{"id":"dc20cc43-ee5e-448a-b1a6-f13feb19c88c","shortId":"Y4yYhH","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment to access any endpoint.\n\nThe specific endpoint at `/api/v1/charges/280` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The platform advertises categories including 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 (geocoding, validation, conversion, generation).\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The endpoint is confirmed live via a valid 402 challenge, but without documentation it is unclear what inputs this specific endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","serverless api","no-auth api"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific functionality of /api/v1/charges/280 ('Premium API Access') is not documented — it is unclear what it does or what inputs it expects","Cannot verify that the advertised AI, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/280","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/charges/280","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 via a valid 402 challenge, and the landing page provides a catalog overview with pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The specific purpose of /api/v1/charges/280 ('Premium API Access') is unclear beyond its 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'/request':13,30 '0.02':12,29,68,135,138 '000':130 '20':129 '402':124,223 'access':107,120 'across':54 'advertis':143 'ai':153 'ai-inference' 'ai/ml':57 'analysi':157 'analyt':56,147 'api':5,15,22,32,41,84,119,184 'attach':95 'base':8,25,76,131,140 'base network api' 'broad':46 'call':4,21 'caller':93 'catalog':47 'categori':144 'challeng':125,224 'classif':160 'classification' 'commit':90 'confirm':218 'connect':193 'content':199 'convers':176 'data':55,146,150 'data-analytics' 'detail':210 'doc':183 'document':178,211,227 'embed':161 'embeddings' 'enabl':40 'endpoint':53,64,109,112,214,216,235 'estim':171 'exampl':207 'exchang':166 'expect':236 'export':151 'extrem':180 'feed':165 'financ':162 'finance-data' 'finance/web3':59 'gas':170 'generat':177 'geocod':174 'geocoding' 'header':100 'i.e':137 'includ':145 'infer':58 'infrastructur':61,173 'input':232 'insight':152 'key':16,33,85 'learn':155 'limit':87 'list':116 'live':219 'low payment fee' 'lowpaymentfee.com':35 'machin':154 'metric':148 'micropayment api' 'network':9,26,77 'no-api-key' 'no-auth api' 'offer':44 'openapi':203 'page':188 'paid':71 'pay':2,19,50 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':49 'payment':81,99,105 'per':3,20,51,69 'platform':6,23,42,142 'premium':118 'price':66,164,185 'prompt':195 'protocol':82 'quot':169 'rate':86,167 'readm':187 'render':190 'report':149 'request':52,70,126 'request/response':206 'requir':17,34,92 'return':122,240 'schema':204 'sentiment':156 'sentiment-analysis' 'serverless api' 'simpli':94 'spars':181 'specif':111,234 'substant':198 'summar':159 'text':158 'text-summarization' 'token':168 'unclear':230 'unit':132 'upfront':89 'usdc':73,134,136 'usdc api access' 'usdc-base' 'use':78 'util':62 'utility-services' 'valid':103,175,222 'via':10,27,220 'wallet':194 'web3':163 'without':226 'x':98 'x-payment':97 'x402':11,28,39,80,104 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"e899c019-2d0e-4dee-bfe2-3b2db0cb8637","listingId":"dc20cc43-ee5e-448a-b1a6-f13feb19c88c","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/charges/280","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:59.274Z"}],"sources":[{"listingId":"dc20cc43-ee5e-448a-b1a6-f13feb19c88c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/280","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:59.274Z","lastSeenAt":"2026-04-22T16:31:15.676Z"}],"details":{"listingId":"dc20cc43-ee5e-448a-b1a6-f13feb19c88c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/280 \\\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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/280"}],"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 data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents and bots that need frictionless, keyless API access via crypto micropayments","Developers prototyping with multiple API categories without committing to subscriptions","x402-compatible clients on the Base network looking for low-cost per-call endpoints"],"notFor":["Users who need detailed API documentation, schemas, or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up and bulk pricing would be preferred","Users without USDC on Base or without x402-compatible payment infrastructure"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.825Z"},"updatedAt":"2026-04-22T16:31:15.676Z"}}