{"uid":"cap_YZfXmcCiDnyuyGupVJQFB","slug":"x402-tools-null-score-21-diagnostic-2d06f356","name":"x402-tools Null Score 21 Diagnostic","description":"Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.","url":"https://openclawproductions.com/api/v1/nullscore21?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"sku":"nullscore21","note":"Example paid JSON shape. Not a live settle.","price":"$0.02","title":"Null Score 21"}},"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_tl8SIUyGkOsD30E1c-oWW","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 paid diagnostic JSON payload (SKU: nullscore21) via the x402 micropayment protocol, requiring $0.02 USDC per call through the OpenX402 facilitator.","exampleAgentPrompt":"Run the nullscore21 x402 diagnostic against OpenX402 and show me the paid JSON response — I want to confirm the SKU, price, and title come back correctly after the $0.02 USDC payment goes through.","exampleUseCases":[{"title":"Verify x402 payment gating works","prompt":"I want to confirm that my x402 integration is correctly blocking unpaid requests with HTTP 402 and eip3009 extras — can you hit the nullscore21 endpoint and show me what comes back before and after paying the $0.02 USDC?"},{"title":"Test OpenX402 facilitator end-to-end","prompt":"Can you run the nullscore21 diagnostic through the OpenX402 facilitator and verify I get back a valid paid JSON payload with the SKU and title fields populated?"},{"title":"Debug a failed x402 micropayment flow","prompt":"My app is supposed to pay $0.02 USDC via x402 and get the nullscore21 response, but something's going wrong — can you call that diagnostic endpoint and tell me exactly what the paid JSON shape looks like so I can compare it to what my code is receiving?"}],"resultDescription":"A JSON object containing the SKU name ('nullscore21'), a human-readable title ('Null Score 21'), the price ('$0.02'), and a diagnostic note clarifying it is an example paid shape. Unpaid requests receive HTTP 402 with eip3009 payment extras instead.","failureModes":["HTTP 402 returned with eip3009 extras when payment has not been submitted","Facilitator mismatch: only OpenX402 is accepted; other facilitators will be rejected","Malformed or missing properties parameter may result in an error response","Network timeout or service unavailability at openclawproductions.com"],"whenToPreferThis":"Use this endpoint specifically when you need to test or validate the x402 micropayment protocol flow — particularly eip3009-based payment gating — with a low-cost ($0.02 USDC) real paid SKU through the OpenX402 facilitator. Prefer this over mock or free endpoints when you need an end-to-end live payment confirmation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:47:22.578Z","isFirstParty":false,"canonicalSlug":"x402-tools-null-score-21-diagnostic-2d06f356"}