{"id":"2c580b39-b507-48e2-8546-90949bacb4b6","shortId":"2ZTX62","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 API. The specific resource `/api/v1/transactions/199/receipt` returns receipt data for transaction ID 199 in JSON format. Payment is handled inline via the x402 protocol: callers attach a USDC payment on the Base network in the `X-PAYMENT` header, and the endpoint returns the receipt data upon successful settlement.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers multiple pay-per-call API categories including data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe x402 challenge for this specific endpoint advertises a `maxAmountRequired` of 20,000 base units of USDC (contract `0x8335...2913` on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. No OpenAPI spec or detailed documentation was found beyond the landing page listings; the docs, API, pricing, and README pages all returned only a wallet-connect prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All doc/pricing/README pages return only a wallet-connect prompt with no substantive content","The endpoint path references a specific transaction ID (199); it is unclear whether this is a generic pattern or a fixed resource","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/199/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/199/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages return only a wallet-connect prompt. The specific purpose of this particular receipt endpoint is unclear beyond the generic 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'/request':17,34 '0.02':16,33,149,187 '000':175 '0x8335':181 '199':58 '20':174 '2913':182 '300':200 '6':191 'Base network API' 'USDC micropayment API' 'advertis':170 'ai':116 'analysi':120 'analyt':115 'api':47,111,154,218 'attach':71 'base':9,26,77,176,184 'base-network' 'beyond':211 'broader':101 'call':4,21,110 'caller':70 'categori':112 'challeng':165 'classif':122 'commit':162 'connect':229 'content':234 'contract':180 'convers':139 'crypto payment API' 'data':54,91,114 'decim':192 'detail':207 'doc':217 'document':208 'embed':123 'enabl':38 'endpoint':7,24,39,87,96,142,169 'equal':186 'estim':133 'exact':197 'exchang':128 'feed':127 'financ':124 'format':61 'found':210 'gas':132 'generat':140 'geocod':137 'given':188 'handl':64 'header':84 'id':57 'includ':113 'infrastructur':135 'inlin':65 'json':60 'json-response' 'key':155 'land':213 'learn':118 'limit':158 'list':215 'lowpaymentfee' 'lowpaymentfee.com':41,103 'machin':117 'maxamountrequir':172 'minimum':161 'multipl':106 'network':78 'no-api-key' 'offer':105 'openapi':204 'page':214,222 'part':98 'pay':2,19,108 'pay-per-cal':1,18,107 'pay-per-call' 'pay-per-request API' 'payment':62,74,83,194 'per':3,20,109,150 'platform':102,145 'price':126,147,219 'prompt':230 'protocol':69 'provid':42 'quot':131 'rate':129,157 'readm':221 'receipt':6,23,45,53,90 'request':151 'resourc':50 'retriev':46 'return':52,88,224 'scheme':195 'second':201 'sentiment':119 'settl':12,29 'settlement':94 'spec':205 'specif':49,168 'substant':233 'success':93 'summar':121 'timeout':202 'token':130 'transact':5,22,44,56 'transaction receipt API' 'transaction-receipt' 'unit':177 'upon':92 'usdc':14,31,73,179,189 'usdc-settlement' 'util':136 'valid':138 'via':10,27,66 'wallet':228 'wallet-connect':227 'web3':125 'x':82 'x-payment':81 'x402':11,28,37,68,164 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"994e8ad9-e18a-4cd8-ac33-1e18a85ccdfc","listingId":"2c580b39-b507-48e2-8546-90949bacb4b6","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/199/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":"2026-04-18T18:59:09.662Z"}],"sources":[{"listingId":"2c580b39-b507-48e2-8546-90949bacb4b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/199/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:09.662Z","lastSeenAt":"2026-04-24T18:33:04.622Z"}],"details":{"listingId":"2c580b39-b507-48e2-8546-90949bacb4b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/199/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":"The platform lists all endpoints 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 x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/199/receipt"},{"claim":"The platform offers categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipt data on a per-call payment basis","Integrating pay-per-use API access into agent workflows without API key management","Programmatic access to transaction records settled via USDC on Base"],"bestFor":["Agents or applications needing keyless, pay-per-call API access","Developers who want to avoid subscription commitments for occasional API calls","Crypto-native workflows already operating on the Base network"],"notFor":["High-volume use cases where per-call pricing may add up versus flat-rate plans","Users without access to USDC on the Base network for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.029Z"},"updatedAt":"2026-04-24T18:33:04.622Z"}}