{"id":"723ed52f-a7f0-494f-826f-b310dbe8736a","shortId":"Z93wYD","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt for transaction ID 88. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/88/receipt` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, advertising a max amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 \"exact\" scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to settle each request.\n\nThe platform's landing page lists additional endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All share the same $0.02 pricing. However, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this and other endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","transaction-receipt","json-response","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto payment API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no technical content","The endpoint path references a hardcoded transaction ID (88); unclear if this is parameterized or a single fixed resource","No request body schema or response schema is documented anywhere","The endpoint is not listed among the platform's advertised APIs on the landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/88/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/88/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 and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, and all docs pages return only a wallet-connect prompt. The specific endpoint path (/transactions/88/receipt) is narrow and not listed on the landing page, making its purpose unclear beyond the generic 'Premium API Access' 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'/request':17,34 '0.02':16,33,80,128,203 '000':115 '0x8335':120 '20':114 '2913':121 '6':124 '88':51 'Base network API' 'USDC pay-per-call' 'accept':95 'access':46 'across':165 'actual':225 'addit':163 'advertis':109 'ai':174 'ai/ml':70 'amount':112 'analysi':178 'analyt':69,169 'api':45,66,139 'attach':147 'base':9,26,89,116,123 'base-network' 'beyond':208 'broader':57 'call':4,21,65 'caller':145 'categori':167 'challeng':103 'classif':181 'confirm':104 'connect':215 'convers':197 'crypto payment API' 'data':68,73,168 'decim':125 'detail':222 'document':206 'dozen':60 'embed':182 'enabl':38 'endpoint':7,24,39,93,106,164,232 'equal':127 'estim':192 'exact':135 'exchang':187 'export':172 'feed':186 'financ':183 'finance/web3':72 'four':166 'gas':191 'generat':198 'geocod':195 'header':152 'howev':205 'id':50 'infer':71 'infrastructur':194 'insight':173 'json':100 'json-response' 'key':140 'land':160,210 'learn':176 'limit':143 'list':162 'live':108 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':175 'made':131 'max':111 'metric':170 'network':90 'no-api-key' 'no-rate-limit' 'offer':59 'page':161,207,211 'part':54 'pay':2,19,63 'pay-per-cal':1,18,62 'pay-per-call' 'payment':129,151 'per':3,20,64,81 'platform':58,158 'post':96 'premium':44 'premium API access' 'price':78,185,204 'prompt':217 'provid':42 'quot':190 'rate':142,188 'receipt':6,23,47 'remain':233 'report':171 'request':82,97,156 'request/response':226 'requir':144 'return':99,212 'schema':227 'scheme':136 'sentiment':177 'servic':76 'settl':12,29,84,154 'share':200 'simpli':146 'span':67 'specif':92 'summar':180 'technic':221 'text':179 'token':189 'transact':5,22,49 'transaction receipt API' 'transaction-receipt' 'undocu':234 'unit':117 'usdc':14,31,86,119 'usdc-settlement' 'util':75 'valid':196 'via':10,27,132 'wallet':216 'web3':184 'x':150 'x-payment':149 'x402':11,28,37,102,134 'x402 micropayment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"6e2a1b5b-84b1-4f9b-90a0-9287bdd968fe","listingId":"723ed52f-a7f0-494f-826f-b310dbe8736a","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/88/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":"2026-04-18T19:27:09.434Z"}],"sources":[{"listingId":"723ed52f-a7f0-494f-826f-b310dbe8736a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/88/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:09.434Z","lastSeenAt":"2026-04-24T00:32:40.341Z"}],"details":{"listingId":"723ed52f-a7f0-494f-826f-b310dbe8736a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/88/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/88/receipt"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 88 via a single paid API call","Demonstrating x402 payment flows for agent-to-agent commerce on Base","Integrating pay-per-use API access without managing API keys or subscriptions"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents needing simple pay-per-call endpoints settled in USDC on Base","Projects that want keyless, zero-commitment API access"],"notFor":["Production workloads requiring detailed API documentation and guaranteed SLAs","Users who need free or subscription-based pricing models","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.867Z"},"updatedAt":"2026-04-24T00:32:40.341Z"}}