{"id":"1b905d54-ac62-4131-a897-d88549c1c2e3","shortId":"pLfvcg","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 57) 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. No API keys or rate limits are advertised; access is instant upon payment.\n\nThe specific endpoint `/api/v1/transactions/57/receipt` accepts POST requests and returns `application/json`. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment scheme is \"exact\" with a 300-second timeout. No OpenAPI spec, detailed documentation, or example responses were found in the crawl — the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. The actual data returned by this receipt endpoint is unknown beyond its JSON MIME type.","tags":[],"capabilities":["x402-payment","usdc-base","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","crypto payment gateway"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically.","Docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no usable content.","The specific resource (transaction 57 receipt) is opaque — no description of what fields or data the receipt contains.","The broader platform advertises many endpoints but none were individually verified beyond this one."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/57/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/57/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 documentation beyond a wallet-connect prompt, no example request/response payloads, and the actual data returned by this specific receipt endpoint is entirely undocumented. The listing is effectively a stub with confirmed 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'0.02':90,144 '000':139 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '20':138 '300':164 '57':40 '6':149 'Base network API' 'USDC micropayment API' 'accept':121 'access':112 'actual':198 'address':153 'advertis':49,111 'ai/ml':61 'analysi':64 'analyt':60 'api':57,105,184 'application/json':126 'base':8,22,98,140,156 'behind':41 'beyond':207 'broader':46 'call':12,26 'challeng':129 'classif':66 'confirm':130 'connect':190 'content':196 'convers':83 'crawl':179 'crypto payment gateway' 'data':59,69,199 'decim':150 'detail':170 'doc':181 'document':171 'embed':67 'endpoint':6,20,30,86,119,204 'estim':77 'exact':161 'exampl':173 'exchang':72 'feed':71 'finance/web3':68 'found':176 'gas':76 'gate':3,17 'generat':84 'geocod':81 'id':39 'infer':62 'infrastructur':79 'instant':114 'json':209 'json-response' 'key':106 'limit':109 'live':133 'lowpaymentfee' 'lowpaymentfee.com':32,47 'maximum':136 'mime':210 'network':99 'no-api-key' 'openapi':168 'page':185 'paid':9,23,151 'pay':54 'pay-per-call API' 'pay-per-request':53 'payment':116,158 'paywal':44 'per':11,25,55,91 'per-cal':10,24 'platform':48 'post':122 'price':70,88,182 'prompt':192 'protocol':103 'provid':33 'quot':75 'rate':73,108 'receipt':5,19,36,203 'request':56,92,123,134 'resourc':37 'respons':174 'return':125,187,200 'scheme':159 'second':165 'sentiment':63 'settl':93 'sinc':146 'span':58 'spec':169 'specif':118 'suit':51 'summar':65 'timeout':166 'token':74 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'type':211 'unit':141 'unknown':206 'upon':115 'usd':145 'usdc':14,28,95,143,147 'usdc-base' 'use':148 'util':80 'valid':82 'via':100 'wallet':191 'x402':2,16,43,102,128 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"138864c5-77aa-41ec-90fd-5efcf7dd85f3","listingId":"1b905d54-ac62-4131-a897-d88549c1c2e3","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/57/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":"2026-04-18T19:27:02.184Z"}],"sources":[{"listingId":"1b905d54-ac62-4131-a897-d88549c1c2e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/57/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:02.184Z","lastSeenAt":"2026-04-24T01:32:49.604Z"}],"details":{"listingId":"1b905d54-ac62-4131-a897-d88549c1c2e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/57/receipt\n# Returns 402 with x402 challenge. Attach X-PAYMENT header with valid USDC payment proof on Base to receive 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 x402 challenge requesting 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/57/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/57/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 57 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Agent-driven programmatic access to paid data without API key management"],"bestFor":["Developers experimenting with x402 protocol payments on Base","Agents that need keyless, pay-per-call API access settled in USDC","Projects requiring on-chain proof-of-payment for API consumption"],"notFor":["Users needing free or subscription-based API access","Applications requiring detailed API documentation or OpenAPI specs before integration","High-volume batch retrieval where per-call pricing is impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.2Z"},"updatedAt":"2026-04-24T01:32:49.604Z"}}