{"id":"339612b1-d09f-42fc-92aa-90dc01fc64fc","shortId":"unJYUz","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 broad set 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 payment protocol.\n\nThe specific endpoint `/api/v1/claims/90` is listed as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the \"Premium API Access\" endpoint at `/api/v1/claims/90` actually returns. The endpoint's purpose is unclear — it does not map to any of the named API categories on the landing page. Prospective users should be aware that the actual functionality behind this specific endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto-paid API","on-chain API access"],"warnings":["The endpoint path /api/v1/claims/90 does not match any of the documented API routes on the landing page; its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","No examples of actual request or response payloads exist in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/90","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/claims/90","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 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific endpoint '/api/v1/claims/90' does not correspond to any named API on the landing page, making its actual functionality 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'/api/v1/claims/90':109,217 '/docs':180 '/pricing':182 '/readme':184 '/request':17,34 '0.02':16,33,91,137 '000':126 '0x8335':131 '20':125 '2913':132 '402':120 '6':141 'Base network API' 'USDC micropayment API' 'access':115,214 'across':50 'actual':218,248 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,114,153,213,235 'attach':164 'awar':245 'base':7,24,99,127,134 'behind':250 'broad':46 'caller':162 'categori':52,236 'challeng':121 'classif':67 'classification' 'connect':190 'content':196 'convers':84 'crawl':179 'crypto-paid API' 'data':9,26,53,57 'data-analytics' 'decim':142 'document':174,205 'embed':68 'embeddings' 'endpoint':14,31,49,87,108,215,221,253 'equal':136 'estim':78 'exact':149 'exampl':208 'exchang':73 'export':58 'extrem':176 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'function':249 'gas':77 'gate':3,20 'generat':85 'geocod':82 'geocoding' 'given':138 'header':169 'infrastructur':80 'insight':59 'key':154 'land':239 'learn':62 'limit':157 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'x402-protocol':38","prices":[{"id":"30104147-8d9c-4363-8b1c-38f0a0e8844a","listingId":"339612b1-d09f-42fc-92aa-90dc01fc64fc","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/claims/90","description":"Premium API 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landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/claims/90 requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/claims/90"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-request payment basis","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["AI agents needing keyless, pay-per-call API access on Base","Developers who want to avoid subscription commitments for occasional API usage","Web3-native applications that can settle micropayments in USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.846Z"},"updatedAt":"2026-04-23T05:01:11.889Z"}}