{"id":"e9ce641e-303b-45ac-a1fc-81293b60b9b2","shortId":"J54JWx","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per call.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per call.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource 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 request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/8/receipt` returns a JSON response (MIME type `application/json`) when a valid x402 payment header is supplied. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme. The endpoint accepts POST requests and is marked as discoverable.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all appear to require a wallet connection and contain no additional content beyond that prompt, so details about request/response schemas, available parameters, or the exact structure of the receipt payload are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment gateway"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only a 'Connect wallet' prompt with no usable content.","No request or response schema is available — the payload structure of the receipt is unknown.","The endpoint path includes a hardcoded transaction ID ('8'), suggesting it may be a demo or placeholder rather than a general-purpose API.","The broader platform lists many API categories (AI, analytics, finance, utilities) but none could be verified beyond the landing page descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/8/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/8/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 documentation beyond a wallet-connect prompt, no example request/response payloads, and the specific purpose of the 'transactions/8/receipt' resource is unclear. This is effectively a stub 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'/api/v1/transactions/8/receipt':86 '/docs':162 '/pricing':163 '/readme':165 '0.02':10,24,72,122 '000':111 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':133 '0x8335':116 '20':110 '2913':117 '6':126 'Base network API' 'USDC micropayment API' 'accept':140 'access':159 'addit':176 'address':132 'advertis':105,150 'ai/ml':62 'amount':108 'analyt':61 'api':58,152 'appear':167 'application/json':93 'avail':186 'base':8,22,81,112,119 'behind':38 'beyond':178 'broader':47 'call':14,28 'challeng':104 'connect':172 'contain':174 'content':177 'crypto payment gateway' 'data':60,65 'decim':127 'detail':182 'discover':147 'document':160 'endpoint':6,20,30,85,139 'equal':121 'exact':136,190 'finance/web3':64 'gate':3,17 'given':123 'header':99 'infer':63 'infrastructur':67 'instant':158 'json':89 'json-response' 'key':153 'limit':156 'lowpaymentfee' 'lowpaymentfee.com':32 'mark':145 'max':107 'mime':91 'network':82 'no-api-key' 'offer':50 'page':161 'paramet':187 'part':44 'pay':9,23,55 'pay-per-call API' 'pay-per-request':54 'payload':195 'payment':98,128 'paywal':41 'per':13,27,56,73 'platform':48,149 'post':141 'price':70 'prompt':180 'provid':33 'rate':155 'receipt':5,19,36,194 'request':57,74,142 'request/response':184 'requir':169 'resourc':37 'respons':90 'return':87 'schema':185 'scheme':137 'sent':130 'settl':76 'span':59 'specif':84 'structur':191 'suppli':101 'transact':4,18,35 'transaction receipt API' 'transaction-receipt' 'type':92 'unit':113 'unknown':197 'usdc':12,26,78,115,124 'usdc-base' 'use':134 'util':68 'valid':96 'varieti':52 'wallet':171 'x402':2,16,40,97,103 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0651621d-5f1f-4d18-8b2d-eadca1693862","listingId":"e9ce641e-303b-45ac-a1fc-81293b60b9b2","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/8/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":"2026-04-18T19:27:03.988Z"}],"sources":[{"listingId":"e9ce641e-303b-45ac-a1fc-81293b60b9b2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/8/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:03.988Z","lastSeenAt":"2026-04-24T01:32:49.642Z"}],"details":{"listingId":"e9ce641e-303b-45ac-a1fc-81293b60b9b2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/8/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/8/receipt"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/8/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for a specific transaction ID via programmatic payment","Demonstrating x402 protocol integration for pay-per-request APIs","Building agent workflows that need on-chain proof-of-payment receipts"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing low-cost, keyless API access settled in USDC","Applications requiring transaction receipt data without subscription commitments"],"notFor":["Users who need detailed API documentation or schema definitions before integrating","High-throughput batch processing where per-request crypto settlement adds latency","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.142Z"},"updatedAt":"2026-04-24T01:32:49.642Z"}}