{"id":"8c105a1f-f638-423b-ba5d-40312eabacb8","shortId":"x4NsfE","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/v1/transfers/6` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to the specified payTo address, with a 300-second timeout window.\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 (geocoding, validation, conversion, generation). All are priced identically at $0.02. Documentation pages exist but appear to require wallet connection and contain no visible content beyond that prompt, so detailed request/response schemas are unavailable.","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","no-api-key"],"categories":["ai","finance","data","infrastructure"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are entirely unknown for this endpoint","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no visible content","The specific function of /api/v1/transfers/6 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint","The platform lists many endpoint categories but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/6","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/transfers/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and all docs/pricing/README pages return only a 'Connect wallet' prompt with no usable content. The specific purpose of the /api/v1/transfers/6 endpoint beyond 'Premium API Access' is 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'/request':13,30 '0.02':12,29,78,124,192 '000':113 '0x8335':118 '20':112 '2913':119 '300':143 '6':128 'Base network API' 'USDC API' 'accept':101 'access':99 'across':152 'address':140 'advertis':107 'ai':162 'ai-inference' 'ai/ml':53 'amount':110 'analysi':166 'analyt':52,156 'api':5,15,22,32,41,83,98 'appear':197 'base':8,25,71,114,121 'beyond':207 'broad':46 'broader':148 'call':4,21,80 'categori':154 'chain':135 'challeng':106 'classif':169 'classification' 'connect':201 'contain':203 'content':206 'convers':185 'crypto-paid API' 'crypto-quotes' 'data':51,56,155,159 'data-analytics' 'decim':129 'detail':211 'document':193 'embed':170 'embeddings' 'enabl':40 'endpoint':49,61,92,151 'equal':123 'estim':180 'exchang':175 'exist':195 'export':160 'feed':174 'financ':171 'finance-data' 'finance/web3':55 'flat':75 'four':153 'gas':179 'generat':186 'geocod':183 'geocoding' 'given':125 'ident':190 'infer':54 'infrastructur':182 'insight':161 'key':16,33,84 'label':96 'learn':164 'limit':86 'list':150 'low fee API' 'lowpaymentfee.com':35 'machin':163 'max':109 'metric':157 'micropayment API' 'network':9,26,72 'no-api-key' 'offer':44 'on-chain':133 'page':194 'paid':63 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':130 'payto':139 'per':3,20,65,79 'per-request':64 'per-request-pricing' 'platform':6,23,42,149 'post':102 'premium':97 'price':173,189 'prompt':209 'quot':178 'rate':76,85,176 'report':158 'request':66,103 'request/response':212 'requir':17,34,89,199 'schema':213 'second':144 'sentiment':165 'sentiment-analysis' 'serverless API' 'servic':59 'set':47 'settl':132 'span':50 'specif':91 'specifi':138 'subscript':88 'summar':168 'text':167 'text-summarization' 'timeout':145 'token':177 'unavail':215 'unit':115 'usdc':68,117,126 'usdc-base-network' 'use':67 'util':58 'valid':184 'via':10,27 'visibl':205 'wallet':200 'web3':172 'window':146 'x402':11,28,39,105 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"ec5cea0b-6c2e-41db-ac89-3728790c249d","listingId":"8c105a1f-f638-423b-ba5d-40312eabacb8","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/transfers/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:53.570Z"}],"sources":[{"listingId":"8c105a1f-f638-423b-ba5d-40312eabacb8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:53.570Z","lastSeenAt":"2026-04-22T09:01:48.868Z"}],"details":{"listingId":"8c105a1f-f638-423b-ba5d-40312eabacb8","quickStartSnippet":"# Pay $0.02 in USDC on Base per call via x402\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/6 \\\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":"Flat 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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/6"},{"claim":"Endpoint categories include Data & Analytics, AI & ML, 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 prices, gas estimates, or exchange rates with per-call payment","Running data analytics or export jobs paid individually via USDC on Base","Geocoding or data validation as a utility service with no subscription commitment","Demonstrating or testing x402 payment protocol integrations"],"bestFor":["AI agents and bots that can pay per-call via x402/USDC on Base","Developers wanting zero-setup API access without registration or API keys","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.752Z"},"updatedAt":"2026-04-22T09:01:48.868Z"}}