{"id":"6d4fc877-aec9-4e7f-a463-c1b70dc2cd27","shortId":"zkzcVV","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/resource/25` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts POST requests and returns `application/json`.\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 sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","USDC API","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The purpose of /api/resource/25 is unclear; 'Premium API Access' is a generic label with no functional description.","No OpenAPI schema or request/response examples are provided anywhere.","No information on what data or service this specific endpoint actually delivers."],"endpointUrl":"https://lowpaymentfee.com/api/resource/25","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/resource/25","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 with clear pricing. However, documentation is essentially nonexistent beyond the landing page — no OpenAPI spec, no request/response examples, no explanation of what /api/resource/25 actually returns. The generic 'Premium API Access' label provides no specificity about the endpoint's 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'/request':13,29 '0.02':12,28,63,120,179 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '20':114 '402':109 '6':125 'Base network API' 'USDC API' 'accept':143 'access':105 'across':47 'address':134 'advertis':152 'ai':50 'analysi':156 'analyt':49 'api':5,21,39,77,104,193 'application/json':148 'attach':88 'base':8,24,71,116,128 'beyond':184 'broader':150 'call':4,20 'caller':86 'categori':57 'challeng':110 'classif':159 'commit':85 'connect':202 'convers':171 'data':48,173 'decim':126 'detail':209,216 'doc':192 'document':183,218 'embed':160 'enabl':38 'endpoint':46,59,98,142,153,217 'estim':168 'exact':138 'exampl':214 'exchang':163 'extrem':189 'feed':162 'financ':53 'found':220 'gas':167 'generat':174 'geocod':169 'header':92 'howev':182 'infrastructure/utility':56 'json-response' 'key':15,31,78 'label':102 'land':186 'learn':52 'limit':81 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':51 'made':132 'micropayment API' 'network':72 'no-api-key' 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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/resource/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:18.862Z"}],"sources":[{"listingId":"6d4fc877-aec9-4e7f-a463-c1b70dc2cd27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:18.862Z","lastSeenAt":"2026-04-22T12:03:16.836Z"}],"details":{"listingId":"6d4fc877-aec9-4e7f-a463-c1b70dc2cd27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/25 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/resource/25"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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":["Programmatic access to utility APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled via crypto micropayments","Testing x402 payment flows against a live endpoint on Base"],"bestFor":["Developers wanting zero-friction, keyless API access via x402","AI agents that can autonomously pay per request using USDC on Base","Prototyping x402 payment integrations at low cost ($0.02/call)"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-request crypto settlement adds latency","Teams that require traditional authentication, SLAs, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.276Z"},"updatedAt":"2026-04-22T12:03:16.836Z"}}