{"id":"30e2556e-ae43-499c-be26-1fae21fa5d5a","shortId":"aLMvva","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/144` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (0.02 USD given 6 decimals) per call on the Base network. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\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. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so request/response schemas for any of these endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits","post-endpoint"],"categories":["infrastructure","general-purpose"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","402 payment api"],"warnings":["The exact functionality of /api/v1/transfers/144 ('Premium API Access') is undocumented — the name is generic and reveals nothing about what data or service it provides.","All documentation pages (docs, pricing, README) returned only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, request schema, or response schema is available for any endpoint on this platform.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/144","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /transfers/144 endpoint is entirely undocumented. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,62,131,184 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '20':125 '300':151 '402 payment api' '6':134 'accept':118 'access':100 'account':74 'across':45 'address':147 'advertis':157 'ai/ml':48 'analysi':161 'analyt':47 'api':5,20,37,72,99 'attach':82 'base':8,23,69,127,140 'base network api' 'beyond':108 'broader':155 'call':4,19,137 'caller':80 'challeng':113 'classif':164 'confirm':114 'connect':196 'convers':176 'data':46,178 'decim':135 'detail':203 'direct':145 'doc':190 'document':107,188 'embed':165 'enabl':36 'endpoint':44,55,92,158,211 'estim':173 'exact':103 'exchang':168 'feed':167 'finance/web3':50 'function':104 'gas':172 'generat':179 'geocod':174 'given':133 'header':86 'howev':187 'infer':49 'infrastructur':52 'key':73 'label':110 'limit':77 'list':96 'live':117 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,70,141 'no-api-key' 'no-rate-limits' 'offer':40 'page':189 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,143 'per':3,18,59,136 'platform':6,21,38,156 'point':186 'post':119 'post-endpoint' 'premium':98 'price':166,185,191 'prompt':198 'quot':171 'rate':76,169 'readm':192 'request':60,89,120 'request/response':205 'requir':79,122 'return':193 'schema':206 'second':152 'sentiment':160 'settl':64 'simpli':81 'specif':91 'summar':163 'technic':202 'text':162 'timeout':153 'token':170 'unit':128 'unknown':213 'usd':132 'usdc':15,30,66,130 'usdc api access' 'usdc-base-network' 'util':53 'valid':175 'varieti':42 'via':10,25 'wallet':197 'x402':11,26,35,84,112 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1273b26e-ffe9-4fda-89c6-e48019d50f69","listingId":"30e2556e-ae43-499c-be26-1fae21fa5d5a","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:28.238Z"}],"sources":[{"listingId":"30e2556e-ae43-499c-be26-1fae21fa5d5a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/144","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:28.238Z","lastSeenAt":"2026-04-23T21:32:45.692Z"}],"details":{"listingId":"30e2556e-ae43-499c-be26-1fae21fa5d5a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/144 \\\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 are 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 x402 challenge for /api/v1/transfers/144 requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/transfers/144"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access without subscriptions","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional API key billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.926Z"},"updatedAt":"2026-04-23T21:32:45.692Z"}}