{"id":"9d966674-3dfd-4e29-9fbf-77097da4173b","shortId":"rcGYVV","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API platform that provides a collection of pay-per-request 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.\n\nThe specific endpoint at `/api/v1/trades/48` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335...0913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys or rate limits required. The endpoint accepts POST requests and returns application/json responses.\n\nNote that while the landing page advertises a broad suite of endpoints, the crawled documentation pages (docs, api, pricing, README) all returned minimal content (just \"Connect wallet\"), so detailed request/response schemas, parameter documentation, and example payloads are not available. The actual functionality behind `/api/v1/trades/48` is unclear — the name suggests trade data but no further specifics are documented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","price-feeds","gas-estimates","geocoding","no-api-key"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return minimal content with no usable information","No OpenAPI or request/response schema available for any endpoint","The specific endpoint /api/v1/trades/48 is not listed on the landing page's API catalog — its purpose is unclear","No examples of request parameters or response payloads are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/48","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the docs/pricing/README pages are all empty. The specific purpose of /api/v1/trades/48 is undocumented beyond the generic label 'Premium API 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'/request':17,34 '0.02':16,33,93,134 '000':123 '0913':129 '0x8335':128 '20':122 '402':117 '402 payment api' 'accept':153 'access':113 'across':52 'actual':200 'advertis':166 'ai':10,27,62 'ai-inference' 'analysi':66 'analyt':56 'api':4,21,40,112,145,177 'application/json':158 'avail':198 'base':7,24,101,124,131 'base usdc api' 'behind':202 'broad':168 'categori':54 'challeng':118 'cheap api access' 'classif':69 'classification' 'collect':45 'connect':185 'content':183 'convers':86 'crawl':173 'data':9,26,55,59,210 'data-analytics' 'detail':188 'doc':176 'document':174,192,216 'embed':70 'embeddings' 'endpoint':14,31,51,89,105,152,171 'equal':133 'estim':80 'exact':141 'exampl':194 'exchang':75 'export':60 'feed':74 'financ':11,28,71 'finance-data' 'four':53 'function':201 'gas':79 'gas-estimates' 'gate':3,20 'generat':87 'geocod':84 'geocoding' 'infrastructur':82 'insight':61 'key':146 'land':164 'learn':64 'limit':149 'list':109 'low payment fee' 'lowpaymentfee.com':35 'machin':63 'made':137 'metric':57 'micropayment api' 'minim':182 'name':207 'network':102 'no-api-key' 'note':160 'offer':8,25 'page':165,175 'paid':96 'paramet':191 'pay':48 'pay per call api' 'pay-per-request':47 'payload':195 'payment':135 'per':49,94 'platform':5,22,41 'post':154 'premium':111 'price':73,91,178 'price-feeds' 'protocol':39 'provid':43 'quot':78 'rate':76,148 'readm':179 'report':58 'request':50,95,119,155 'request/response':189 'requir':150 'respons':159 'return':115,157,181 'schema':190 'scheme':142 'sentiment':65 'sentiment-analysis' 'specif':104,214 'suggest':208 'suit':169 'summar':68 'text':67 'text-summarization' 'token':77 'trade':209 'unclear':205 'unit':125 'usdc':98,127 'usdc-base' 'util':13,30,83 'valid':85 'via':138 'wallet':186 'web3':72 'x402':2,19,38,140 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"7f1ed5e9-236e-4443-9e37-5e5c095827f1","listingId":"9d966674-3dfd-4e29-9fbf-77097da4173b","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:04.603Z"}],"sources":[{"listingId":"9d966674-3dfd-4e29-9fbf-77097da4173b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:04.603Z","lastSeenAt":"2026-04-23T06:31:32.882Z"}],"details":{"listingId":"9d966674-3dfd-4e29-9fbf-77097da4173b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/trades/48 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/48"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running AI inference tasks (sentiment analysis, summarization, classification) without subscription commitments","Exporting data or generating analytics reports on demand","Geocoding addresses or validating/converting data via utility endpoints"],"bestFor":["Developers wanting no-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads that benefit from bulk pricing or SLAs","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.034Z"},"updatedAt":"2026-04-23T06:31:32.882Z"}}