{"id":"a325fe4e-b25e-48e4-94ea-19d96566edd5","shortId":"JYLNNx","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 paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/charges/253` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises a broad catalog of endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, the crawled documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so there is no detailed schema, parameter documentation, or example responses available for any endpoint. The actual behavior and output of this specific \"Premium API Access\" endpoint is unclear from the available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific purpose and output of /api/v1/charges/253 ('Premium API Access') is not documented anywhere in the crawl","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/253","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/charges/253","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation beyond a landing page catalog, no example request/response bodies, and the specific purpose of the 'Premium API Access' endpoint at /charges/253 is undefined. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,109,149 '000':98 '0x8335':103 '20':97 '2913':104 '402':92 '402 payment api' '6':114 'access':88,195 'across':45 'actual':186 'advertis':118 'ai/ml':48 'analysi':126 'analyt':47 'api':5,20,37,69,87,194 'avail':181,201 'base':8,23,65,99,106 'base network api' 'behavior':187 'broad':120 'call':4,19,111 'catalog':121 'challeng':93 'classif':129 'commit':76 'connect':163 'content':169 'convers':141 'crawl':154 'data':46,143 'decim':115 'detail':174 'doc':157 'document':155,177 'embed':130 'enabl':36 'endpoint':44,55,80,123,184,196 'equal':108 'estim':138 'exampl':179 'exchang':133 'export':144 'feed':132 'finance/web3':50 'gas':137 'geocod':139 'howev':152 'includ':124 'infer':49 'infrastructur':52 'json-response' 'key':70 'limit':73 'list':84 'low payment fee' 'lowpaymentfee.com':31 'materi':202 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':40 'output':189 'page':156 'paid':57 'paramet':176 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'per':3,18,59,110 'per-request':58 'per-request-billing' 'platform':6,21,38,117 'point':151 'post-endpoint' 'premium':86,193 'price':131,150,158 'prompt':165 'quot':136 'rate':72,134 'readm':159 'request':60,94 'requir':77 'respons':180 'return':90,160 'schema':175 'sentiment':125 'specif':79,192 'substant':168 'summar':128 'text':127 'token':135 'unclear':198 'unit':100 'usdc':15,30,62,102,112 'usdc api' 'usdc-base' 'use':61,113 'util':53 'valid':140 'varieti':42 'via':10,25 'wallet':164 'x402':11,26,35 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e0dc447c-e951-4575-ad57-ef92613a1d54","listingId":"a325fe4e-b25e-48e4-94ea-19d96566edd5","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/charges/253","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:48.449Z"}],"sources":[{"listingId":"a325fe4e-b25e-48e4-94ea-19d96566edd5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/253","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:48.449Z","lastSeenAt":"2026-04-24T15:02:24.638Z"}],"details":{"listingId":"a325fe4e-b25e-48e4-94ea-19d96566edd5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/253 \\\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 requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/253"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/253"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Integrating x402 payment protocol into agent workflows for on-demand data or AI services","Accessing analytics, AI inference, or financial data endpoints with USDC micropayments"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","x402-compatible wallets and agents on the Base network","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume consumers needing bulk pricing or rate-limit guarantees","Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.428Z"},"updatedAt":"2026-04-24T15:02:24.638Z"}}