{"id":"fbcfd898-db0c-493a-b915-10ff5d7e1a05","shortId":"pHvqtN","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 159) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint probed — `/api/v1/transactions/159/receipt` — returned a valid x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json.\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. The nature of what the \"Premium API Access\" receipt endpoint actually returns is unclear — it may be a demo or placeholder resource rather than a production data service.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment","Base network API","transaction receipt","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific endpoint '/api/v1/transactions/159/receipt' labeled 'Premium API Access' has unclear purpose — may be a demo or placeholder","Cannot verify what data the endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/159/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/159/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 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific receipt endpoint is unclear, and all doc pages render only a wallet-connect 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'/api/v1/transactions/159/receipt':115 '/docs':180 '/pricing':182 '/readme':184 '0.02':90,144 '000':127 '0x8335':132 '159':40 '20':126 '2913':133 '402':122 '6':139 'Base network API' 'USDC micropayment' 'accept':169 'access':219 'actual':222 'address':166 'advertis':49,152 'ai/ml':61 'analysi':64 'analyt':60 'api':57,102,218 'application/json':174 'avail':211 'base':8,22,98,128,135 'base-network' 'behind':41 'broader':46 'call':12,26,146 'challeng':120 'classif':66 'commit':110 'connect':190 'consist':147 'convers':83 'crypto payment API' 'data':59,69,238 'decim':140 'demo':230 'detail':197 'document':175,206 'embed':67 'endpoint':6,20,30,86,113,168,221 'estim':77 'exact':160 'exampl':210 'exchang':72 'extrem':177 'feed':71 'finance/web3':68 'gas':76 'gate':3,17 'generat':84 'geocod':81 'http':121 'id':39 'infer':62 'infrastructur':79 'json-response' 'key':103 'limit':106 'lowpaymentfee' 'lowpaymentfee.com':32,47 'made':156 'may':227 'minimum':109 'natur':213 'network':99 'no-api-key' 'openapi':201 'page':185 'paid':9,23 'pay':54 'pay-per-call API' 'pay-per-request':53 'payment':154 'payto':165 'paywal':44 'per':11,25,55,91,145 'per-cal':10,24 'per-request-pricing' 'placehold':232 'platform':48 'post':170 'premium':217 'price':70,88,153 'probe':114 'product':237 'prompt':192 'provid':33 'quot':75 'rate':73,105 'rather':234 'receipt':5,19,36,220 'render':187 'request':56,92,123,171 'request/response':204 'resourc':37,233 'return':116,173,223 'schema':205 'scheme':161 'sentiment':63 'servic':239 'settl':93 'sinc':136 'site':150 'span':58 'spars':178 'spec':202 'specif':112 'specifi':164 'suit':51 'summar':65 'technic':196 'token':74 'transact':4,18,35,38 'transaction receipt' 'transaction-receipt' 'translat':142 'unclear':225 'unit':129 'usag':209 'usdc':14,28,95,131,137 'usdc-settlement' 'use':138 'util':80 'valid':82,118 'via':157 'wallet':191 'x402':2,16,43,119,159 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"87ffb2a1-0b07-4314-b2b3-900b65b8fcfe","listingId":"fbcfd898-db0c-493a-b915-10ff5d7e1a05","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/159/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":"2026-04-18T18:58:38.189Z"}],"sources":[{"listingId":"fbcfd898-db0c-493a-b915-10ff5d7e1a05","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/159/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:38.189Z","lastSeenAt":"2026-04-24T22:32:56.178Z"}],"details":{"listingId":"fbcfd898-db0c-493a-b915-10ff5d7e1a05","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/159/receipt\n# Returns HTTP 402 with x402 challenge.\n# Attach X-PAYMENT header with a signed USDC payment ($0.02 on Base) to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transactions/159/receipt"},{"claim":"All endpoints are 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":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt via a single micropayment in USDC","Demonstrating x402 payment protocol integration on Base","Agent-driven pay-per-use API consumption without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Testing USDC micropayment flows"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","High-volume batch processing where per-call fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.526Z"},"updatedAt":"2026-04-24T22:32:56.178Z"}}