{"id":"7126f7ff-5d2d-4c99-9cf7-515e11983637","shortId":"LWNXtR","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction ID 284) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/transactions/284/receipt) returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme, requiring no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nDocumentation is extremely thin. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The endpoint accepts POST requests and returns application/json, but the structure of the response body is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — response structure is entirely unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","This endpoint is for a specific transaction ID (284); unclear if it generalizes or is a demo","The broader platform advertises many API categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/284/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/284/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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty stubs. The specific purpose of this particular receipt endpoint is unclear beyond its URL path. Effectively a stub 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'/api/v1/transactions/284/receipt':110 '/docs':185 '/pricing':186 '/readme':189 '0.02':92,138 '000':121 '0x8335':126 '20':120 '284':42 '2913':127 '6':133 'Base network API' 'USDC micropayment API' 'accept':223 'access':34 'actual':219 'advertis':51,146 'ai/ml':63 'analysi':66 'analyt':62 'api':59,158 'application/json':228 'attach':169 'base':8,22,100,122,129 'base-network' 'behind':43 'bodi':235 'broader':48 'call':12,26,140 'caller':167 'challeng':115 'classif':68 'commit':166 'connect':195 'consist':141 'contain':220 'content':201 'convers':85 'data':61,71 'decim':134 'document':180,210 'embed':69 'endpoint':6,20,30,88,108,222 'estim':79 'exact':154 'exampl':213 'exchang':74 'extrem':182 'feed':73 'finance/web3':70 'gas':78 'gate':3,17 'generat':86 'geocod':83 'header':174 'id':41 'infer':64 'infrastructur':81 'json-response' 'key':159 'limit':162 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':150 'maxamountrequir':118 'network':101 'no-api-key' 'openapi':205 'page':190 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':218 'payment':148,173,178 'paywal':46 'per':11,25,57,93,139 'per-cal':10,24 'platform':50 'post':224 'price':72,90,147 'probe':109 'prompt':197 'proof':179 'protocol':105 'provid':33 'quot':77 'rate':75,161 'receipt':5,19,39,217 'render':192 'request':58,94,225 'request/response':208 'requir':156 'respons':234 'return':111,227 'schema':209 'scheme':155 'sentiment':65 'settl':95 'simpli':168 'sinc':130 'site':144 'span':60 'spec':206 'specif':37,107 'structur':231 'substant':200 'suit':53 'summar':67 'thin':183 'token':76 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':136 'unit':123 'unknown':237 'upfront':165 'usdc':14,28,97,125,131 'usdc-settlement' 'use':132 'util':82 'valid':84,113,177 'via':102,151 'wallet':196 'x':172 'x-payment':171 'x402':2,16,45,104,114,153 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5719769c-4c72-497e-9a43-40c8ea88efca","listingId":"7126f7ff-5d2d-4c99-9cf7-515e11983637","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/284/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":"2026-04-18T18:59:49.482Z"}],"sources":[{"listingId":"7126f7ff-5d2d-4c99-9cf7-515e11983637","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/284/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:49.482Z","lastSeenAt":"2026-04-24T13:03:15.508Z"}],"details":{"listingId":"7126f7ff-5d2d-4c99-9cf7-515e11983637","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/284/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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/284/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/284/receipt"},{"claim":"All endpoints 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":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 284 via programmatic payment","Demonstrating x402 protocol integration for per-call USDC micropayments","Agent-driven access to paid data endpoints without API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, pay-per-call API access settled in USDC","Prototyping micropayment-gated API workflows"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume batch retrieval where per-call pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.201Z"},"updatedAt":"2026-04-24T13:03:15.508Z"}}