{"id":"4a7f3e78-341f-4b95-b325-efda9ffe3b35","shortId":"QwvUsv","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/279/receipt`. It is part of a broader platform that offers multiple x402-gated API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint probed returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the x402 \"exact\" scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The actual data returned by this receipt endpoint — and indeed by most endpoints on the platform — is undocumented, so callers must discover behavior empirically.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call API","crypto payment gateway"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only a 'Connect wallet' stub.","The actual response payload for this receipt endpoint is completely undocumented.","The platform lists many endpoint categories but none have published technical documentation.","It is unclear what transaction ID 279 refers to or whether the receipt endpoint is parameterized."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/279/receipt","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/279/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages are empty stubs. The purpose of this specific receipt endpoint is unclear beyond its URL 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'/api/v1/transactions/279/receipt':37 '/docs':143 '/pricing':144 '/readme':146 '0.02':67,103 '000':92 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':114 '0x8335':97 '20':91 '2913':98 '300':117 '402':84 '6':101 'Base network API' 'USDC micropayment API' 'accept':122 'access':139 'actual':174 'address':113 'advertis':130 'ai':56 'analyt':55 'api':51,132 'application/json':127 'avail':172 'base':5,18,76,93,100 'base-network' 'behavior':195 'broader':43 'call':9,22 'caller':192 'categori':52 'challeng':85 'connect':152 'crypto payment gateway' 'data':54,175 'decim':102 'detail':159 'discov':194 'document':141 'empir':196 'endpoint':3,16,28,80,121,180,185 'exact':107 'exampl':170 'financ':59 'gate':50 'howev':140 'includ':53 'inde':182 'infrastructur':62 'instant':138 'json-response' 'key':133 'learn':58 'limit':136 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':57 'minim':151 'multipl':47 'must':193 'network':77 'offer':46 'openapi':163 'page':142 'paid':6,19 'part':40 'pay-per-call API' 'payload':171 'payment':87,109 'per':8,21,68 'per-cal':7,20 'per-call-pricing' 'platform':44,129,188 'post':123 'price':65 'probe':81 'prompt':154 'provid':31 'rate':135 'receipt':2,15,34,179 'request':69,86,124 'request/response':166 'resolv':148 'resourc':35 'return':82,126,176 'schema':167 'scheme':108 'second':118 'sent':111 'settl':71 'spec':164 'specif':79 'technic':158 'timeout':119 'transact':1,14,33 'transaction receipt API' 'transaction-receipt' 'undocu':190 'unit':94 'usdc':13,26,73,96 'usdc-settlement' 'util':63 'via':10,23,104 'wallet':153 'web3':60 'x402':11,24,49,106 'x402 paid endpoint' 'x402-gated':48 'x402-payment'","prices":[{"id":"a9878436-1e27-4f94-b8ea-38a06d37e15a","listingId":"4a7f3e78-341f-4b95-b325-efda9ffe3b35","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/279/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:56.459Z"}],"sources":[{"listingId":"4a7f3e78-341f-4b95-b325-efda9ffe3b35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/279/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:56.459Z","lastSeenAt":"2026-04-24T12:04:09.886Z"}],"details":{"listingId":"4a7f3e78-341f-4b95-b325-efda9ffe3b35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/279/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid payment to receive the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transactions/279/receipt"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) resolve to a minimal 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt via a single paid API call","Demonstrating x402 payment flow integration on Base","Agent-driven micropayment workflows for on-chain data"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need pay-per-call access without API keys","Low-cost per-request data retrieval on Base"],"notFor":["Production workloads requiring documented request/response schemas","Use cases needing bulk or subscription-based pricing","Users who cannot pay in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.858Z"},"updatedAt":"2026-04-24T12:04:09.886Z"}}