{"id":"7a876fd5-caef-4d2d-8564-f901c2161e56","shortId":"mfu5yH","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 access to a transaction receipt resource (transaction ID 374) via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact payment scheme. The price per call is $0.02 (20,000 base units of USDC 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 $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 specification, no request/response schema documentation, and no example payloads available. The specific endpoint probed (/api/v1/transactions/374/receipt) is not listed on the homepage's API catalog, making its purpose and response format unclear. The x402 challenge confirms the endpoint is live and accepting payment, but what data it actually returns remains undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","transaction-receipt","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available","The /docs, /pricing, /api, and /README pages contain no usable content","This specific endpoint (/api/v1/transactions/374/receipt) is not listed in the provider's own API catalog on the homepage","Response format and request body requirements are completely undocumented","The endpoint appears to be for a single hardcoded transaction ID (374), which limits general utility"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/374/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/374/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on request parameters, response schema, or what the endpoint actually returns. The specific resource path (transactions/374/receipt) is not listed in the site's own API catalog. Docs pages are empty beyond a wallet-connect 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'/api/v1/transactions/374/receipt':197 '/docs':161 '/pricing':163 '/readme':165 '/request':17,34 '0.02':16,33,79,141 '000':81 '0x8335':66 '20':80 '2913':67 '374':51 '6':87 'Base network API' 'USDC micropayment API' 'accept':223 'access':43 'actual':229 'advertis':93 'ai':110 'analysi':114 'analyt':104 'api':101,146,205 'avail':192 'base':9,26,61,82 'base-network' 'broader':90 'call':4,21,77,100 'catalog':206 'challeng':216 'classif':117 'commit':154 'confirm':217 'connect':171 'contract':65 'convers':134 'data':103,107,227 'decim':88 'detail':178 'document':156,187 'embed':118 'enabl':38 'endpoint':7,24,39,137,195,219 'estim':128 'exact':71 'exampl':190 'exchang':123 'export':108 'extrem':158 'feed':122 'financ':119 'format':212 'gas':127 'generat':135 'geocod':132 'homepag':203 'id':50 'infrastructur':130 'insight':109 'key':147 'learn':112 'limit':150 'list':139,200 'live':221 'lowpaymentfee' 'lowpaymentfee.com':41,91 'machin':111 'make':207 'metric':105 'minimum':153 'network':62 'no-api-key' 'openapi':182 'page':166 'pay':2,19,98 'pay-per-cal':1,18,97 'pay-per-call' 'pay-per-request API' 'payload':191 'payment':56,72,224 'per':3,20,76,99,142 'platform':92 'post':54 'price':75,121 'probe':196 'prompt':173 'provid':42 'purpos':209 'quot':126 'rate':124,149 'receipt':6,23,47 'remain':231 'render':168 'report':106 'request':55,143 'request/response':185 'requir':155 'resourc':48 'respons':211 'return':230 'schema':186 'scheme':73 'sentiment':113 'settl':12,29,58 'span':102 'spars':159 'specif':183,194 'suit':95 'summar':116 'technic':177 'text':115 'token':125 'transact':5,22,46,49 'transaction receipt API' 'transaction-receipt' 'unclear':213 'undocu':232 'unit':83 'usdc':14,31,64,85 'usdc-settlement' 'use':63 'util':131 'valid':133 'via':10,27,52 'wallet':172 'web3':120 'x402':11,28,37,70,215 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"0689b686-31e8-42e2-8c15-03552372638d","listingId":"7a876fd5-caef-4d2d-8564-f901c2161e56","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/374/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":"2026-04-18T19:26:34.350Z"}],"sources":[{"listingId":"7a876fd5-caef-4d2d-8564-f901c2161e56","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/374/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:34.350Z","lastSeenAt":"2026-04-24T06:32:43.096Z"}],"details":{"listingId":"7a876fd5-caef-4d2d-8564-f901c2161e56","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/374/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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/374/receipt"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 374 via programmatic pay-per-call access","Demonstrating x402 payment protocol integration on the Base network","Agent-driven micropayment workflows that settle in USDC without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Micropayment use cases where $0.02/request is acceptable"],"notFor":["Production workloads requiring documented request/response schemas","Users who need bulk or subscription-based pricing","Anyone needing detailed API documentation or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.636Z"},"updatedAt":"2026-04-24T06:32:43.096Z"}}