{"id":"a64fa1b3-7ca3-4c15-857c-da97af9f52d3","shortId":"K4GXty","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 gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/accounts/49` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals).\n\nThe broader platform advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The exact functionality of the `/api/v1/accounts/49` endpoint is unclear beyond its title \"Premium API Access,\" and it is not listed among the publicly advertised endpoints on the homepage.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no usable content.","No OpenAPI or schema available; request and response formats are unknown.","The endpoint /api/v1/accounts/49 is not listed among the publicly advertised APIs on the homepage — its specific functionality is unclear.","No request/response examples are available anywhere in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/49","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/accounts/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and documentation pages are empty. The specific endpoint /api/v1/accounts/49 is not listed on the homepage and its purpose is opaque beyond the generic 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'/request':17,34 '0.02':16,33,92,144 '000':86 '20':85 '402 payment api' '6':96 'accept':74 'access':44,72,211 'advertis':101,220 'ai':10,27,113 'ai-inference' 'among':217 'analysi':117 'analyt':107 'api':4,21,40,71,105,149,165,210 'avail':193 'base':7,24,60,87 'base network api' 'behind':50 'beyond':206 'broader':99 'categori':103 'challeng':81 'classif':120 'classification' 'commit':157 'connect':174 'content':180 'convers':137 'crawl':196 'data':9,26,106,110 'data-analytics' 'decim':97 'detail':191 'doc':164 'document':159,192 'embed':121 'embeddings' 'endpoint':14,31,49,64,140,203,221 'estim':131 'exact':198 'exampl':188 'exchang':126 'export':111 'extrem':161 'feed':125 'financ':11,28,122 'finance-data' 'four':102 'function':199 'gas':130 'gate':3,20,43 'generat':138 'geocod':135 'geocoding' 'given':93 'homepag':224 'i.e':91 'infrastructur':133 'insight':112 'key':150 'learn':115 'limit':153 'list':68,142,216 'low payment fee' 'lowpaymentfee.com':35 'machin':114 'metric':108 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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/v1/accounts/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:44.992Z"}],"sources":[{"listingId":"a64fa1b3-7ca3-4c15-857c-da97af9f52d3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:44.992Z","lastSeenAt":"2026-04-22T18:31:06.512Z"}],"details":{"listingId":"a64fa1b3-7ca3-4c15-857c-da97af9f52d3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/49 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/49"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"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 on a pay-per-call basis","Running data analytics queries and exporting data with no subscription commitment","Using utility services like geocoding, validation, and conversion via micropayments"],"bestFor":["Agents or developers who want zero-commitment, pay-per-use API access","Use cases requiring no API key registration or rate limit negotiation","Projects already operating on the Base network with USDC liquidity"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.081Z"},"updatedAt":"2026-04-22T18:31:06.512Z"}}