{"id":"9821ad5f-d08d-46e3-8686-95e1677f0802","shortId":"msTaL8","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 resource `/api/v1/transactions/355/receipt` returns a receipt for transaction 355 in JSON format, payable per-call with USDC on the Base network. The x402 challenge confirms the endpoint is live, accepting POST requests with an exact payment scheme.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request 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 $0.02 per request, settled in USDC on Base, with no API keys, no rate limits, and no minimum commitments.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual behavior and response format of this specific receipt endpoint—or any of the other advertised endpoints—cannot be verified from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided beyond basic HTTP method info","Response format and actual data returned by this endpoint are unknown","The platform advertises many endpoints but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/355/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/355/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), but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual functionality and response format cannot be 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'/request':17,34 '0.02':16,33,139 '355':57 'Base network API' 'USDC micropayment API' 'accept':79 'actual':197 'advertis':91,212 'ai':108 'analysi':112 'analyt':102 'api':99,149,165 'avail':219 'base':9,26,69,146 'base-network' 'behavior':198 'broader':88 'call':4,21,64 'cannot':214 'challeng':73 'classif':115 'commit':157 'confirm':74 'connect':174 'content':180 'convers':132 'data':101,105 'detail':191 'doc':164 'document':159,192 'embed':116 'enabl':38 'endpoint':7,24,39,76,135,195,206,213 'estim':126 'exact':84 'exampl':188 'exchang':121 'export':106 'extrem':161 'feed':120 'financ':117 'format':60,201 'gas':125 'generat':133 'geocod':130 'howev':158 'infrastructur':128 'insight':107 'json':59 'json-response' 'key':150 'learn':110 'limit':153 'list':137 'live':78 'lowpaymentfee' 'lowpaymentfee.com':41,89 'machin':109 'materi':220 'metric':103 'minimum':156 'network':70 'no-api-key' 'openapi':184 'page':169 'pay':2,19,96 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':95 'payabl':61 'payment':85 'per':3,20,63,97,140 'per-cal':62 'platform':90 'post':80 'price':119,166 'prompt':176 'provid':42 'quot':124 'rate':122,152 'readm':168 'receipt':6,23,45,54,205 'render':171 'report':104 'request':81,98,141 'request/response':187 'resourc':50 'respons':200 'retriev':46 'return':52 'schema':185 'scheme':86 'sentiment':111 'servic':47 'settl':12,29,142 'span':100 'spars':162 'specif':49,204 'substant':179 'suit':93 'summar':114 'text':113 'token':123 'transact':5,22,44,56 'transaction receipt API' 'transaction-receipt' 'usdc':14,31,66,144 'usdc-settlement' 'util':129 'valid':131 'verifi':216 'via':10,27 'wallet':175 'web3':118 'x402':11,28,37,72 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"5dd84b5a-08c6-458c-97c3-9487c40be3ea","listingId":"9821ad5f-d08d-46e3-8686-95e1677f0802","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/355/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":"2026-04-18T19:26:18.631Z"}],"sources":[{"listingId":"9821ad5f-d08d-46e3-8686-95e1677f0802","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/355/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:18.631Z","lastSeenAt":"2026-04-24T07:32:36.657Z"}],"details":{"listingId":"9821ad5f-d08d-46e3-8686-95e1677f0802","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/355/receipt\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with USDC payment proof to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/355/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/355/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 render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipts programmatically with per-call USDC payment","Integrating pay-per-use API access into agent workflows without API key management","Accessing financial or transactional data on a zero-commitment basis"],"bestFor":["Agents or applications needing keyless, pay-per-call API access","Developers experimenting with x402 protocol integrations","Use cases requiring low-friction micropayment-gated endpoints"],"notFor":["Production workloads requiring well-documented, schema-validated APIs","Users who need detailed endpoint documentation or guaranteed SLAs","High-volume use cases where per-request pricing may not be cost-effective"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.259Z"},"updatedAt":"2026-04-24T07:32:36.657Z"}}