{"id":"5bd498a6-9f2d-4ff5-a73e-07dbc4fccb0f","shortId":"uqBrRN","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text 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, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/trades/23` is listed as \"Premium API Access\" and was probed live, returning a valid 402 challenge. The challenge specifies an exact-scheme payment of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nNote that while the landing page lists many endpoints, the `/api/v1/trades/23` path does not appear among them and its specific functionality (\"Premium API Access\") is not documented beyond the title. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional documentation. The actual data returned by this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key","no-rate-limit"],"categories":["finance","data","api-platform"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","trades API"],"warnings":["The /api/v1/trades/23 endpoint is not listed on the provider's landing page among its advertised APIs — its purpose is unclear.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The endpoint name 'Premium API Access' is generic and does not describe the data or service provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/23","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/trades/23","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for the /api/v1/trades/23 endpoint specifically, no request/response schema, no examples, and the docs pages are empty. The endpoint's actual functionality is unknown beyond the generic 'Premium API Access' 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'/request':17,34 '0.02':16,33,91,156 '000':144 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '0x8335':150 '20':143 '2913':151 '300':170 '402':132 '6':160 'Base network API' 'USDC API' 'accept':175 'access':124,204 'across':50 'actual':230 'addit':227 'address':166 'ai':10,27,60 'among':196 'analysi':64 'analyt':54 'api':4,21,41,106,123,203,214 'appear':195 'application/json':180 'base':7,24,99,145,153 'beyond':208 'broad':46 'catalog':47 'categori':52 'challeng':133,135 'classif':67 'commit':114 'connect':222 'contract':149 'convers':84 'data':9,26,53,57,231 'decim':161 'doc':212 'document':207,228 'embed':68 'enabl':40 'endpoint':14,31,49,87,117,174,189,235 'equal':155 'estim':78 'exact':139 'exact-schem':138 'exchang':73 'export':58 'expos':44 'feed':72 'financ':11,28,69 'four':51 'function':201 'gas':77 'generat':85 'geocod':82 'given':157 'infrastructur':80 'insight':59 'json-response' 'key':107 'land':185 'learn':62 'limit':110 'list':120,187 'live':128 'low payment fee' 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'x402-payment'","prices":[{"id":"192b276a-c007-4fb3-b119-e08c42952772","listingId":"5bd498a6-9f2d-4ff5-a73e-07dbc4fccb0f","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/trades/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:48.543Z"}],"sources":[{"listingId":"5bd498a6-9f2d-4ff5-a73e-07dbc4fccb0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:48.543Z","lastSeenAt":"2026-04-23T23:32:43.951Z"}],"details":{"listingId":"5bd498a6-9f2d-4ff5-a73e-07dbc4fccb0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/trades/23"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or premium content via a single micropayment","Integrating pay-per-request APIs into agent workflows without managing API keys","Programmatic access to financial or analytics data with crypto-native billing"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who need bulk/subscription pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.796Z"},"updatedAt":"2026-04-23T23:32:43.951Z"}}