{"id":"18736039-bc75-4020-a2e8-a67e7f13e39e","shortId":"YnNHcJ","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/54/receipt`. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint probed returns a 402 challenge requesting payment in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The `maxAmountRequired` is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. Payment is made via the `exact` scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises a uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, no minimums, 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 documentation, and no examples of what the receipt payload actually contains. The purpose of a \"transaction receipt\" for transaction ID 54 is unclear — it may be a demo or placeholder resource rather than a general-purpose API.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-call-pricing","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no technical content","The endpoint path references a hardcoded transaction ID (54), suggesting this may be a demo or placeholder resource","No request body schema or response schema is documented anywhere","Purpose and contents of the 'receipt' response are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/54/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/54/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific resource (transaction 54 receipt) appears to be a fixed/demo path rather than a parameterized general-purpose API. All doc pages return only 'Connect wallet' with no 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'/api/v1/transactions/54/receipt':37 '/docs':156 '/pricing':157 '/readme':159 '/request':135 '0.02':106,134 '000':96 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':89 '20':95 '300':118 '402':82 '54':201 '6':101 'Base network API' 'USDC micropayment API' 'accept':123 'access':152 'across':137 'actual':190 'advertis':131 'ai/ml':58 'analyt':57 'api':53,143,218 'application/json':128 'base':5,18,74,91,97 'broader':43 'call':9,22,52 'challeng':83 'connect':165 'contain':191 'contract':88 'data':56,61 'decim':102 'demo':208 'detail':172 'document':154,181 'dozen':47 'endpoint':3,16,28,54,78,122,140 'equal':105 'exact':114 'exampl':184 'finance/web3':60 'gate':66 'general':216 'general-purpos':215 'howev':153 'id':200 'infer':59 'infrastructur':63 'instant':151 'json-response' 'key':144 'limit':147 'lowpaymentfee' 'lowpaymentfee.com':30 'made':111 'maxamountrequir':93 'may':205 'minim':164 'minimum':149 'network':75 'offer':46 'openapi':176 'page':155 'paid':6,19 'part':40 'pay':50 'pay-per-cal':49 'pay-per-call API' 'payload':189 'payment':70,85,109 'per':8,21,51,107 'per-cal':7,20 'per-call-pricing' 'placehold':210 'platform':44,130 'post':124 'price':136 'probe':79 'prompt':167 'protocol':71 'provid':31 'purpos':193,217 'rate':146 'rather':212 'receipt':2,15,34,188,197 'request':84,108,125 'request/response':179 'resolv':161 'resourc':35,211 'return':80,127 'schema':180 'scheme':115 'second':119 'span':55 'spec':177 'specif':77 'technic':171 'timeout':120 'transact':1,14,33,196,199 'transaction receipt API' 'transaction-receipt' 'unclear':203 'uniform':133 'unit':98 'usdc':13,26,87,104 'usdc-on-base' 'util':64 'via':10,23,67,112 'wallet':166 'x402':11,24,69 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"8587bc83-999b-46a2-9ea5-0d80515dd046","listingId":"18736039-bc75-4020-a2e8-a67e7f13e39e","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/54/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":"2026-04-18T19:27:02.170Z"}],"sources":[{"listingId":"18736039-bc75-4020-a2e8-a67e7f13e39e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/54/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:02.170Z","lastSeenAt":"2026-04-24T14:03:27.095Z"}],"details":{"listingId":"18736039-bc75-4020-a2e8-a67e7f13e39e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/54/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02/request pricing, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/54/receipt"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/54/receipt"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt via a paid x402 call","Demonstrating x402 payment flow on Base with USDC","Integrating micropayment-gated API access into agent workflows"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need to make small USDC-denominated API payments on Base","Testing pay-per-call infrastructure without API key setup"],"notFor":["Production use cases requiring documented request/response schemas","Users who need free or subscription-based API access","Anyone needing detailed transaction data with guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.217Z"},"updatedAt":"2026-04-24T14:03:27.095Z"}}