{"id":"cbeff944-c2f3-439b-b886-ff0440db0455","shortId":"VdfmYB","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 236) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI/ML inference (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.\n\nThe specific endpoint probed — /api/v1/transactions/236/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 x402 \"exact\" scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json. Documentation beyond the landing page is extremely thin: 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 the endpoint path suggests a specific transaction receipt rather than a general-purpose API, its utility to arbitrary callers is unclear. The broader platform's advertised capabilities (AI, finance, analytics, utilities) are not documented with request/response schemas, so it is difficult to evaluate what data is actually returned. Treat this listing as a stub until richer documentation becomes available.","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","lowpaymentfee","Base network API","pay-per-call API","crypto payment endpoint"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) contain no usable content beyond 'Connect wallet'","No request or response schema available — actual payload structure is unknown","Endpoint path references a specific resource ID (236); unclear if this is a general-purpose endpoint or a single fixed resource","The broader platform advertises many API categories (AI, finance, analytics) but none are documented with schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/236/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/236/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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The specific endpoint path (/transactions/236/receipt) suggests a narrow resource rather than a general-purpose API, and its actual output is 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'/api/v1/transactions/236/receipt':109 '/docs':167 '/pricing':169 '/readme':171 '0.02':85,131 '000':120 '0x8335':125 '20':119 '236':39 '2913':126 '6':135 'Base network API' 'USDC micropayment API' 'accept':152 'access':32 'actual':237 'address':149 'advertis':48,216 'ai':218 'ai/ml':56 'analysi':59 'analyt':55,220 'api':52,97,204 'application/json':157 'arbitrari':208 'avail':249 'base':5,18,93,121,128 'base-network' 'becom':248 'behind':40 'beyond':159 'broader':45,213 'call':9,22 'caller':209 'capabl':217 'challeng':114 'classif':61 'commit':104 'connect':177 'convers':78 'crypto payment endpoint' 'data':54,235 'decim':136 'detail':184 'difficult':231 'document':158,224,247 'embed':62 'endpoint':3,16,28,81,107,151,191 'equal':130 'estim':72 'evalu':233 'exact':143 'exampl':187 'exchang':67 'extrem':164 'feed':66 'financ':63,219 'gas':71 'general':202 'general-purpos':201 'generat':79 'geocod':76 'given':132 'id':38 'infer':57 'infrastructur':74 'json-response' 'key':98 'land':161 'limit':101 'list':241 'lowpaymentfee' 'lowpaymentfee.com':30,46 'made':139 'maxamountrequir':117 'network':94 'no-api-key' 'page':162,172 'paid':6,19 'path':192 'pay-per-call API' 'payload':188 'payment':137 'payto':148 'paywal':43 'per':8,21,86 'per-cal':7,20 'per-call-pricing' 'platform':47,214 'post':153 'price':65,83 'probe':108 'prompt':179 'provid':31 'purpos':203 'quot':70 'rate':68,100 'rather':198 'receipt':2,15,36,197 'render':174 'request':87,154 'request/response':226 'resourc':37 'return':110,156,238 'richer':246 'schema':185,227 'scheme':144 'sentiment':58 'settl':88 'span':53 'specif':106,195 'specifi':147 'stub':244 'suggest':193 'suit':50 'summar':60 'technic':183 'thin':165 'token':69 'transact':1,14,35,196 'transaction receipt API' 'transaction-receipt' 'treat':239 'unclear':211 'unit':122 'usdc':13,26,90,124,133 'usdc-settlement' 'util':75,206,221 'valid':77,112 'via':10,23,140 'wallet':178 'web3':64 'x402':11,24,42,113,142 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"d07ea7a7-aa0e-4ace-bc78-b5c1f403ccd2","listingId":"cbeff944-c2f3-439b-b886-ff0440db0455","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/236/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":"2026-04-18T18:59:30.585Z"}],"sources":[{"listingId":"cbeff944-c2f3-439b-b886-ff0440db0455","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/236/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:30.585Z","lastSeenAt":"2026-04-24T16:03:18.361Z"}],"details":{"listingId":"cbeff944-c2f3-439b-b886-ff0440db0455","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/236/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 returned maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/236/receipt"},{"claim":"Platform advertises APIs for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for resource 236 via a single micropayment","Demonstrating x402 payment flow on the Base network","Programmatic access to paid data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases needing keyless, pay-per-call API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based access without crypto wallets","Bulk data retrieval where per-call micropayments are impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.021Z"},"updatedAt":"2026-04-24T16:03:18.361Z"}}