{"id":"662498df-4a2f-4b18-8ae2-36e322c9b819","shortId":"5pRFVt","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 312) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-call 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/312/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment parameters (asset, amount, payTo address) and must include a valid X-PAYMENT header to proceed. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is gated purely 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) all render only a \"Connect wallet\" prompt with no substantive content, so there is no detailed schema documentation, request/response examples, or explanation of what data the receipt endpoint actually returns.","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","crypto payment API","402 payment required"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no actual content","No OpenAPI or schema documentation available for any endpoint","No request body schema or response schema documented — unclear what the receipt contains","The endpoint path references a specific transaction ID (312); it is unclear whether this is parameterized or a single fixed resource","The platform lists 16 endpoints across multiple domains but provides zero documentation for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/312/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/312/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, confirming it works. However, all documentation pages are empty (just 'Connect wallet'), there is no OpenAPI spec, no request/response schema, and no explanation of what the receipt endpoint actually returns. The specific endpoint path (/transactions/312/receipt) appears to be a single hardcoded resource rather than a parameterized API. This is effectively a stub 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'/api/v1/transactions/312/receipt':89 '/docs':186 '/pricing':187 '/readme':189 '0.02':10,24,75,142,180 '000':133 '16':163 '20':132 '312':40 '402':106 '402 payment required' '6':138 'Base network API' 'USDC pay-per-call' 'accept':90 'access':151 'across':165 'actual':218 'address':115 'advertis':150 'ai':170 'ai/ml':65 'amount':113,129 'analyt':64,169 'api':61,144 'asset':112 'base':8,22,84,134 'base-network' 'behind':41 'broader':50 'call':60 'caller':103 'categori':167 'challeng':107 'connect':194 'contain':108 'content':200 'crypto payment API' 'data':63,68,168,214 'decim':139 'detail':205 'document':184,207 'endpoint':6,20,30,88,164,217 'equal':141 'exampl':209 'explan':211 'financ':173 'finance/web3':67 'four':166 'gate':3,17,153 'handl':98 'header':124 'howev':183 'id':39 'includ':118 'infer':66 'infrastructur':70,175 'json':95 'json-response' 'key':145 'land':160 'learn':172 'limit':148 'list':162 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':171 'max':128 'micropay':156 'must':117 'network':85 'no-api-key' 'offer':53 'page':161,185 'paramet':111 'part':47 'pay':9,23,58 'pay-per-cal':57 'pay-per-request' 'payment':96,110,123 'payto':114 'paywal':44 'per':13,27,59,76 'platform':51,158 'point':182 'post':91 'price':73,181 'proceed':126 'prompt':196 'protocol':102 'provid':33 'pure':154 'rate':147 'receipt':5,19,36,216 'receiv':104 'render':191 'request':14,28,77,92 'request/response':208 'requir':130 'resourc':37 'return':94,219 'schema':206 'settl':79 'span':62 'specif':87 'substant':199 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':135 'usdc':12,26,81,137 'usdc-micropayment' 'util':71 'valid':120 'varieti':55 'via':99 'wallet':195 'web3':174 'x':122 'x-payment':121 'x402':2,16,43,101 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c22eb5c3-4cc8-4a02-91fd-e93c5c054ca1","listingId":"662498df-4a2f-4b18-8ae2-36e322c9b819","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/312/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":"2026-04-18T19:26:01.067Z"}],"sources":[{"listingId":"662498df-4a2f-4b18-8ae2-36e322c9b819","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/312/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:01.067Z","lastSeenAt":"2026-04-24T10:33:28.007Z"}],"details":{"listingId":"662498df-4a2f-4b18-8ae2-36e322c9b819","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/312/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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/312/receipt"},{"claim":"All APIs 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 lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 312 via micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Agent-driven programmatic access to paid data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-volume batch retrieval where per-request fees add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.135Z"},"updatedAt":"2026-04-24T10:33:28.007Z"}}