{"id":"fc793f14-7c87-43f0-8912-325fcf8efa02","shortId":"8xe7PJ","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 172) 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/172/receipt) returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The platform's landing page lists many API paths but provides no detail on request parameters or response formats for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call API"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response body","This endpoint is for a specific transaction ID (172); unclear if it generalizes","The broader platform lists many endpoints but none have documented schemas","Cannot verify what data the receipt actually contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/172/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/172/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 there is zero documentation on request parameters or response format. The /docs, /pricing, and /README pages are empty beyond a wallet connect prompt. No OpenAPI spec exists. The specific endpoint (transaction 172 receipt) is narrow and its utility is unclear without schema 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'/api/v1/transactions/172/receipt':110 '/docs':166 '/pricing':167 '/readme':170 '0.02':92,132 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':126 '172':42 '20':120 '2913':127 '300':150 '6':136 'Base network API' 'USDC micropayment API' 'accept':155 'access':34 'actual':200 'address':146 'advertis':51 'ai/ml':63 'analysi':66 'analyt':62 'api':59,209 'application/json':160 'base':8,22,100,122,129 'base-network' 'behind':43 'broader':48 'call':12,26 'challeng':115 'classif':68 'connect':176 'contain':201 'content':182 'convers':85 'data':61,71 'decim':137 'detail':214 'document':161,191 'embed':69 'endpoint':6,20,30,88,108,154 'equal':131 'estim':79 'exact':143 'exampl':194 'exchang':74 'extrem':163 'feed':73 'finance/web3':70 'format':220 'gas':78 'gate':3,17 'generat':86 'geocod':83 'given':133 'id':41 'infer':64 'infrastructur':81 'json-response' 'land':205 'list':207 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':140 'mani':208 'maxamountrequir':118 'network':101 'no-api-key' 'openapi':186 'page':171,206 'paid':9,23 'paramet':217 'path':210 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':199 'payment':138 'paywal':46 'per':11,25,57,93 'per-cal':10,24 'platform':50,203 'post':156 'price':72,90 'probe':109 'prompt':178 'protocol':105 'provid':33,212 'quot':77 'rate':75 'receipt':5,19,39,198 'render':173 'request':58,94,157,216 'request/response':189 'respons':219 'return':111,159 'schema':190 'scheme':144 'second':151 'sentiment':65 'settl':95 'span':60 'spars':164 'spec':187 'specif':37,107 'suit':53 'summar':67 'timeout':152 'token':76 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unit':123 'usdc':14,28,97,125,134 'usdc-settlement' 'util':82 'valid':84,113 'via':102,141 'wallet':177 'x402':2,16,45,104,114 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d49aa538-a3e0-4e89-8b83-b4fe037a81e8","listingId":"fc793f14-7c87-43f0-8912-325fcf8efa02","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/172/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":"2026-04-18T18:58:50.965Z"}],"sources":[{"listingId":"fc793f14-7c87-43f0-8912-325fcf8efa02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/172/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:50.965Z","lastSeenAt":"2026-04-25T15:32:51.066Z"}],"details":{"listingId":"fc793f14-7c87-43f0-8912-325fcf8efa02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/172/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment proof to access the receipt.","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/172/receipt"},{"claim":"The platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories all priced at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/172/receipt"},{"claim":"Platform advertises no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 172 via a single micropayment","Programmatic access to paid API endpoints without API key management","Agent-driven data retrieval with on-chain USDC settlement"],"bestFor":["Developers exploring x402 protocol integrations","Agents that can settle USDC payments on Base","Use cases requiring keyless, pay-per-call API access"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","High-volume batch retrieval where per-call pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.932Z"},"updatedAt":"2026-04-25T15:32:51.066Z"}}