{"id":"40510ad4-c2b3-4f89-9bb8-464b06322e78","shortId":"zkVU8E","kind":"x402","title":"Transaction receipt retrieval via x402 micropayment on Base network for $0.02 per request.","tagline":"Transaction receipt retrieval via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource path `/api/v1/transactions/389/receipt`) behind an x402 paywall. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns JSON.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments — payment is handled entirely through the x402 protocol using USDC on Base.\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 spec, no request/response schema documentation, and no usage examples available from the crawled content. The specific endpoint probed here (`/transactions/389/receipt`) appears to be a single-resource receipt lookup, but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","transaction-receipt","pay-per-call","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["transaction receipt API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto receipt endpoint","402 payment API"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content.","No OpenAPI spec or request/response schema available — request body format and response structure are unknown.","The endpoint path references a specific transaction ID (389), which may be a fixed demo resource rather than a parameterized endpoint.","The platform lists many API categories (AI, analytics, finance, utilities) all at $0.02, but no evidence of actual functionality behind any of them was found in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/389/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/389/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 402 challenge, confirming it is operational. However, documentation is effectively nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of this particular receipt endpoint (transaction 389) is unclear and may be a demo resource rather than a general-purpose 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'/transactions/389/receipt':184 '0.02':11,24,54,112 '000':58 '20':57 '402 payment API' '6':62 'Base network API' 'USDC pay-per-call' 'accept':66 'access':32 'advertis':76 'ai/ml':88 'analysi':91 'analyt':87 'api':84,117,144 'appear':185 'avail':174 'base':8,21,51,59,137 'behind':40 'bodi':198 'broader':73 'call':83 'classif':93 'commit':125 'connect':153 'content':178 'convers':105 'crawl':177 'crypto':97 'crypto receipt endpoint' 'data':86,99 'decim':63 'detail':160 'doc':143 'document':138,169 'embed':94 'endpoint':28,65,108,181 'entir':129 'exact':196 'exampl':173 'extrem':140 'financ':95 'format':199 'generat':106 'geocod':103 'handl':128 'infer':89 'infrastructur':101 'json':71 'json-response' 'key':118 'limit':121 'list':110 'lookup':193 'lowpaymentfee' 'lowpaymentfee.com':30,74 'market':98 'micropay':6,19 'minimum':124 'network':9,22,52 'no-api-key' 'openapi':164 'page':148 'path':38 'pay':81 'pay-per-cal':80 'pay-per-call' 'payment':44,126 'paywal':43 'per':12,25,55,82,113 'platform':75 'post':67 'price':145 'probe':182 'prompt':155 'protocol':133 'provid':31 'rate':120 'readm':147 'receipt':2,15,36,192 'render':150 'request':13,26,56,68,114,197 'request/response':167 'resourc':37,191 'respons':201 'retriev':3,16 'return':70 'schema':168 'sentiment':90 'settl':46 'singl':190 'single-resourc':189 'span':85 'spars':141 'spec':165 'specif':180 'structur':202 'suit':78 'summar':92 'technic':159 'transact':1,14,35 'transaction receipt API' 'transaction-receipt' 'unit':60 'unknown':204 'usag':172 'usdc':48,135 'usdc-base' 'use':134 'util':102 'valid':104 'via':4,17 'wallet':154 'x402':5,18,42,132 'x402 micropayment API' 'x402-payment'","prices":[{"id":"57e84842-f556-43eb-8c8b-7b1c2fa5902a","listingId":"40510ad4-c2b3-4f89-9bb8-464b06322e78","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/389/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":"2026-04-18T19:26:40.490Z"}],"sources":[{"listingId":"40510ad4-c2b3-4f89-9bb8-464b06322e78","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/389/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:40.490Z","lastSeenAt":"2026-04-24T13:03:19.377Z"}],"details":{"listingId":"40510ad4-c2b3-4f89-9bb8-464b06322e78","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/389/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/389/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/389/receipt"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt by ID via programmatic micropayment","Integrating pay-per-call receipt lookups into agent workflows","Accessing financial transaction data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-per-use transaction data","Workflows requiring on-demand receipt retrieval without rate limits"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume batch retrieval where per-request pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.241Z"},"updatedAt":"2026-04-24T13:03:19.377Z"}}