{"id":"4254a231-b506-4579-8ee7-a11869b6fdfb","shortId":"vGqyTd","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a transaction receipt retrieval service. The specific endpoint `/api/v1/transactions/99/receipt` accepts POST requests and returns JSON responses, gated behind an x402 payment challenge. Payment is settled in USDC on the Base network at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at a uniform $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the transaction receipt endpoint actually returns or what input it expects beyond a POST method. The endpoint is confirmed live (returns a valid x402 402 challenge), but the lack of documentation makes it difficult to assess the actual utility or data quality of the service.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment API","USDC micropayment endpoint","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The endpoint path includes a hardcoded ID '99' — unclear if this is parameterized or a single fixed resource","No examples of successful responses are available anywhere in the crawled material","The breadth of advertised APIs (AI, finance, analytics, infrastructure) with zero documentation raises concerns about actual service maturity"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/99/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/99/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the purpose of the specific '/transactions/99/receipt' endpoint is unclear. This is effectively a stub 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'/request':17,34 '0.02':16,33,78,142 '000':82 '20':81 '402':217 '6':86 'Base network API' 'USDC micropayment endpoint' 'accept':52 'actual':197,230 'advertis':92 'ai':109 'analysi':113 'analyt':103 'api':100,147,163 'assess':228 'base':9,26,72,83 'base-network' 'behind':60 'beyond':204 'broader':89 'call':4,21,99 'challeng':64,218 'classif':116 'commit':155 'confirm':211 'connect':172 'convers':133 'cost':76 'data':102,106,233 'decim':87 'descript':190 'detail':179 'difficult':226 'doc':162 'document':157,223 'embed':117 'enabl':38 'endpoint':7,24,39,50,136,196,209 'estim':127 'exampl':187 'exchang':122 'expect':203 'export':107 'extrem':159 'feed':121 'financ':118 'gas':126 'gate':59 'generat':134 'geocod':131 'infrastructur':129 'input':201 'insight':108 'json':57 'json-response' 'key':148 'lack':221 'learn':111 'limit':151 'list':138 'live':212 'lowpaymentfee' 'lowpaymentfee.com':41,90 'machin':110 'make':224 'method':207 'metric':104 'minimum':154 'network':73 'no-api-key' 'openapi':183 'page':167 'pay':2,19,97 'pay-per-cal':1,18,96 'pay-per-call' 'pay-per-request API' 'payment':63,65 'per':3,20,79,98,143 'platform':91 'post':53,206 'price':120,164 'prompt':174 'provid':42 'qualiti':234 'quot':125 'rate':123,150 'readm':166 'receipt':6,23,45,195 'render':169 'report':105 'request':54,80,144 'request/response':186 'requir':156 'respons':58 'retriev':46 'return':56,198,213 'schema':184 'sentiment':112 'servic':47,237 'settl':12,29,67 'span':101 'spars':160 'specif':49 'suit':94 'summar':115 'technic':178 'text':114 'token':124 'transact':5,22,44,194 'transaction receipt API' 'transaction-receipt' 'uniform':141 'unit':84 'usdc':14,31,69 'usdc-settlement' 'util':130,231 'valid':132,215 'via':10,27 'wallet':173 'web3':119 'x402':11,28,37,62,216 'x402 payment API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"fc2d863a-4d19-4d1b-a506-c2ce59497ed5","listingId":"4254a231-b506-4579-8ee7-a11869b6fdfb","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/99/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":"2026-04-18T19:27:26.413Z"}],"sources":[{"listingId":"4254a231-b506-4579-8ee7-a11869b6fdfb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/99/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:26.413Z","lastSeenAt":"2026-04-23T22:02:54.818Z"}],"details":{"listingId":"4254a231-b506-4579-8ee7-a11869b6fdfb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/99/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/99/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/99/receipt"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipts via a pay-per-call model","Programmatic access to receipt data without API key management","Agent-driven payment flows using x402 on Base"],"bestFor":["Developers experimenting with x402 payment protocols","Agents that need keyless, pay-as-you-go API access","Use cases requiring USDC-settled micropayments on Base"],"notFor":["Production workloads requiring well-documented APIs with schemas and examples","Users who need free or subscription-based access without per-call crypto payments","Anyone needing detailed transaction receipt specifications before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.108Z"},"updatedAt":"2026-04-23T22:02:54.818Z"}}