{"id":"f2f2fbfb-e1d7-4dec-af03-832d7a60096e","shortId":"pSMWsB","kind":"x402","title":"Transaction receipt retrieval via x402 micropayment on Base network for $0.02 per request.","tagline":"Transaction receipt retrieval via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource `/api/v1/transactions/331/receipt`) behind an x402 paywall. The provider operates a broader platform offering numerous pay-per-call API endpoints across categories including data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint probed returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 \"exact\" scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The endpoint path suggests it retrieves a receipt for a specific transaction (ID 331), but it is unclear whether this is a demo/sample resource or a pattern for arbitrary transaction IDs.","tags":[],"capabilities":["x402-payment","usdc-base","micropayment","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC payment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Docs, API, pricing, and README pages all render only 'Connect wallet' with no content","Unclear whether /transactions/331/receipt is a fixed demo resource or a parameterized pattern","No information on uptime, SLAs, or data freshness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/331/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/331/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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific resource (transaction 331 receipt) is opaque — it's unclear what data is returned or whether the path is parameterized. Effectively a stub 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'0.02':11,24,72,108 '000':97 '0x8335':102 '20':96 '2913':103 '300':124 '331':206 '402':89 '6':112 'Base network API' 'USDC payment API' 'accept':129 'access':32,143 'across':57 'actual':191 'advertis':142 'ai/ml':62 'analyt':61 'api':55,136,158 'application/json':134 'arbitrari':221 'base':8,21,81,98,105 'behind':39 'broader':47 'call':54 'categori':58 'challeng':90 'connect':167 'contain':192 'content':173 'crypto payment endpoint' 'data':60,65 'decim':113 'demo/sample':215 'doc':157 'document':149,182 'endpoint':28,56,85,128,194 'equal':107 'exact':120 'exampl':185 'extrem':154 'finance/web3':64 'gate':145 'given':109 'id':205,223 'includ':59 'infer':63 'infrastructur':67 'json-response' 'key':137 'limit':140 'lowpaymentfee' 'lowpaymentfee.com':30 'made':116 'micropay':6,19,148 'micropayment' 'network':9,22,82 'no-api-key' 'numer':50 'offer':49 'openapi':177 'oper':45 'page':162 'path':195 'pattern':219 'pay':52 'pay-per-cal':51 'pay-per-call API' 'pay-per-request' 'payload':190 'payment':92,114 'paywal':42 'per':12,25,53,73 'platform':48 'post':130 'price':70,159 'probe':86 'prompt':169 'provid':31,44 'pure':146 'rate':139 'readm':161 'receipt':2,15,36,189,200 'render':164 'request':13,26,74,91,131 'request/response':180 'resourc':37,216 'retriev':3,16,198 'return':87,133 'schema':181 'scheme':121 'second':125 'settl':76 'site':152 'spec':178 'specif':84,203 'substant':172 'suggest':196 'thin':155 'timeout':126 'transact':1,14,35,204,222 'transaction receipt API' 'transaction-receipt' 'unclear':210 'unit':99 'usdc':78,101,110 'usdc-base' 'util':68 'via':4,17,117 'wallet':168 'whether':211 'x402':5,18,41,119 'x402 micropayment' 'x402-payment'","prices":[{"id":"5ed79eca-bc35-4189-bf9c-1c4d26deb604","listingId":"f2f2fbfb-e1d7-4dec-af03-832d7a60096e","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/331/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":"2026-04-18T19:26:11.949Z"}],"sources":[{"listingId":"f2f2fbfb-e1d7-4dec-af03-832d7a60096e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/331/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:11.949Z","lastSeenAt":"2026-04-24T09:04:27.540Z"}],"details":{"listingId":"f2f2fbfb-e1d7-4dec-af03-832d7a60096e","quickStartSnippet":"# 1. Send POST with x402 payment header to get the receipt\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/331/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":"Endpoint returns x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/331/receipt"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/331/receipt"}],"useCases":["Retrieving transaction receipt data via a single micropayment","Demonstrating x402 protocol payment flows on Base","Agent-driven pay-per-call access to financial records"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand transaction receipts without API key management","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["High-volume batch retrieval where per-request fees add up","Users who need detailed API documentation or guaranteed SLAs","Non-crypto users who cannot pay in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.606Z"},"updatedAt":"2026-04-24T09:04:27.540Z"}}