{"id":"9268fcd6-2e6c-4add-896d-d5773f5ea8ee","shortId":"2uXhYV","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 marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transfers/94` is listed as \"Premium API Access\" and follows the same x402 payment pattern.\n\nThe platform advertises four categories of APIs: 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 endpoints accept POST requests and return JSON.\n\nHowever, the specific endpoint `/api/v1/transfers/94` does not clearly map to any of the documented API categories. Its x402 challenge shows a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's advertised pricing. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so details about request/response schemas, actual functionality behind this particular endpoint, and what data it returns are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","usdc api","base network api","402 payment api"],"warnings":["The endpoint path /api/v1/transfers/94 does not correspond to any of the documented API categories on the landing page — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) are effectively empty, showing only 'Connect wallet'.","No OpenAPI spec, request schema, or response schema is available — integration requires trial and error.","The purpose and output of this specific endpoint cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/94","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint path '/api/v1/transfers/94' doesn't match any documented API category. All doc pages return only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,57,175 '20000':166 '402 payment api' '6':171 'accept':137 'access':88 'across':45 'actual':204 'advertis':98,181 'ai':110 'ai/ml':48 'analysi':114 'analyt':47,104 'api':5,20,37,69,87,102,157 'base':8,23,65,167 'base network api' 'behind':206 'beyond':184 'call':4,19 'categori':100,158 'challeng':161 'classif':117 'clear':150 'commit':76 'connect':197 'consist':176 'convers':133 'cost':56 'data':46,103,107,212 'decim':172 'detail':200 'document':156,183 'embed':118 'empti':190 'enabl':36 'endpoint':44,55,80,136,146,209 'equal':174 'essenti':189 'estim':128 'everi':54 'exchang':123 'export':108 'feed':122 'financ':119 'finance/web3':50 'follow':90 'four':99 'function':205 'gas':127 'generat':134 'geocod':131 'howev':143 'infer':49 'infrastructur':52,130 'insight':109 'json':142 'json-api' 'key':70 'land':186 'learn':112 'limit':73 'list':84 'low payment fee' 'lowpaymentfee.com':31 'machin':111 'map':151 'marketplac':38 'maxamountrequir':164 'metric':105 'micropayment api' 'network':9,24,66 'offer':40 'page':187,194 'paid':60 'particular':208 'pattern':95 'pay':2,17 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request' 'payment':94 'per':3,18,58 'platform':6,21,97 'post':138 'post-method' 'premium':86 'price':121,182 'quot':126 'rate':72,124 'report':106 'request':59,139 'request/response':202 'requir':77 'return':141,214 'schema':203 'sentiment':113 'show':162,196 'site':179 'specif':79,145 'sub':193 'sub-pag':192 'summar':116 'text':115 'token':125 'unit':168 'unknown':216 'usdc':15,30,62,170 'usdc api' 'usdc-base-network' 'util':53 'valid':132 'varieti':42 'via':10,25 'wallet':198 'web3':120 'x402':11,26,35,93,160 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"401e621d-bf03-4645-929e-b8a325a4b33b","listingId":"9268fcd6-2e6c-4add-896d-d5773f5ea8ee","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:14.851Z"}],"sources":[{"listingId":"9268fcd6-2e6c-4add-896d-d5773f5ea8ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:14.851Z","lastSeenAt":"2026-04-22T15:02:27.608Z"}],"details":{"listingId":"9268fcd6-2e6c-4add-896d-d5773f5ea8ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/94 \\\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 cost $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 this endpoint shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transfers/94"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without API key management","Pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.881Z"},"updatedAt":"2026-04-22T15:02:27.608Z"}}