{"id":"3e20e9f2-7457-4e3e-9587-0bfc3760d1d3","shortId":"UdnCuR","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 access to a transaction receipt (transaction ID 87) 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 via the x402 protocol — no API keys, no rate limits, no subscriptions.\n\nThe specific endpoint being listed (`/api/v1/transactions/87/receipt`) accepts POST requests and returns JSON. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment scheme is \"exact\" with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 USDC endpoint","pay-per-call API","Base network API","lowpaymentfee","micropayment API","crypto payment gateway"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be inferred from the x402 challenge alone","Docs, pricing, and API pages returned no usable content beyond 'Connect wallet'","Endpoint path is hardcoded to transaction ID 87; unclear if other transaction IDs are available or how to discover them","No example responses available; actual response format is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/87/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/87/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, but no OpenAPI schema, no example request/response bodies, and no meaningful documentation were found. The docs/pricing/API pages all render only a wallet-connect prompt. The endpoint path suggests a single fixed resource (transaction 87) rather than a parameterized API, limiting its general 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'0.02':91,141 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '20':135 '300':163 '6':146 '87':41 'Base network API' 'accept':119 'access':34 'addit':194 'address':152 'advertis':50 'ai/ml':62 'analysi':65 'analyt':61 'api':58,106,183 'base':8,22,99,137,155 'behind':42 'broader':47 'call':12,26,149 'challeng':127 'classif':67 'confirm':128 'connect':189 'content':195 'convers':84 'crawl':178 'crypto payment gateway' 'data':60,70 'decim':147 'detail':169 'doc':180 'document':170 'embed':68 'endpoint':6,20,30,87,115 'estim':78 'exact':160 'exampl':172 'exchang':73 'feed':72 'finance/web3':69 'found':175 'gas':77 'gate':3,17 'generat':85 'geocod':82 'id':40 'infer':63 'infrastructur':80 'json':124 'json-response' 'key':107 'limit':110 'list':117 'live':131 'lowpaymentfee' 'lowpaymentfee.com':32,48 'micropayment API' 'network':100 'no-api-key' 'openapi':167 'page':184 'paid':9,23,150 'pay':55 'pay-per-call API' 'pay-per-request':54 'payment':157 'paywal':45 'per':11,25,56,92,148 'per-cal':10,24 'platform':49 'post':120 'price':71,89,181 'prompt':191 'protocol':104 'provid':33 'quot':76 'rate':74,109 'receipt':5,19,38 'request':57,93,121,132 'respons':173 'return':123,186 'schema':168 'scheme':158 'second':164 'sentiment':64 'settl':94 'sinc':143 'span':59 'specif':114 'subscript':112 'suit':52 'summar':66 'timeout':165 'token':75 'transact':4,18,37,39 'transaction receipt API' 'transaction-receipt' 'unit':138 'usd':142 'usdc':14,28,96,140,144 'usdc-base' 'use':145 'util':81 'valid':83 'via':101 'wallet':190 'x402':2,16,44,103,126 'x402 USDC endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"17c8937f-4177-438f-88f5-ebec9102fed4","listingId":"3e20e9f2-7457-4e3e-9587-0bfc3760d1d3","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/87/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":"2026-04-18T19:27:13.073Z"}],"sources":[{"listingId":"3e20e9f2-7457-4e3e-9587-0bfc3760d1d3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/87/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:13.073Z","lastSeenAt":"2026-04-23T23:03:17.218Z"}],"details":{"listingId":"3e20e9f2-7457-4e3e-9587-0bfc3760d1d3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/87/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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/87/receipt"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/87/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 87 via a single paid API call","Demonstrating x402 protocol integration for pay-per-request workflows","Programmatic access to transaction data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing one-shot paid data retrieval without subscriptions","Low-friction access to transaction receipts with USDC micropayments"],"notFor":["Bulk retrieval of many transaction receipts (single fixed transaction ID)","Users who need detailed API documentation or OpenAPI specs before integrating","Non-crypto users who cannot pay in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.703Z"},"updatedAt":"2026-04-23T23:03:17.218Z"}}