{"id":"cef79018-d97e-4f39-a7c3-5d8200ecd8ea","shortId":"zPyEqD","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/products/87` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and has a payment timeout of 300 seconds.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely thin; the docs, API, pricing, and README pages all appear to require a wallet connection and contain no visible content. No OpenAPI schema, request/response examples, or detailed parameter documentation were found.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","no-auth API"],"warnings":["No OpenAPI or schema documentation available — request parameters and response format are unknown","All doc/pricing/README pages require wallet connection and show no readable content","The specific purpose of /api/v1/products/87 ('Premium API Access') is not explained anywhere","No request or response examples could be found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/87","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt with no content. The purpose of this specific /products/87 endpoint is unclear beyond the generic 'Premium API Access' 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'/call':12,30 '0.02':11,29,65,133,182 '000':122 '0x8335':127 '20':121 '2913':128 '300':150 '6':137 'Base network API' 'USDC micropayment API' 'accept':141 'access':109 'account':85 'advertis':116,155 'ai-inference' 'ai/ml':55 'amount':119 'analysi':159 'analyt':54 'api':5,16,23,34,43,82,108,196 'appear':202 'application/json':112 'attach':92 'base':8,26,73,123,130 'beyond':187 'broad':48 'broader':153 'caller':90 'catalog':49 'challeng':115 'classif':162 'connect':207 'contain':209 'content':212 'convers':174 'cost':64 'crypto-paid API' 'data':53,58,176 'data-analytics' 'decim':138 'detail':219 'doc':195 'document':186,221 'embed':163 'enabl':42 'endpoint':51,63,101,140,156 'equal':132 'estim':171 'everi':62 'exampl':217 'exchang':166 'extrem':192 'feed':165 'finance-data' 'finance/web3':57 'found':223 'gas':170 'generat':177 'geocod':172 'given':134 'header':95 'howev':185 'infer':56 'json-response' 'key':17,35,83 'land':189 'limit':89 'list':105 'lowpaymentfee' 'lowpaymentfee.com':37 'max':118 'mean':78 'network':74 'no-api-key' 'no-auth API' 'offer':46 'openapi':214 'page':190,200 'paid':68 'paramet':220 'pay':2,20 'pay-per-call API' 'pay-per-request':1,19 'payment':94,147 'per':3,21,66 'platform':6,24,44,154 'point':184 'post':142 'premium':107 'price':164,183,197 'protocol':77 'quot':169 'rate':88,167 'readm':199 'request':4,22,67,98,143 'request/response':216 'requir':18,36,204 'return':111 'schema':215 'second':151 'sentiment':158 'servic':61 'simpli':91 'span':52 'specif':100 'summar':161 'text':160 'thin':193 'timeout':148 'token':168 'unit':124 'usdc':14,32,70,126,135 'usdc-base' 'util':60 'utility-services' 'valid':173 'via':9,27 'visibl':211 'wallet':206 'web3-data' 'x402':10,28,41,76,114 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"f524c8f8-9cbb-4257-ae6d-8a7d622b1368","listingId":"cef79018-d97e-4f39-a7c3-5d8200ecd8ea","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:49.775Z"}],"sources":[{"listingId":"cef79018-d97e-4f39-a7c3-5d8200ecd8ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:49.775Z","lastSeenAt":"2026-04-23T20:01:33.331Z"}],"details":{"listingId":"cef79018-d97e-4f39-a7c3-5d8200ecd8ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/87 \\\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 platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/87"},{"claim":"The platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Fetching financial data, exchange rates, or gas estimates with per-call USDC payments","Running AI inference tasks (sentiment, summarization, classification, embeddings) via simple HTTP POST","Geocoding or data conversion utilities paid per request"],"bestFor":["AI agents and bots that can settle x402 payments on Base","Developers who want zero-signup, pay-as-you-go API access","Low-volume or sporadic API consumers who don't want monthly commitments"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users without a Base-compatible USDC wallet","Anyone needing detailed API documentation or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:34:48.993Z"},"updatedAt":"2026-04-23T20:01:33.331Z"}}