{"id":"d69cf02e-1db7-4559-9e02-d9711174381f","shortId":"nbQhBe","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 broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment protocol means agents or users simply attach a payment header to each HTTP call.\n\nThe specific endpoint at `/api/v1/transfers/8` 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 charges a maximum of 20,000 base units of USDC (0.02 USD) per call on the Base network, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `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 generation — all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) returned only a \"Connect wallet\" prompt with no further technical detail, so request/response schemas for any endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["infrastructure","general-purpose"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base network api","usdc api"],"warnings":["The exact purpose and functionality of /api/v1/transfers/8 ('Premium API Access') is undocumented — it is unclear what data or service it provides.","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no technical content.","No request body schema or response schema is available for any endpoint on this platform.","The broad range of advertised endpoints (AI, finance, analytics, utilities) could not be verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/8","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/8","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 per call on Base). However, there is no documentation for the specific /transfers/8 endpoint, no request or response schema, and all doc pages return only 'Connect wallet' with no content. The endpoint's actual functionality is 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'/api/v1/transfers/8':103 '/docs':194 '/pricing':195 '/readme':197 '/request':13,28 '0.02':12,27,61,141,188 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '20':135 'accept':127 'access':109 'address':151 'advertis':162 'agent':87 'ai/ml':49 'analysi':166 'analyt':48 'api':5,20,37,73,108 'application/json':158 'attach':91 'base':8,23,69,137,147 'base network api' 'beyond':117 'broad':42 'broader':160 'call':4,19,98,144 'challeng':122 'charg':131 'classif':169 'commit':81 'confirm':123 'connect':201 'convers':181 'data':47,52 'detail':208 'document':116,192 'embed':170 'enabl':36 'endpoint':45,57,101,163,214 'estim':178 'everi':56 'exact':112 'exchang':173 'feed':172 'finance/web3':51 'function':113 'gas':177 'generat':183 'geocod':179 'header':94 'howev':191 'http':97 'infer':50 'infrastructur':54 'json-api' 'key':74 'label':119 'limit':77 'list':105 'live':126 'low payment fee' 'lowpaymentfee.com':31 'maximum':133 'mean':86 'micropayment api' 'mime':155 'network':9,24,70,148 'no-api-key' 'offer':40 'page':193 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':64 'payment':84,93 'per':3,18,62,143 'platform':6,21,38,161 'point':190 'post':128 'post-method' 'premium':107 'price':59,171,189 'prompt':203 'protocol':85 'quot':176 'rate':76,174 'request':63,129 'request/response':210 'respons':154 'return':198 'schema':211 'sentiment':165 'set':43 'settl':149 'simpli':90 'span':46 'specif':100 'summar':168 'technic':207 'text':167 'token':175 'type':156 'unit':138 'unknown':216 'upfront':80 'usd':142 'usdc':15,30,66,140 'usdc api' 'usdc-base-network' 'user':89 'util':55 'valid':180 'via':10,25 'wallet':202 'x402':11,26,35,83,121 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f4054fe2-1b85-4edc-94a3-d6240294e0d6","listingId":"d69cf02e-1db7-4559-9e02-d9711174381f","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:00.276Z"}],"sources":[{"listingId":"d69cf02e-1db7-4559-9e02-d9711174381f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:00.276Z","lastSeenAt":"2026-04-23T17:32:24.011Z"}],"details":{"listingId":"d69cf02e-1db7-4559-9e02-d9711174381f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/8 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/8"},{"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 platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/8"}],"useCases":["Agent-driven API consumption where per-call USDC micropayments replace traditional API keys","Accessing data analytics, AI inference, or financial data without subscription commitments","Programmatic pay-as-you-go access to utility services like geocoding, validation, and conversion"],"bestFor":["Developers or agents wanting zero-setup, keyless API access via x402","Micropayment experimentation on Base L2 with USDC","Scenarios requiring no rate limits and instant access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call pricing may be inefficient compared to bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.447Z"},"updatedAt":"2026-04-23T17:32:24.011Z"}}