{"id":"c2fc280c-e948-415b-8035-c5cf8a685025","shortId":"rpUFuw","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 385) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request 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 endpoint probed (/api/v1/transactions/385/receipt) returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the platform's advertised pricing. The payment scheme is \"exact\" and the payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 appears functional but under-documented, making it difficult to know what data the receipt endpoint returns without paying for a call.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No request or response schema documented; unknown what fields the receipt contains","This endpoint is for a specific transaction ID (385); unclear if other transaction IDs are available or how to discover them","No OpenAPI or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/385/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/385/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 documented request/response schema, no examples, and the docs pages are empty. The specific purpose of this receipt endpoint is unclear beyond its URL path. This is effectively a stub 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'/api/v1/transactions/385/receipt':118 '/docs':180 '/pricing':182 '/readme':184 '0.02':93,146 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':166 '0x8335':134 '20':128 '2913':135 '385':42 '6':141 'Base network API' 'USDC micropayment API' 'accept':169 'access':34 'actual':214 'address':164 'advertis':51,154 'ai':63 'analysi':67 'analyt':62 'api':59,105 'appear':218 'application/json':174 'base':8,22,101,130,137 'base-network' 'behind':43 'broader':48 'call':12,26,148,239 'challeng':123 'classif':69 'commit':112 'connect':190 'consist':149 'contain':215 'content':196 'convers':86 'crypto payment API' 'data':61,230 'decim':142 'difficult':226 'document':175,205,223 'embed':70 'endpoint':6,20,30,89,116,168,233 'estim':80 'exact':160 'exampl':208 'exchang':75 'extrem':177 'feed':74 'financ':71 'function':219 'gas':79 'gate':3,17 'generat':87 'geocod':84 'id':41 'infrastructur':82 'json-response' 'key':106 'know':228 'learn':65 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':32,49 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'x402-payment'","prices":[{"id":"082c0ebf-48eb-40e0-916e-4d55acfe5fc8","listingId":"c2fc280c-e948-415b-8035-c5cf8a685025","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/385/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":"2026-04-18T19:26:32.552Z"}],"sources":[{"listingId":"c2fc280c-e948-415b-8035-c5cf8a685025","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/385/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:32.552Z","lastSeenAt":"2026-04-24T06:32:43.070Z"}],"details":{"listingId":"c2fc280c-e948-415b-8035-c5cf8a685025","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/385/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02 per request pricing 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/385/receipt"},{"claim":"Platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipt data for transaction ID 385 via a single paid API call","Programmatic access to receipt information without traditional API key registration","Agent-driven workflows that need to fetch financial transaction records on-demand"],"bestFor":["Agents or services that need on-demand transaction receipt retrieval with crypto-native payment","Developers exploring x402 protocol integrations on Base","Use cases where avoiding API key management is preferred"],"notFor":["Bulk retrieval of many transaction receipts (each call costs $0.02 with no batch endpoint documented)","Users who need detailed API documentation or response schema guarantees before integrating","Non-crypto-native applications that cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.644Z"},"updatedAt":"2026-04-24T06:32:43.070Z"}}