{"id":"e56ab94e-bd4f-4a7e-98b6-6ad15739d6e2","shortId":"tnpPk5","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 316) 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/316/receipt` accepts POST requests and returns JSON. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required — callers simply attach the X-PAYMENT header with a valid payment proof.\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, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The actual behavior and response format of this particular receipt endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt","payment receipt","x402 API","USDC micropayment","Base network API","pay-per-call","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content.","The specific purpose and data returned by /api/v1/transactions/316/receipt is undocumented.","This appears to be a single hard-coded transaction ID (316); unclear if other transaction IDs are supported."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/316/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/316/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no example requests or responses, and the docs/pricing/README pages are all empty stubs. The specific purpose of this receipt endpoint is unclear beyond its URL 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'0.02':10,24,75,114,173 '000':104 '0x8335':109 '16':156 '20':103 '316':40 '6':118 'Base network API' 'USDC micropayment' 'accept':90 'across':158 'actual':209 'advertis':99 'ai':163 'ai/ml':65 'analyt':64,162 'api':61,130,192 'attach':139 'base':8,22,84,105,111 'base-network' 'behavior':210 'behind':41 'broader':50 'call':77 'caller':137 'categori':160 'challeng':98 'connect':201 'content':207 'crawl':189 'data':63,68,161 'decim':119 'detail':180 'doc':191 'document':181 'endpoint':6,20,30,88,157,218 'equal':113 'exact':126 'exampl':183 'financ':166 'finance/web3':67 'format':213 'found':187 'four':159 'gate':3,17 'given':115 'header':144 'howev':176 'id':39 'infer':66 'infrastructur':70,168 'json':95 'json-response' 'key':131 'land':153 'learn':165 'limit':133 'list':155 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':164 'made':122 'maxamountrequir':101 'network':85 'no-api-key' 'offer':53 'openapi':178 'page':154,196 'part':47 'particular':216 'pay':9,23,58 'pay-per-call' 'pay-per-request':57 'payload':185 'payment':120,143,148 'payment receipt' 'paywal':44 'per':13,27,59,76 'platform':51,151 'point':175 'post':91 'price':73,174,193 'prompt':203 'proof':149 'provid':33 'rate':132 'readm':195 'receipt':5,19,36,217 'remain':219 'request':14,28,60,92 'request/response':184 'requir':136 'resourc':37 'respons':212 'return':94,198 'schema':179 'scheme':127 'settl':79 'simpli':138 'span':62 'specif':87 'subscript':135 'substant':206 'transact':4,18,35,38 'transaction receipt' 'transaction-receipt' 'undocu':220 'unit':106 'usdc':12,26,81,108,116 'usdc-settlement' 'util':71 'valid':147 'varieti':55 'via':123 'wallet':202 'web3':167 'x':142 'x-payment':141 'x402':2,16,43,97,125 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"575b0df7-46bf-40f8-85b1-d75d9a6d8400","listingId":"e56ab94e-bd4f-4a7e-98b6-6ad15739d6e2","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/316/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":"2026-04-18T19:25:53.175Z"}],"sources":[{"listingId":"e56ab94e-bd4f-4a7e-98b6-6ad15739d6e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/316/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:53.175Z","lastSeenAt":"2026-04-24T11:32:47.926Z"}],"details":{"listingId":"e56ab94e-bd4f-4a7e-98b6-6ad15739d6e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/316/receipt \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/316/receipt"},{"claim":"The platform lists 16 endpoints across four categories all priced at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 316 via a single paid API call","Programmatic access to receipt data without API key management","Agent-driven workflows that need on-chain-settled, per-request payment"],"bestFor":["Developers exploring x402 payment flows on Base","Agents that need keyless, pay-per-use API access","Prototyping micropayment-gated receipt retrieval"],"notFor":["Production use requiring documented request/response schemas","Bulk or high-volume receipt retrieval (no batch endpoint documented)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.545Z"},"updatedAt":"2026-04-24T11:32:47.926Z"}}