{"id":"4644ed71-4b63-4df0-9159-5a7abc2a964e","shortId":"z6JWXm","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 a transaction receipt resource (transaction ID 208) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, 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/208/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the accepted payment scheme (exact), the USDC asset contract on Base (`0x8335…`), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nThe platform's landing page lists additional endpoints across analytics (metrics, reports, data export, insights), AI (sentiment analysis, text summarization, classification, embeddings), finance (price feeds, exchange rates, token quotes, gas estimates), and utilities (geocoding, validation, conversion, generation), all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","transaction-receipt","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","402 payment API","crypto micropayment API"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The specific resource (transaction 208 receipt) is unexplained; unclear what data it returns","No example request or response bodies are available anywhere in the crawl","The broader platform lists many endpoints but none have documented schemas or usage examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/208/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/208/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 with clear pricing, but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response payloads, and the specific purpose of 'transaction 208 receipt' is unexplained. Effectively a stub 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'0.02':71,127,191 '000':123 '0x8335':116 '20':122 '208':40 '402':102 '402 payment API' '6':131 'Base network API' 'USDC pay-per-call' 'accept':86,106 'access':141 'across':158 'addit':156 'advertis':53,140 'ai':60,165 'amount':120 'analysi':167 'analyt':59,159 'api':55,134,208 'application/json':91 'asset':112 'avail':205 'base':8,22,80,115,124 'behind':41 'broader':50 'call':12,26 'caller':99 'categori':56 'challeng':103 'classif':170 'connect':217 'contain':104 'content':223 'contract':113 'convers':185 'crypto micropayment API' 'data':58,162 'decim':132 'detail':198 'doc':207 'document':199 'embed':171 'endpoint':6,20,30,84,157 'estim':180 'exact':109 'exampl':201 'exchang':175 'export':163 'feed':174 'financ':63,172 'gas':179 'gate':3,17 'generat':186 'geocod':183 'given':128 'grant':143 'handl':94 'howev':194 'i.e':126 'id':39 'includ':57 'infrastructur':66 'insight':164 'json-response' 'key':135 'land':153 'learn':62 'limit':138 'list':155 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'maximum':119 'metric':160 'micropay':149 'multipl':54 'network':81 'openapi':196 'page':154,212 'paid':9,23 'part':47 'payload':203 'payment':92,107 'paywal':44 'per':11,25,72,147 'per-cal':10,24 'per-request':146 'per-request-micropayment' 'platform':51,151 'point':193 'post':87 'post-method' 'price':69,173,192,209 'prompt':219 'protocol':98 'provid':33 'pure':144 'quot':178 'rate':137,176 'readm':211 'receipt':5,19,36 'receiv':100 'render':214 'report':161 'request':73,88,148 'request/response':202 'resourc':37 'return':90 'schema':197 'scheme':108 'sentiment':166 'settl':75 'specif':83 'substant':222 'summar':169 'text':168 'token':177 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':125 'usdc':14,28,77,111,129 'usdc-base' 'util':67,182 'valid':184 'via':95 'wallet':218 'web3':64 'x402':2,16,43,97 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"acfe9004-1e3e-499a-8658-7a6598376ea3","listingId":"4644ed71-4b63-4df0-9159-5a7abc2a964e","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/208/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":"2026-04-18T18:59:22.860Z"}],"sources":[{"listingId":"4644ed71-4b63-4df0-9159-5a7abc2a964e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/208/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:22.860Z","lastSeenAt":"2026-04-24T17:03:04.761Z"}],"details":{"listingId":"4644ed71-4b63-4df0-9159-5a7abc2a964e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/208/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/208/receipt"},{"claim":"All endpoints 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 endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/208/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 208 via a single micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Agent-driven programmatic access to receipts without API key management"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that can settle USDC micropayments on Base","Use cases requiring keyless, per-request API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need bulk or subscription-based access at lower marginal cost","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.393Z"},"updatedAt":"2026-04-24T17:03:04.761Z"}}