{"uid":"cap_VD6jjnxtobxdoG0ZmJyIG","slug":"x402-tools-null-hold-21-diagnostic-endpoint-7836d62e","name":"x402-tools Null Hold 21 Diagnostic Endpoint","description":"Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.","url":"https://openclawproductions.com/api/v1/nullhold21?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"sku":"nullhold21","note":"Example paid JSON shape. Not a live settle.","price":"$0.02","title":"Null Hold 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_FPPrF8EgCZfLdCq2AWy9C","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 for SKU 'nullhold21' to test x402 HTTP payment flow and EIP-3009 authorization","exampleAgentPrompt":"Run the x402 nullhold21 diagnostic against the OpenX402 facilitator so I can confirm my EIP-3009 payment authorization is working and see the paid JSON response shape.","exampleUseCases":[{"title":"Verify x402 payment gating works","prompt":"Can you hit the nullhold21 x402 diagnostic endpoint and confirm that an unpaid request gets a proper HTTP 402 with EIP-3009 extras, and that a paid request returns the expected JSON payload?"},{"title":"End-to-end USDC micropayment test","prompt":"I want to test my USDC wallet's EIP-3009 signing against a live x402 endpoint — run the nullhold21 SKU call through OpenX402 and show me the response I get back after payment clears."},{"title":"Validate OpenX402 facilitator integration","prompt":"Before I go live, check that the OpenX402 facilitator is correctly processing payments for the nullhold21 SKU — make the paid call and confirm the diagnostic JSON comes back with the right SKU, title, and price fields."}],"resultDescription":"A JSON object containing the SKU identifier ('nullhold21'), a human-readable title ('Null Hold 21'), the price ('$0.02'), and a note clarifying the payload shape. On unpaid requests, returns HTTP 402 with EIP-3009 payment extension headers indicating where and how to pay.","failureModes":["HTTP 402 returned when no valid x402 payment header is provided — expected behavior for unpaid requests","Payment rejected if EIP-3009 authorization signature is malformed or expired","OpenX402 facilitator unavailable returns 5xx error","Invalid or missing properties parameter may return 400 bad request","USDC insufficient balance causes payment failure before response is returned"],"whenToPreferThis":"Use this endpoint when you need a minimal, low-cost ($0.02 USDC) live test of the x402 HTTP payment protocol with OpenX402 as the facilitator, especially to validate EIP-3009 authorization flows, inspect the HTTP 402 response shape, or confirm end-to-end micropayment gating before deploying your own x402-gated service.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:47:18.482Z","isFirstParty":false,"canonicalSlug":"x402-tools-null-hold-21-diagnostic-endpoint-7836d62e"}