{"id":"f686f80b-283e-4ce6-9e4f-a19f0d8356d7","shortId":"XCvzpf","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/66` is listed as \"Premium API Access\" and carries a max amount of 20,000 base units of USDC (0.02 USDC, i.e., $0.02 per call). 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). However, the crawled documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified.\n\nThe endpoint is confirmed live — it returns a proper 402 challenge with x402 version 1, accepting the \"exact\" payment scheme on Base with USDC (contract 0x8335…2913). The payment recipient is 0x1A2B…85F3 with a 300-second timeout. Without detailed documentation or example responses, the precise functionality behind the \"Premium API Access\" label for this particular transfer endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API","serverless API access"],"warnings":["Documentation pages (/docs, /pricing, /README) returned no useful content — only 'Connect wallet' prompts.","The specific functionality of /api/v1/transfers/66 ('Premium API Access') is not documented; its purpose is unclear.","No OpenAPI spec or response schema is available for any endpoint.","The broad range of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified from crawl data alone."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/66","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC per call on Base). However, documentation pages are empty (only 'Connect wallet'), there is no OpenAPI schema, no example requests or responses, and the specific purpose of '/api/v1/transfers/66' is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,62,113,116 '000':108 '0x1a2b':218 '0x8335':212 '1':201 '20':107 '2913':213 '300':222 '402':196 '85f3':219 'Base network API' 'USDC API' 'accept':202 'access':100,238 'account':74 'across':45 'actual':177 'advertis':121 'ai':131 'ai-inference' 'ai/ml':48 'amount':105 'analysi':135 'analyt':47,125 'api':5,20,37,72,99,237 'attach':82 'base':8,23,69,109,208 'base-network' 'behavior':178 'behind':234 'call':4,19,118 'caller':80 'carri':102 'categori':122 'challeng':197 'classif':138 'classification' 'confirm':190 'connect':168 'content':174 'contract':211 'convers':154 'crawl':158 'crypto-paid API' 'data':46,124,128 'data-analytics' 'detail':226 'doc':161 'document':159,227 'embed':139 'embeddings' 'enabl':36 'endpoint':44,55,92,184,188,244 'estim':149 'exact':204 'exampl':229 'exchang':144 'export':129 'feed':143 'financ':140 'finance-data' 'finance/web3':50 'function':233 'gas':148 'generat':155 'geocod':152 'geocoding' 'header':86 'howev':156 'i.e':115 'includ':123 'infer':49 'infrastructur':52,151 'insight':130 'key':73 'label':239 'learn':133 'limit':77 'list':96 'live':191 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':132 'max':104 'metric':126 'micropayment API' 'network':9,24,70 'no-api-key' 'offer':40 'page':160 'particular':242 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,205,215 'per':3,18,59,117 'platform':6,21,38,120 'precis':232 'premium':98,236 'price':142,162 'prompt':170 'proper':195 'quot':147 'rate':76,145 'readm':163 'recipi':216 'remain':185 'report':127 'request':60,89 'requir':79 'respons':180,230 'return':165,193 'schema':181 'scheme':206 'second':223 'sentiment':134 'sentiment-analysis' 'serverless API access' 'settl':64 'simpli':81 'specif':91 'substant':173 'summar':137 'text':136 'text-summarization' 'timeout':224 'token':146 'transfer':243 'unclear':246 'unit':110 'unverifi':186 'usdc':15,30,66,112,114,210 'usdc-settlement' 'util':53 'utility-services' 'valid':153 'varieti':42 'version':200 'via':10,25 'wallet':169 'web3':141 'without':225 'x402':11,26,35,84,199 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"349e5ea2-1b18-4c7d-9e21-9c644df6b3e6","listingId":"f686f80b-283e-4ce6-9e4f-a19f0d8356d7","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:02.068Z"}],"sources":[{"listingId":"f686f80b-283e-4ce6-9e4f-a19f0d8356d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:02.068Z","lastSeenAt":"2026-04-22T15:02:26.001Z"}],"details":{"listingId":"f686f80b-283e-4ce6-9e4f-a19f0d8356d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/66 \\\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":"The 402 challenge specifies maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base network with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/transfers/66"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/66"},{"claim":"Platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates on a per-call basis","Running geocoding or data validation utilities with instant crypto-settled payments","Exporting analytics data or generating reports without subscription commitments"],"bestFor":["Developers who want zero-friction, keyless API access paid in USDC","Agents and bots that can attach x402 payment headers automatically","Users who need occasional API calls without committing to a subscription"],"notFor":["High-volume production workloads where per-call pricing may add up","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.384Z"},"updatedAt":"2026-04-22T15:02:26.001Z"}}