{"id":"82879bff-3751-4a97-9765-c82dec5e2b51","shortId":"x8GxuW","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints settled in USDC on the Base network. The specific endpoint at `/api/resource/1` is described as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader platform lists 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 are priced at $0.02 per request.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live (returns a valid 402 x402 challenge), but without documentation it is unclear what request body `/api/resource/1` expects or what it returns. The outputSchema in the challenge only indicates it accepts HTTP POST requests.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet'","No OpenAPI or schema specification provided for any endpoint","The specific endpoint /api/resource/1 is not listed among the advertised API routes on the homepage; its purpose is unclear","Request and response formats are entirely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/resource/1","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/1","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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what /api/resource/1 actually does beyond the generic label 'Premium API Access'. Pricing is clear but functionality is 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'/api/resource/1':58,207 '/docs':157 '/pricing':159 '/readme':161 '/request':18,36 '0.02':17,35,69,85,149 '000':75 '20':74 '402':195 '6':82 'accept':221 'access':64 'across':109 'advertis':93 'ai':12,30,119 'ai-inference' 'analysi':123 'analyt':11,29,113 'api':5,23,45,63,87 'attach':96 'avail':187 'base':8,26,52,76 'base network api' 'base-network' 'bodi':206 'broader':105 'call':4,22 'caller':94 'categori':111 'challeng':197,217 'classif':126 'classification' 'collect':40 'connect':167 'content':173 'convers':143 'cost':66 'cover':10,28 'crypto api access' 'data':112,116 'data-analytics' 'decim':83 'describ':60 'document':152,182,200 'embed':127 'embeddings' 'enabl':44 'endpoint':46,56,108,189 'equal':84 'estim':137 'exampl':185 'exchang':132 'expect':208 'export':117 'extrem':154 'feed':131 'financ':13,31,128 'finance-data' 'four':110 'gas':136 'generat':144 'geocod':141 'geocoding' 'header':100 'http':222 'indic':219 'infrastructur':139 'insight':118 'key':88 'learn':121 'limit':91 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'x402-payment'","prices":[{"id":"aa0c92d0-6fb1-44ed-991b-c4460636a20c","listingId":"82879bff-3751-4a97-9765-c82dec5e2b51","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/resource/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:36.666Z"}],"sources":[{"listingId":"82879bff-3751-4a97-9765-c82dec5e2b51","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:36.666Z","lastSeenAt":"2026-04-22T21:30:32.836Z"}],"details":{"listingId":"82879bff-3751-4a97-9765-c82dec5e2b51","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/1 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/resource/1"},{"claim":"All listed 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 lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/resource/1"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running analytics queries and data exports with per-request USDC micropayments","Geocoding, validation, and data conversion via utility endpoints"],"bestFor":["Agents or applications that need keyless, pay-per-use API access settled on-chain","Developers wanting low-friction access to multiple API categories without subscriptions","Crypto-native workflows that can attach x402 payment headers natively"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Applications that cannot handle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.455Z"},"updatedAt":"2026-04-22T21:30:32.836Z"}}