{"id":"60326c09-e47f-4c7b-9927-0d5977fba4a5","shortId":"UGmpPs","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with a uniform price of $0.02 per call. The x402 protocol eliminates the need for API keys or account registration — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/90` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. 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. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all appear to require wallet connection and returned no useful content during crawl.","No OpenAPI or schema documentation is available — request and response formats for this endpoint are unknown.","The endpoint path '/api/v1/payments/90' does not match any of the named endpoints listed on the homepage; its specific functionality is unclear.","The 'Premium API Access' description is generic and does not explain what data or service this endpoint provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/90","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/payments/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are gated behind wallet connection, no OpenAPI schema is available, and there are no request/response examples for this specific endpoint. The endpoint path '/api/v1/payments/90' is generic and its actual functionality beyond 'Premium API Access' is 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'/request':13,30 '0.02':12,29,76,131,185 '000':120 '0x8335':125 '20':119 '2913':126 '300':144 '402':114 '6':135 'accept':149 'access':110 'account':89 'across':49 'advertis':158 'ai-inference' 'ai/ml':52 'analysi':162 'analyt':51 'api':5,15,22,32,41,86,109 'appear':192 'application/json':154 'attach':93 'avail':209 'base':8,25,69,121,128 'base network api' 'broader':156 'call':4,21,78 'caller':91 'challeng':115 'classif':165 'classification' 'connect':197 'convers':177 'crawl':212 'crypto-quotes' 'data':50,179 'data-analytics' 'decim':136 'detail':201 'document':188 'elimin':82 'embed':166 'embeddings' 'enabl':40 'endpoint':48,59,102,148,159,206 'equal':130 'estim':174 'exact':141 'exchang':169 'exist':190 'feed':168 'finance-data' 'finance/web3':54 'gas':173 'generat':180 'geocod':175 'geocoding' 'given':132 'header':96 'individu':205 'infer':53 'infrastructur':56 'key':16,33,87 'list':106 'low payment fee' 'lowpaymentfee.com':35 'micropayment api' 'need':84 'network':70 'no-auth api' 'offer':44 'page':189 'paid':61 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'payment':95,138 'per':3,20,63,77 'per-request':62 'per-request-pricing' 'platform':6,23,42,157 'point':187 'post':150 'premium':108 'price':74,167,186 'protocol':81 'quot':172 'rate':170 'registr':90 'request':64,99,116,151 'request/response':202 'requir':17,34,194 'return':112,153 'schema':203 'scheme':139 'second':145 'sentiment':161 'sentiment-analysis' 'simpli':92 'specif':101 'summar':164 'text':163 'text-summarization' 'timeout':146 'token':171 'uniform':73 'unit':122 'usdc':9,26,66,124,133 'usdc api' 'usdc-base-network' 'use':65 'util':57 'utility-apis' 'valid':176 'varieti':46 'via':10,27 'view':199 'wallet':196 'x402':11,28,39,80 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"39f21b23-4326-46d4-ad59-968e680f808b","listingId":"60326c09-e47f-4c7b-9927-0d5977fba4a5","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/payments/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:51.976Z"}],"sources":[{"listingId":"60326c09-e47f-4c7b-9927-0d5977fba4a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:51.976Z","lastSeenAt":"2026-04-23T02:01:20.166Z"}],"details":{"listingId":"60326c09-e47f-4c7b-9927-0d5977fba4a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/90 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/90"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call payment","Geocoding or data validation as a utility service within automated workflows","Exporting analytics data or generating insights reports on demand","Programmatic access to exchange rates and price feeds for DeFi applications"],"bestFor":["AI agents and bots that can pay per-request via x402 on Base","Developers who want instant API access without signup or rate limits","Low-volume or bursty workloads where flat subscription pricing is wasteful"],"notFor":["High-volume production workloads where per-call costs add up quickly","Users without a Base-network USDC wallet or x402-compatible client","Anyone needing detailed API documentation before integrating (docs are sparse)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.806Z"},"updatedAt":"2026-04-23T02:01:20.166Z"}}