{"id":"98a674b1-deeb-43b9-b8ea-7d77e33add1b","shortId":"uJmnKj","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 71) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/71/receipt` accepts POST requests and returns an `application/json` response. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a signed payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the merchant address `0x1A2B…85F3`. The payment scheme is \"exact\" with a 300-second timeout window. No API keys or rate limits are advertised; access is purely gated by micropayment.\n\nThe platform's landing page lists 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schema of this specific receipt endpoint — and the other listed endpoints — cannot be verified from available materials.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","receipt lookup","402 payment required API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) contain no useful content — only a 'Connect wallet' prompt.","No response schema or example response is available for this endpoint.","The specific purpose and data returned by /api/v1/transactions/71/receipt is undocumented and cannot be verified.","The broader platform lists 16 endpoints but none have documented request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/71/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/71/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 there is no documentation, no response schema, no example payloads, and the docs/pricing/README pages are all empty stubs showing only 'Connect wallet'. The purpose of this specific receipt endpoint is unclear beyond its URL 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'/api/v1/transactions/71/receipt':89 '/docs':193 '/pricing':194 '/readme':196 '0.02':10,24,75,126,187 '000':121 '0x1a2b':137 '16':170 '20':120 '300':146 '402 payment required API' '6':131 '71':40 '85f3':138 'Base network API' 'USDC pay-per-call' 'accept':90 'access':158 'across':172 'actual':209 'address':136 'advertis':157 'ai':177 'ai/ml':65 'analyt':64,176 'api':61,151 'application/json':96 'avail':228 'base':8,22,84,122 'base-network' 'behavior':210 'behind':41 'broader':50 'call':77 'caller':105 'cannot':224 'categori':174 'connect':200 'contain':113 'content':206 'data':63,68,175 'decim':132 'document':191 'endpoint':6,20,30,88,171,218,223 'exact':143 'financ':180 'finance/web3':67 'four':173 'gate':3,17,161 'handl':100 'header':112 'howev':190 'id':39 'includ':107 'infer':66 'infrastructur':70,182 'json-response' 'key':152 'land':167 'learn':179 'limit':155 'list':169,222 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':178 'materi':229 'merchant':135 'micropay':163 'must':106 'network':85 'no-api-key' 'offer':53 'page':168,192 'part':47 'pay':9,23,58 'pay-per-request':57 'payment':98,111,116,140 'paywal':44 'per':13,27,59,76 'platform':51,165 'point':189 'post':91 'price':73,188 'prompt':202 'protocol':104 'provid':33 'pure':160 'rate':154 'receipt':5,19,36,217 'receipt lookup' 'request':14,28,60,92 'resourc':37 'respons':97,212 'return':94,197 'schema':213 'scheme':141 'second':147 'settl':79 'sign':115 'sinc':128 'span':62 'specif':87,216 'substant':205 'timeout':148 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':123 'usd':127 'usdc':12,26,81,125,129 'usdc-micropayment' 'use':130 'util':71 'varieti':55 'verifi':226 'via':101 'wallet':201 'web3':181 'window':149 'x':110 'x-payment':109 'x402':2,16,43,103 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"04d8968e-37fc-4aa7-bd10-5910bcaab289","listingId":"98a674b1-deeb-43b9-b8ea-7d77e33add1b","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/71/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":"2026-04-18T19:27:06.451Z"}],"sources":[{"listingId":"98a674b1-deeb-43b9-b8ea-7d77e33add1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/71/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:06.451Z","lastSeenAt":"2026-04-24T00:32:40.207Z"}],"details":{"listingId":"98a674b1-deeb-43b9-b8ea-7d77e33add1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/71/receipt \\\n  -H \"X-PAYMENT: <x402-signed-payment>\" \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/71/receipt"},{"claim":"The platform lists 16 endpoints across four categories all priced at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction ID 71 via micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Agent-driven on-demand data retrieval without pre-registration or API keys"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that need keyless, pay-as-you-go API access on Base","Projects requiring USDC-settled per-call billing without subscriptions"],"notFor":["Users needing free or subscription-based API access","Production workloads requiring documented response schemas and SLAs","Bulk data retrieval where per-request pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.028Z"},"updatedAt":"2026-04-24T00:32:40.207Z"}}