{"id":"8202872e-e1ba-47d2-94cd-9a62b2c18ef1","shortId":"2TvRae","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 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/60` is listed as \"Premium API Access\" and accepts POST requests settled via the x402 exact-payment scheme.\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 follow the same $0.02 pricing model.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The x402 challenge confirms the endpoint is live and accepts USDC (contract 0x8335…) on Base, with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No OpenAPI specification or request/response schema available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/transfers/60 ('Premium API Access') has no description of what it actually does or what inputs it expects","Cannot verify what data or functionality any of these endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/60","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/60","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 zero documentation beyond the landing page listing. No OpenAPI spec, no request/response schemas, no examples, and all doc pages just show 'Connect wallet'. The specific endpoint '/api/v1/transfers/60' has no description beyond its title. This is effectively a stub 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'/api/v1/transfers/60':84 '/docs':155 '/pricing':157 '/readme':159 '/request':13,28 '0.02':12,27,59,147,216 '000':212 '0x8335':203 '20':211 '6':220 'accept':92,200 'access':90 'advertis':105 'ai':117 'ai-inference' 'ai/ml':49 'amount':209 'analysi':121 'analyt':48,111 'api':5,20,37,71,89,109 'avail':186 'base':8,23,67,205,213 'base network api' 'broad':42 'call':4,19 'categori':107 'challeng':193 'classif':124 'classification' 'commit':78 'confirm':194 'connect':165 'content':190 'contract':202 'convers':140 'conversion' 'cost':58 'crawl':189 'crypto api access' 'crypto-quotes' 'data':47,52,110,114 'data-analytics' 'decim':221 'detail':172 'document':150,181 'embed':125 'embeddings' 'enabl':36 'endpoint':45,57,82,143,196 'estim':135 'everi':56 'exact':100 'exact-pay':99 'exampl':185 'exchang':130 'export':115 'extrem':152 'feed':129 'financ':126 'finance-data' 'finance/web3':51 'follow':144 'four':106 'gas':134 'generat':141 'geocod':138 'geocoding' 'given':217 'i.e':215 'infer':50 'infrastructur':54,137 'insight':116 'key':72 'learn':119 'limit':75 'list':86 'live':198 'low payment fee' 'lowpaymentfee.com':31 'machin':118 'max':208 'metric':112 'micropayment api' 'model':149 'network':9,24,68 'offer':40 'openapi':176 'page':160 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':101 'per':3,18,60 'platform':6,21,38,104 'post':93 'premium':88 'price':128,148 'prompt':167 'quot':133 'rate':74,131 'render':162 'report':113 'request':61,94 'request/response':179 'requir':79 'schema':180 'scheme':102 'sentiment':120 'sentiment-analysis' 'set':43 'settl':95 'span':46 'spars':153 'spec':177 'specif':81 'summar':123 'technic':171 'text':122 'text-summarization' 'token':132 'unit':214 'usag':184 'usdc':15,30,64,201,218 'usdc api' 'usdc-base-network' 'util':55 'valid':139 'validation' 'via':10,25,96 'wallet':166 'web3':127 'x402':11,26,35,98,192 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e4b93094-659a-4911-86a6-8c876e334244","listingId":"8202872e-e1ba-47d2-94cd-9a62b2c18ef1","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:59.081Z"}],"sources":[{"listingId":"8202872e-e1ba-47d2-94cd-9a62b2c18ef1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:59.081Z","lastSeenAt":"2026-04-22T08:31:51.232Z"}],"details":{"listingId":"8202872e-e1ba-47d2-94cd-9a62b2c18ef1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/60 \\\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 platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/60"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/60"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto quotes on a per-request basis","Using utility services like geocoding, validation, and data conversion with micropayments","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access paid in USDC","Developers who want pay-as-you-go pricing with no subscription commitment","Web3-native applications that can settle payments on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.51Z"},"updatedAt":"2026-04-22T08:31:51.232Z"}}