{"uid":"cap_4m_1IMWlhwHPNUjR88-PG","slug":"duplicate-charge-detector-f80a7530","name":"Duplicate Charge Detector","description":"Detect duplicate charge fingerprints","url":"https://phion.systems/v1/paid/trust/duplicate-charge-detector","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema"},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_PYMpU6GJ7S5j_63S2yPPS","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Detects duplicate charge fingerprints to prevent double-billing in agent payment flows","exampleAgentPrompt":"Before processing this payment, check if it's a duplicate — scan the charge fingerprint and tell me if we've already processed an identical charge recently.","exampleUseCases":[{"title":"Prevent double-billing in checkout flow","prompt":"Before we finalize this x402 payment, run the charge fingerprint through the duplicate detector to make sure we haven't already paid this exact charge."},{"title":"Guard against repeated tool-call payments","prompt":"My agent loop might have retried — can you check whether the charge fingerprint from this transaction was already processed so we don't pay twice?"},{"title":"Audit incoming payment requests for fraud","prompt":"We're getting multiple payment requests that look similar — run each charge fingerprint through the duplicate detector and flag any that match an existing transaction."}],"resultDescription":"Returns a detection result indicating whether the submitted charge fingerprint matches a previously seen charge, effectively flagging potential duplicate billing attempts before payment is executed.","failureModes":["Empty or malformed input schema may result in validation errors","Ambiguous or missing fingerprint data could yield inconclusive results","Network timeouts at the phion.systems endpoint","Insufficient charge metadata to produce a reliable fingerprint comparison"],"whenToPreferThis":"Use this endpoint in agentic payment pipelines where the same charge could be submitted multiple times due to retries, network failures, or loop errors — especially in x402 payment flows where idempotency is critical and double-billing would be costly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:47:27.801Z","isFirstParty":false}