{"uid":"cap_1ovax-bPXrZ6N6h3oH_4l","slug":"assay-nominal-labs-x402-service-quality-score-dd8e5a9b","name":"Assay Nominal Labs - x402 Service Quality Score","description":"Quality score for any x402 service, earned by real paid probes with on-chain receipts: composite 0-100, component breakdown (payment settlement, schema conformance, ground-truth accuracy, LLM-judged quality), 7-day trend, probe count. Scores publish only after 20+ probes across days; daily corpus digests are Bitcoin-anchored via OpenTimestamps. Query: /score?service={url-encoded resource URL}. Free: /tier/{url}, /leaderboard. Agent guide: https://assay.nominal-labs.com/SKILL.md","url":"https://assay.nominal-labs.com/score","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","required":["service"],"properties":{"service":{"type":"string","description":"URL-encoded resource URL of the x402 service to look up, exactly as advertised in the Bazaar"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_x0UbrkNowA5epHTTQSsnr","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a composite 0-100 quality score for any x402 service, with component breakdowns, 7-day trend, and probe count, earned from real paid probes with Bitcoin-anchored receipts.","exampleAgentPrompt":"Can you pull the Assay quality score for the x402 service at https://api.example.com/forecast — I want to see the composite score, the component breakdown, and how it's trended over the last 7 days?","exampleUseCases":null,"resultDescription":"A JSON object containing a composite 0-100 quality score for the queried x402 service URL, with component sub-scores covering payment settlement, schema conformance, ground-truth accuracy, and LLM-judged quality, plus a 7-day trend and total probe count. Scores are only published after 20+ probes across multiple days, and the underlying corpus digests are Bitcoin-anchored via OpenTimestamps.","failureModes":["Service URL not found or not yet indexed — returns 404 or empty result","Fewer than 20 probes recorded — score not yet published, returns pending or no-score state","Malformed or non-URL-encoded service parameter — returns 400 bad request","Service is not an x402 resource — may return no data or an error","Transient upstream errors — 5xx response"],"whenToPreferThis":"Use this endpoint when an agent needs to independently verify the trustworthiness, reliability, or schema conformance of an x402-gated service before paying for it or recommending it, especially when the underlying corpus is blockchain-anchored for tamper-evidence. Prefer over manual inspection or self-reported quality metrics when objective, probe-backed scoring with on-chain receipts is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:35:44.325Z","isFirstParty":false}