{"uid":"cap_-_dP8MsMiO3Xh3lkKPMBd","slug":"chain-evidence-check-1474820d","name":"Chain Evidence Check","description":"Chain Evidence Check — Judges whether an on-chain observation really proves a claim about a payment, a wallet or an RPC endpoint on an EVM chain, and answers as JSON with a binary verdict, the reason and the one check that would decide. Knows the readings that answer for the wrong thing - a null transaction receipt seconds after settlement, a block explorer that indexes a minute late and a balance view that lags its own transfer list, a public RPC endpoint that refuses receipts with an error or…","url":"https://api.aiskills402.com/v1/skills/chain-evidence-check/file?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","HEAD"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"ok":true,"file":{"name":"SKILL.md","content":"<the SKILL.md file>","encoding":"utf-8"},"name":"Chain Evidence Check","skill":"chain-evidence-check","sha256":"<sha256 of SKILL.md>","receipt":{"tx":"0x<settlement transaction>","settled":true},"version":"1.0.0","redownload":{"url":"<api>/v1/purchases/<token>","token":"<64 hex chars>"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_yepuf-aic8FFrXuZojXGZ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Judges whether an on-chain observation (transaction receipt, block, balance, RPC response) truly proves a specific claim about a payment, wallet, or EVM RPC endpoint, returning a binary verdict with reasoning.","exampleAgentPrompt":"I just got a null transaction receipt two seconds after my USDC payment settled on Base — can you check whether that actually proves the payment failed, or if it's just a timing issue with the RPC endpoint?","exampleUseCases":[{"title":"Post-settlement receipt timing dispute","prompt":"My agent says the transaction receipt came back null right after I paid, but the funds left my wallet. Can you judge whether that null receipt is real evidence that the payment failed, or just an RPC indexing lag?"},{"title":"Block explorer late-indexing false negative","prompt":"A block explorer is showing my transaction as unconfirmed a full minute after it was included in a block — does that explorer reading actually prove the payment didn't go through, or is the explorer just slow to index?"},{"title":"Wallet balance lag vs transfer list mismatch","prompt":"My wallet balance hasn't updated yet but the transfer list shows the funds moved — can you verify whether the stale balance view is valid proof that the payment is still pending, or if the transfer list is the authoritative source?"}],"resultDescription":"A JSON object with a binary verdict (true/false), a plain-language reason explaining the judgment, and identification of the single decisive check that would confirm or refute the claim. The response also includes the SKILL.md content, a sha256 hash, settlement transaction reference, and a redownload token for future access.","failureModes":["Ambiguous or incomplete observation description may result in an inconclusive verdict","RPC endpoints that refuse receipts with errors may not provide enough data for a definitive judgment","Payment via x402 required — unpaid requests will return a 402 response","Highly novel chain configurations or non-standard EVM forks may fall outside the model's training","Edge cases involving simultaneous chain reorganizations may produce uncertain verdicts"],"whenToPreferThis":"Choose this endpoint when an AI agent or developer needs to reason about whether a specific on-chain data point (receipt, balance, explorer response) is actually sufficient evidence for a claim — especially in x402 payment flows, automated settlement verification, or when debugging false-negative payment proofs on EVM chains. It is purpose-built for the specific failure modes of EVM evidence interpretation (timing lags, RPC errors, indexer delays) rather than generic blockchain analytics.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-01T06:49:58.128Z","isFirstParty":false,"canonicalSlug":"chain-evidence-check-1474820d"}