{"id":"ed2a54e3-c428-4afa-9119-a07c492f85b2","shortId":"cQDQb9","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt resource for transaction #62 via the x402 payment protocol. It accepts POST requests and returns JSON after receiving a USDC micropayment on the Base network. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\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/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request with no API keys, no rate limits, and no commitments required — payment is handled entirely through the x402 protocol using USDC on Base.\n\nThis specific endpoint (/api/v1/transactions/62/receipt) appears to serve a transaction receipt. Documentation beyond the landing page is minimal — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt, providing no additional schema or usage details. The endpoint is confirmed live (returns a proper 402 challenge), but the exact response payload structure is undocumented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment endpoint","402 payment required"],"warnings":["No documentation available beyond landing page — docs/pricing/README pages all show only 'Connect wallet'","No response schema or example response provided","The specific resource (transactions/62/receipt) suggests a fixed transaction ID, which may not be generally useful","Purpose and content of the receipt response is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/62/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/62/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially absent — no response schema, no request body schema, no examples, and the docs pages are empty. The specific purpose of this receipt endpoint is unclear beyond its URL 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'/request':13,28 '0.02':12,27,79,127 '000':70 '20':69 '402':199 '402 payment required' '6':75 '62':44 'Base network API' 'USDC pay-per-call' 'accept':51 'access':39 'addit':186 'advertis':86 'ai/ml':98 'analysi':101 'analyt':97 'api':38,94,132,172 'appear':157 'base':9,24,64,71,152 'base-network' 'beyond':164 'broader':83 'call':4,19,93 'challeng':200 'classif':103 'commit':139 'confirm':194 'connect':181 'convers':119 'crypto payment endpoint' 'data':96 'decim':76 'detail':190 'doc':171 'document':163 'embed':104 'endpoint':7,22,32,122,155,192 'entir':144 'equal':78 'estim':113 'exact':203 'exchang':108 'feed':107 'finance/web3':105 'gas':112 'generat':120 'geocod':117 'handl':143 'infer':99 'infrastructur':115 'json':56 'json-response' 'key':133 'land':166 'limit':136 'live':195 'lowpaymentfee' 'lowpaymentfee.com':34,84 'micropay':61 'minim':169 'network':65 'no-api-key' 'page':167,176 'pay':2,17,91 'pay-per-cal':1,16,90 'pay-per-call' 'payload':205 'payment':48,141 'per':3,18,80,92,128 'platform':85 'post':52 'premium':37 'price':67,106,124,173 'prompt':183 'proper':198 'protocol':49,148 'provid':35,184 'quot':111 'rate':109,135 'readm':175 'receipt':6,21,40,162 'receiv':58 'render':178 'request':53,81,129 'requir':140 'resourc':41 'respons':204 'return':55,196 'schema':187 'sentiment':100 'serv':159 'span':95 'specif':154 'structur':206 'suit':88 'summar':102 'token':110 'transact':5,20,43,161 'transaction receipt API' 'transaction-receipt' 'undocu':208 'uniform':125 'unit':72 'usag':189 'usdc':15,30,60,74,150 'usdc-micropayment' 'use':149 'util':116 'valid':118 'via':10,25,45 'wallet':182 'x402':11,26,47,147 'x402 micropayment' 'x402-payment'","prices":[{"id":"89398aa4-0b85-4d0d-a17d-53efa6975ff3","listingId":"ed2a54e3-c428-4afa-9119-a07c492f85b2","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/62/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":"2026-04-18T19:26:54.453Z"}],"sources":[{"listingId":"ed2a54e3-c428-4afa-9119-a07c492f85b2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/62/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:54.453Z","lastSeenAt":"2026-04-24T04:04:20.498Z"}],"details":{"listingId":"ed2a54e3-c428-4afa-9119-a07c492f85b2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/62/receipt \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\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 requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/62/receipt"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/62/receipt"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt after completing a payment flow","Programmatic verification of transaction completion","Agent-driven micropayment workflows that need proof-of-payment receipts"],"bestFor":["Developers building x402-compatible payment agents","Applications needing on-chain micropayment receipts on Base","Automated systems that require no-signup, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume batch processing where per-call pricing is cost-prohibitive","Applications requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.621Z"},"updatedAt":"2026-04-24T04:04:20.498Z"}}