{"id":"6ec9f420-99ca-48d7-b377-e0263b26f0aa","shortId":"HLaamu","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/154/receipt` returns a receipt for transaction 154 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. The platform advertises no API keys, no rate limits, and instant access.\n\nHowever, documentation is extremely thin — 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 specific transaction receipt endpoint probed here has a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02. The payTo address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the asset contract is the canonical Base USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","No example responses available; actual output format is unknown","The endpoint path references a specific transaction ID (154); it is unclear whether other transaction IDs are supported or how they are discovered","Platform advertises many endpoints but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/154/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/154/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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 specific purpose of the transaction receipt endpoint is only inferable from the URL path. Effectively a stub 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'/request':17,34 '0.02':16,33,139,217 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':222 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':232 '154':57 '20000':208 '6':213 'Base network API' 'USDC micropayment API' 'accept':79 'access':158 'address':220 'advertis':91,149 'ai':108 'analysi':112 'analyt':102 'api':99,151,166 'asset':225 'base':9,26,69,146,209,230 'broader':88 'call':4,21,64 'canon':229 'challeng':73 'classif':115 'confirm':74 'connect':175 'content':181 'contract':226 'convers':132 'data':101,105 'decim':214 'detail':192 'doc':165 'document':160,193 'embed':116 'enabl':38 'endpoint':7,24,39,76,135,196,201 'equal':216 'estim':126 'exact':84 'exampl':189 'exchang':121 'export':106 'extrem':162 'feed':120 'financ':117 'format':60 'gas':125 'generat':133 'geocod':130 'howev':159 'infrastructur':128 'insight':107 'instant':157 'json':59 'json-response' 'key':152 'learn':110 'limit':155 'list':137 'live':78 'lowpaymentfee' 'lowpaymentfee.com':41,89 'machin':109 'maxamountrequir':206 'metric':103 'network':70 'no-api-key' 'openapi':185 'page':170 'pay':2,19,96 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':95 'payabl':61 'payment':85 'payto':219 'per':3,20,63,97,140 'per-cal':62 'platform':90,148 'post':80 'price':119,167 'probe':202 'prompt':177 'provid':42 'quot':124 'rate':122,154 'readm':169 'receipt':6,23,45,54,200 'render':172 'report':104 'request':81,98,141 'request/response':188 'resourc':50 'retriev':46 'return':52 'schema':186 'scheme':86 'sentiment':111 'servic':47 'settl':12,29,142 'span':100 'specif':49,198 'substant':180 'suit':93 'summar':114 'text':113 'thin':163 'token':123 'transact':5,22,44,56,199 'transaction receipt API' 'transaction-receipt' 'unit':210 'usdc':14,31,66,144,212,231 'usdc-base' 'util':129 'valid':131 'via':10,27 'wallet':176 'web3':118 'x402':11,28,37,72 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"31e14fb9-ea73-4101-8d5e-3aec458206b0","listingId":"6ec9f420-99ca-48d7-b377-e0263b26f0aa","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/154/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":"2026-04-18T18:58:44.299Z"}],"sources":[{"listingId":"6ec9f420-99ca-48d7-b377-e0263b26f0aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/154/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:44.299Z","lastSeenAt":"2026-04-24T22:32:56.393Z"}],"details":{"listingId":"6ec9f420-99ca-48d7-b377-e0263b26f0aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/154/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":"Endpoint returns 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/transactions/154/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/154/receipt"},{"claim":"Asset contract is Base USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/154/receipt"},{"claim":"Platform lists $0.02/request pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipts programmatically with per-call USDC payment","Agent-driven access to financial data without pre-registration or API keys","Integrating pay-as-you-go receipt lookups into automated workflows"],"bestFor":["Agents needing keyless, pay-per-call access to transaction data","Developers experimenting with x402 payment protocol on Base","Use cases requiring no subscription or rate-limit constraints"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Bulk retrieval of many transaction receipts (no batch endpoint documented)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.235Z"},"updatedAt":"2026-04-24T22:32:56.393Z"}}