{"id":"eb6a99e1-ff20-4807-bda1-d3522fdff0e9","shortId":"MqnBqY","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 collection of pay-per-request 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.\n\nThe specific endpoint `/api/v1/claims/41` is listed as \"Premium API Access\" and returns a live x402 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 or rate limits required. The platform advertises instant access with no minimums or commitments.\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 description of what the `/api/v1/claims/41` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it unclear what data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key","no-rate-limits"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","crypto paid api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/claims/41 ('Premium API Access') has no description of what it returns or what input it expects","The broad catalog of 16+ endpoints listed on the homepage cannot be verified as functional from the probe data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/41","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page lists available endpoints with pricing. However, there is no OpenAPI schema, no request/response examples, no documentation beyond wallet-connect prompts, and the specific purpose of /api/v1/claims/41 is undocumented. This is effectively a stub 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'/api/v1/claims/41':106,197 '/docs':166 '/pricing':168 '/readme':170 '/request':17,34 '0.02':16,33,93,134 '000':123 '0x8335':128 '20':122 '2913':129 '402':206 'access':112,155 'across':52 'actual':199 'advertis':153 'ai':10,27,62 'ai-inference' 'analysi':66 'analyt':56 'api':4,21,40,111,145 'base':7,24,101,124,131 'base usdc api' 'captur':208 'categori':54 'challeng':118,207 'cheap api access' 'classif':69 'classification' 'collect':45 'commit':160 'confirm':204 'connect':176 'content':182 'convers':86 'crypto paid api' 'data':9,26,55,59,218 'data-analytics' 'descript':193 'document':161,213 'embed':70 'embeddings' 'endpoint':14,31,51,89,105,198,202 'equal':133 'estim':80 'exact':141 'exampl':190 'exchang':75 'export':60 'extrem':163 'feed':74 'financ':11,28,71 'finance-data' 'four':53 'function':220 'gas':79 'gate':3,20 'generat':87 'geocod':84 'geocoding' 'infrastructur':82 'insight':61 'instant':154 'key':146 'lack':211 'learn':64 'limit':149 'list':108 'live':116,205 'low payment fee' 'lowpaymentfee.com':35 'machin':63 'made':137 'make':214 'metric':57 'micropayment api' 'minimum':158 'network':102 'no-api-key' 'no-rate-limits' 'offer':8,25 'openapi':186 'page':171 'paid':96 'pay':48 'pay per call api' 'pay-per-request':47 'payment':135 'per':49,94 'platform':5,22,41,152 'premium':110 'price':73,91 'prompt':178 'protocol':39 'provid':43,224 'quot':78 'rate':76,148 'render':173 'report':58 'request':50,95,119 'request/response':189 'requir':150 'return':114,200 'rout':223 'schema':187 'scheme':142 'sentiment':65 'sentiment-analysis' 'spars':164 'specif':104,222 'summar':68 'text':67 'text-summarization' 'token':77 'unclear':216 'unit':125 'usdc':98,127 'usdc-base' 'util':13,30,83 'valid':85 'via':138 'wallet':177 'web3':72 'x402':2,19,38,117,140 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f8a29066-7cf0-42d9-8dd4-b47160d908fe","listingId":"eb6a99e1-ff20-4807-bda1-d3522fdff0e9","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:44.655Z"}],"sources":[{"listingId":"eb6a99e1-ff20-4807-bda1-d3522fdff0e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:44.655Z","lastSeenAt":"2026-04-23T06:31:03.350Z"}],"details":{"listingId":"eb6a99e1-ff20-4807-bda1-d3522fdff0e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/41 \\\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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, no minimums, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/41"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, asset is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC on Base)","source_url":"https://lowpaymentfee.com/api/v1/claims/41"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-request basis","Using utility services like geocoding, validation, and data conversion with instant crypto micropayments","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","Users who prefer crypto micropayments over subscription billing","Prototyping and low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, schemas, or SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.645Z"},"updatedAt":"2026-04-23T06:31:03.350Z"}}