7-day uptime, price range, 30-day payers and calls, with method and sources. Dated each day; never sold when the probe is over 48 hours old. Use to screen endpoints for protocol conformance before an agent pays. JSON, no API key. $0.02 per call. Blockchain IQ.","url":"https://www.blockchainiq.co/api/x402/v1/x402-market?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":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_2_CzYs2kN2fG2roBZyQFK","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":"Returns a daily-ranked list of the top 1,000 x402 protocol sellers graded A–F by automated conformance probes covering uptime, schema validity, payment terms, and usage metrics.","exampleAgentPrompt":"Before my agent pays any x402 endpoint, pull the Blockchain IQ x402 conformance roster and show me the top sellers graded A or B so I only route payments to protocol-compliant endpoints.","exampleUseCases":[{"title":"Pre-payment endpoint vetting","prompt":"I'm about to have my agent pay several x402 sellers — can you pull today's x402 conformance roster and filter it to only show sellers with an A or B grade so I know which ones are safe to pay?"},{"title":"Uptime screening before integration","prompt":"I need to integrate a few x402 endpoints into my workflow — fetch the x402 seller conformance list and tell me which ones have had solid 7-day uptime and are passing the protocol probe."},{"title":"Comparing x402 seller activity","prompt":"Which x402 sellers have the most payers and calls over the last 30 days? Pull the conformance roster and sort by usage so I can see which endpoints are actually getting traction."}],"resultDescription":"A JSON array of up to 1,000 x402 seller records, each containing: seller endpoint URL, conformance grade (A–F), HTTP 402 validity, x402 v2 compliance flag, payment terms and schema status, 7-day uptime percentage, price range, 30-day payer count, 30-day call count, probe method, data sources, and the probe date. The dataset is only served when the underlying probe is less than 48 hours old.","failureModes":["Probe data over 48 hours old — endpoint returns an error or empty payload rather than stale data","Network or server error returning a non-200 status","Empty or truncated seller list if the daily probe has not yet completed","Payment failure (x402 $0.02 USDC not settled) resulting in a 402 response with payment instructions"],"whenToPreferThis":"Use this endpoint when an AI agent needs to screen or rank x402 protocol sellers before committing payments, when you want an independent daily conformance audit rather than self-reported seller metadata, or when you need a single parameterless call to get a full ranked leaderboard of live x402 endpoints with uptime and schema validity already scored.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:08:16.341Z","isFirstParty":false,"canonicalSlug":"x402-seller-conformance-roster-abb48e4a"}