{"id":"b52a2f85-6350-499e-b60c-248abff8aaf3","shortId":"9TAnLW","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 at `/api/v1/transactions/116/receipt`. It is part of a broader platform that offers a variety of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint probed (`/api/v1/transactions/116/receipt`) returned a live 402 challenge with x402 version 1, requesting payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to address 0x1A2B…85F3. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nDocumentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual data returned by this receipt endpoint is unknown — the description \"Premium API Access\" is generic and does not clarify what the receipt contains. The platform appears to be a demonstration or early-stage deployment of x402-gated microservices.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key","exact-scheme"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No API documentation available; /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The specific data returned by this receipt endpoint is undocumented","The endpoint path includes a hardcoded transaction ID (116), suggesting it may be a single-resource demo rather than a parameterized API","Platform appears to be early-stage or a demonstration site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/116/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/116/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the /docs page is empty. The purpose of this specific receipt endpoint is unclear beyond its generic 'Premium API Access' 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'/api/v1/transactions/116/receipt':39,87 '/docs':166 '/pricing':168 '/readme':170 '0.02':10,24,73,112 '000':101 '0x1a2b':115 '0x8335':106 '1':96 '20':100 '2913':107 '300':124 '402':91 '402 payment required' '6':110 '85f3':116 'Base network API' 'USDC pay-per-call' 'accept':129 'access':146,212 'actual':199 'address':114 'advertis':137 'ai/ml':63 'analyt':62 'api':59,139,211 'appear':225 'application/json':134 'attach':149 'avail':197 'base':8,22,81,102,109 'beyond':158 'broader':45 'call':14,28,58 'challeng':92 'clarifi':218 'connect':176 'contain':222 'crypto payment API' 'data':61,66,200 'decim':111 'demonstr':229 'deploy':234 'descript':209 'detail':183 'document':157,192 'earli':232 'early-stag':231 'endpoint':6,20,30,85,128,205 'exact':121 'exact-scheme' 'exampl':195 'extrem':163 'finance/web3':65 'gate':3,17,238 'generic':214 'header':153 'infer':64 'infrastructur':68 'instant':145 'json-response' 'key':140 'land':160 'limit':143 'live':90 'lowpaymentfee' 'lowpaymentfee.com':32 'microservic':239 'network':82 'no-api-key' 'offer':48 'openapi':187 'page':161,171 'part':42 'pay':9,23,56 'pay-per-cal':55 'pay-per-request' 'payload':196 'payment':98,118,152 'per':13,27,57,74 'platform':46,136,224 'post':130 'premium':210 'price':71 'probe':86 'prompt':178 'protocol':54 'provid':33 'rate':142 'receipt':5,19,36,204,221 'render':173 'request':75,97,131,156 'request/response':190 'resourc':37 'return':88,133,201 'schema':191 'scheme':119 'second':125 'settl':76 'simpli':148 'span':60 'spars':164 'spec':188 'specif':84 'stage':233 'technic':182 'timeout':126 'transact':4,18,35 'transaction receipt API' 'transaction-receipt' 'unit':103 'unknown':207 'usdc':12,26,78,105 'usdc-base' 'util':69 'varieti':50 'version':95 'wallet':177 'x402':2,16,53,94,151,237 'x402 micropayment' 'x402-gated':1,15,236 'x402-payment' 'x402-protocol':52","prices":[{"id":"080ccd67-2d07-45ce-abfb-17ef002e4f2e","listingId":"b52a2f85-6350-499e-b60c-248abff8aaf3","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/116/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":"2026-04-18T18:58:24.361Z"}],"sources":[{"listingId":"b52a2f85-6350-499e-b60c-248abff8aaf3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/116/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:24.361Z","lastSeenAt":"2026-04-25T01:32:59.837Z"}],"details":{"listingId":"b52a2f85-6350-499e-b60c-248abff8aaf3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/116/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 with x402 version 1, scheme 'exact', network 'base', maxAmountRequired 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transactions/116/receipt"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction ID 116 via a single micropayment","Demonstrating x402 protocol payment flows for agent-to-API commerce","Integrating pay-per-call receipt lookups into automated financial workflows"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents that need on-demand transaction receipts without API key management","Low-volume, pay-as-you-go access to receipt data"],"notFor":["High-volume bulk receipt retrieval (no documented batch endpoints)","Users needing detailed API documentation or guaranteed SLAs","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.177Z"},"updatedAt":"2026-04-25T01:32:59.837Z"}}