{"id":"efd1b01c-2ddf-407d-bfd6-601273877abe","shortId":"xmqm3x","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 at a flat rate of $0.02 per call, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/invoices/16` is listed as \"Premium API Access\" and returns an x402 challenge requesting payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address. The endpoint accepts POST requests and returns 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 data generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, API reference) appear to be behind a wallet-connect gate and provide no substantive content in the crawl. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found, so the actual behavior and output of this specific invoices endpoint is unclear.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 api","pay-per-call api","micropayment api","usdc api access","base network api","low fee api","crypto-paid api"],"warnings":["No OpenAPI or detailed endpoint documentation available — all doc pages return only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/invoices/16 is undocumented","No request body schema or response schema could be determined from available material","Platform appears to be a demo or early-stage project with many advertised endpoints but no verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/16","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/invoices/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no request/response examples, and all documentation pages are gated behind wallet-connect with no content. The purpose of the specific /invoices/16 endpoint is unclear beyond its generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,72,117,173 '000':106 '0x8335':111 '20':105 '2913':112 '6':121 'accept':137 'access':96 'across':45 'actual':213 'address':134 'advertis':146 'ai/ml':48 'analysi':150 'analyt':47 'api':5,20,37,77,95,181 'appear':183 'application/json':142 'base':8,23,65,107,114 'base network api' 'behavior':214 'behind':186 'broader':144 'call':4,19,74 'challeng':101 'classif':153 'commit':84 'connect':190 'content':196 'convers':165 'crawl':199 'crypto-paid api' 'data':46,167 'decim':122 'detail':206 'doc':179 'document':177,208 'embed':154 'enabl':36 'endpoint':44,55,88,136,147,207,221 'equal':116 'estim':162 'exact':129 'exampl':204 'exchang':157 'feed':156 'finance/web3':50 'flat':69 'found':210 'gas':161 'gate':191 'generat':168 'geocod':163 'given':118 'howev':176 'infer':49 'infrastructur':52 'invoic':220 'json-response' 'key':78 'limit':81 'list':92 'low fee api' 'lowpaymentfee.com':31 'made':125 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':40 'openapi':201 'output':216 'page':178 'paid':57 'pay':2,17 'pay-per-cal':1,16 'pay-per-call api' 'payment':103,123 'payto':133 'per':3,18,59,73 'per-request':58 'per-request-billing' 'platform':6,21,38,145 'point':175 'post':138 'post-endpoint' 'premium':94 'price':155,174,180 'provid':193 'quot':160 'rate':70,80,158 'refer':182 'request':60,102,139 'request/response':203 'requir':85 'return':98,141 'schema':202 'scheme':130 'sentiment':149 'specif':87,219 'substant':195 'summar':152 'text':151 'token':159 'unclear':223 'unit':108 'usdc':15,30,62,110,119 'usdc api access' 'usdc-base' 'use':61 'util':53 'valid':164 'varieti':42 'via':10,25,126 'wallet':189 'wallet-connect':188 'x402':11,26,35,100,128 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ad9ff049-3bd7-4264-a35a-b8dedcf8fe6c","listingId":"efd1b01c-2ddf-407d-bfd6-601273877abe","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/invoices/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:21.331Z"}],"sources":[{"listingId":"efd1b01c-2ddf-407d-bfd6-601273877abe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:21.331Z","lastSeenAt":"2026-04-25T06:02:53.221Z"}],"details":{"listingId":"efd1b01c-2ddf-407d-bfd6-601273877abe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/16 \\\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":"Flat pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/16"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic invoice or data retrieval without subscription commitments"],"bestFor":["Developers wanting frictionless pay-per-use API access without API keys","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.928Z"},"updatedAt":"2026-04-25T06:02:53.221Z"}}