{"id":"c9b13596-2289-4d1e-ae52-55982bfd7d9d","shortId":"nK6JKe","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-enabled API marketplace that exposes 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/products/36` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. It is unclear what specific data or functionality the `/api/v1/products/36` endpoint returns, as the description is simply \"Premium API Access\" with no further detail.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","data analytics API","AI inference API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose and response format of /api/v1/products/36 ('Premium API Access') is undocumented","No example requests or responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/36","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/36","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 it works. However, documentation is essentially nonexistent beyond the landing page listing. There is no OpenAPI spec, no request/response schema, no example payloads, and no explanation of what 'Premium API Access' at /api/v1/products/36 actually returns. The listing is effectively a 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'/api/v1/products/36':111,217 '/docs':176 '/pricing':177 '/readme':180 '/request':17,34 '0.02':16,33,94,138 '000':127 '0x8335':132 '20':126 '2913':133 '402':121 'AI inference API' 'Base network API' 'USDC API' 'accept':161 'access':117,227 'across':50 'addit':191 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,116,149,226 'application/json':166 'avail':207 'base':7,24,101,128,135 'base-network' 'beyond':168 'broad':46 'call':92 'categori':52 'challeng':122 'classif':67 'classification' 'commit':157 'connect':186 'content':193 'convers':84 'data':9,26,53,57,213 'data analytics API' 'data-analytics' 'descript':222 'detail':231 'document':167,202 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,109,160,218 'equal':137 'estim':78 'exact':145 'exampl':205 'exchang':73 'export':58 'expos':44 'extrem':173 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'function':215 'gas':77 'gate':3,20 'generat':85 'geocod':82 'geocoding' 'http':162 'infrastructur':80 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'x402-payment'","prices":[{"id":"9e58f8e8-9374-45a2-8ef7-0a4a1f0f230e","listingId":"c9b13596-2289-4d1e-ae52-55982bfd7d9d","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:59.981Z"}],"sources":[{"listingId":"c9b13596-2289-4d1e-ae52-55982bfd7d9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:59.981Z","lastSeenAt":"2026-04-23T19:30:51.894Z"}],"details":{"listingId":"c9b13596-2289-4d1e-ae52-55982bfd7d9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/36 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/36"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/36"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting reports on a per-request payment basis","Geocoding and data validation as utility microservices"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Crypto-native workflows that can settle USDC on Base","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users who need detailed API documentation, request/response schemas, or sandbox environments before committing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.03Z"},"updatedAt":"2026-04-23T19:30:51.894Z"}}