{"id":"cc4dcd75-865d-4d60-a6ae-7bea39d2fb89","shortId":"ePP2GU","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/products/64` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe platform organizes its endpoints into 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 listed endpoints share the same $0.02/request pricing.\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 schema, no request/response examples, and no detailed description of what the `/api/v1/products/64` endpoint actually returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual payload format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific purpose and payload format of /api/v1/products/64 is undocumented","Cannot verify what data or functionality is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/64","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/products/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation beyond the landing page catalog. No OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The purpose of /api/v1/products/64 specifically is unclear beyond the generic label 'Premium API 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'/request':19,38,156 '0.02':18,37,87,155 '000':81 '20':80 '402 payment api' 'accept':208 'access':75 'actual':197,213 'advertis':97 'ai':12,31,123 'ai-inference' 'analysi':127 'analyt':117 'api':5,24,45,74,91,164 'attach':100 'base':8,27,63,82 'base network api' 'broad':50 'call':4,23,89 'caller':98 'catalog':51 'categori':115 'challeng':201 'charg':77 'classif':130 'classification' 'confirm':202 'connect':173 'content':179 'convers':147 'data':11,30,116,120 'data-analytics' 'descript':191 'detail':190 'doc':163 'document':158 'embed':131 'embeddings' 'enabl':44 'endpoint':16,35,57,67,112,151,196,204 'estim':141 'exampl':187 'exchang':136 'export':121 'extrem':160 'feed':135 'financ':13,32,132 'finance-data' 'format':215 'four':114 'gas':140 'generat':148 'geocod':145 'geocoding' 'header':104 'i.e':86 'infrastructur':143 'insight':122 'key':92 'learn':125 'limit':95 'list':71,150 'live':206 'low payment fee' 'lowpaymentfee.com':39 'machin':124 'metric':118 'micropayment api' 'network':64 'offer':10,29 'openapi':183 'organ':110 'page':168 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':214 'payment':103 'per':3,22,55,88 'platform':6,25,46,109 'post':209 'premium':73 'price':134,157,165 'prompt':175 'provid':48 'quot':139 'rate':94,137 'readm':167 'render':170 'report':119 'request':56,107,210 'request/response':186 'respons':217 'return':198 'schema':184 'sentiment':126 'sentiment-analysis' 'settl':58 'share':152 'simpli':99 'spars':161 'specif':66 'structur':218 'summar':129 'text':128 'text-summarization' 'token':138 'unit':83 'unknown':220 'usdc':9,28,60,85 'usdc api' 'usdc-base' 'util':15,34,144 'utility-apis' 'valid':146 'wallet':174 'web3':133 'x402':43,102,200 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"efdfb16a-5fd9-4a80-9645-4160f736c095","listingId":"cc4dcd75-865d-4d60-a6ae-7bea39d2fb89","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/products/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:23.321Z"}],"sources":[{"listingId":"cc4dcd75-865d-4d60-a6ae-7bea39d2fb89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:23.321Z","lastSeenAt":"2026-04-23T20:01:31.448Z"}],"details":{"listingId":"cc4dcd75-865d-4d60-a6ae-7bea39d2fb89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/64 \\\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":"The endpoint charges up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equivalent to $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/64"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto-settled payments"],"bestFor":["Agents or apps that need low-friction, keyless API access settled in USDC on Base","Developers prototyping with multiple API categories (AI, finance, data) under a single payment model","Micropayment use cases where $0.02 per request is cost-effective"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users who need non-crypto payment methods or fiat billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:52:00.136Z"},"updatedAt":"2026-04-23T20:01:31.448Z"}}