{"id":"0c69115a-b6ad-438a-97d3-967d00e526b4","shortId":"3DwGYD","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource ID 173) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (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 with no API keys, no rate limits, and no commitments required.\n\nThe specific probed endpoint (`/api/v1/transactions/173/receipt`) returns 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 x402 \"exact\" scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json. Documentation 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, schemas, or example payloads.\n\nBecause there is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains, the practical utility of this specific endpoint is difficult to assess without making a paid call. The platform appears live and the x402 challenge is well-formed, but the lack of documentation is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","per-call-pricing","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","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/173/receipt appears to be for a single hardcoded resource ID (173); unclear if this generalizes","No examples of successful response payloads are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/173/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/173/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples of what the receipt payload contains. The /docs and other pages are empty. This is effectively a stub 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'/api/v1/transactions/173/receipt':111 '/docs':169 '/pricing':171 '/readme':173 '0.02':86,133 '000':122 '0x8335':127 '173':39 '20':121 '2913':128 '6':137 'Base network API' 'USDC micropayment API' 'accept':154 'access':32 'actual':209 'address':151 'advertis':48 'ai':56 'analysi':60 'analyt':55 'api':52,98 'appear':229 'application/json':159 'assess':221 'base':5,18,94,123,130 'base-network' 'behind':40 'beyond':161 'broader':45 'call':9,22,226 'challeng':116,234 'classif':62 'commit':105 'connect':179 'contain':210 'convers':79 'crypto payment API' 'data':54 'decim':138 'detail':186 'difficult':219 'document':160,200,243 'embed':63 'endpoint':3,16,28,82,110,153,217 'equal':132 'estim':73 'exact':145 'exampl':189,203 'exchang':68 'extrem':166 'feed':67 'financ':64 'form':238 'gap':247 'gas':72 'generat':80 'geocod':77 'given':134 'id':38 'infrastructur':75 'json-response' 'key':99 'lack':241 'land':163 'learn':58 'limit':102 'live':230 'lowpaymentfee' 'lowpaymentfee.com':30,46 'machin':57 'made':141 'make':223 'maxamountrequir':119 'network':95 'no-api-key' 'openapi':195 'page':164,174 'paid':6,19,225 'pay-per-call API' 'payload':190,208 'payment':139 'payto':150 'paywal':43 'per':8,21,87 'per-cal':7,20 'per-call-pricing' 'platform':47,228 'post':155 'practic':212 'price':66,84 'probe':109 'prompt':181 'provid':31 'quot':71 'rate':69,101 'receipt':2,15,36,207 'render':176 'request':88,156 'request/response':198 'requir':106 'resourc':37 'return':112,158 'schema':187,199 'scheme':146 'sentiment':59 'settl':89 'signific':246 'span':53 'spars':167 'spec':196 'specif':108,216 'specifi':149 'suit':50 'summar':61 'technic':185 'token':70 'transact':1,14,35 'transaction receipt API' 'transaction-receipt' 'unit':124 'usdc':13,26,91,126,135 'usdc-settlement' 'util':76,213 'valid':78,114 'via':10,23,142 'wallet':180 'web3':65 'well':237 'well-form':236 'without':222 'x402':11,24,42,115,144,233 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"56e13f06-f062-4eca-b9fa-57d25e2c3593","listingId":"0c69115a-b6ad-438a-97d3-967d00e526b4","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/173/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":"2026-04-18T18:58:58.837Z"}],"sources":[{"listingId":"0c69115a-b6ad-438a-97d3-967d00e526b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/173/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:58.837Z","lastSeenAt":"2026-04-24T20:03:14.145Z"}],"details":{"listingId":"0c69115a-b6ad-438a-97d3-967d00e526b4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/173/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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/173/receipt"},{"claim":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt by paying $0.02 in USDC on Base","Demonstrating x402 protocol payment flows for agent-to-API commerce","Accessing paid API endpoints without traditional API key registration"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-per-call API access"],"notFor":["Users needing detailed API documentation or request/response schemas before purchasing","High-volume batch processing where per-call crypto settlement adds overhead","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.522Z"},"updatedAt":"2026-04-24T20:03:14.145Z"}}