{"id":"51e73625-d677-4bd8-8684-cef15e1bb263","shortId":"YVNwFc","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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/267` 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. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises categories including: 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). However, the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind each endpoint is unverified. The specific purpose of the `/api/v1/transactions/267` endpoint is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai-ml","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The specific functionality of /api/v1/transactions/267 ('Premium API Access') is not documented anywhere — its purpose is unknown.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no actual content.","No OpenAPI spec, request schema, or response schema is available.","The broad catalog of endpoints (AI, finance, data, utils) is advertised on the landing page but none have been independently verified for functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/267","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/transactions/267","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of the /api/v1/transactions/267 endpoint is entirely unclear. The docs, API, pricing, and README pages are all empty 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'/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':131 '402':106 '402 payment api' 'accept':136 'access':102 'account':76 'actual':202 'advertis':145 'ai':155 'ai/ml':49 'analysi':159 'analyt':48,149 'api':5,20,37,74,101,186 'application/json':141 'attach':84 'avail':219 'base':8,23,71,113,120 'base network api' 'base-network' 'behind':204 'broad':42 'broader':143 'call':4,19 'caller':82 'catalog':43 'categori':146 'challeng':107 'classif':162 'connect':193 'content':199 'convers':178 'crawl':182 'data':47,52,148,152 'doc':185 'document':183 'embed':163 'enabl':36 'endpoint':45,57,94,135,206,215 'equal':122 'estim':173 'exact':128 'exchang':168 'export':153 'feed':167 'financ':164 'finance/web3':51 'function':203 'gas':172 'generat':179 'geocod':176 'header':88 'howev':180 'includ':147 'infer':50 'infrastructur':175 'insight':154 'json-response' 'key':75 'learn':157 'limit':79 'list':98 'low payment fee' 'lowpaymentfee.com':31 'machin':156 'materi':220 'metric':150 'micropayment api' 'network':9,24,72 'no-api-key' 'offer':40 'page':184 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,125 'per':3,18,61 'platform':6,21,38,144 'post':137 'post-method' 'premium':100 'price':166,187 'prompt':195 'purpos':211 'quot':171 'rate':78,169 'readm':188 'report':151 'request':62,91,108,138 'requir':81 'return':104,140,190 'scheme':126 'second':132 'sentiment':158 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93,210 'substant':198 'summar':161 'text':160 'timeout':133 'token':170 'unclear':217 'unit':114 'unverifi':208 'usdc':15,30,68,116 'usdc api' 'usdc-settlement' 'util':54 'valid':177 'via':10,25 'wallet':194 'web3':165 'x402':11,26,35,86 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"df99dd09-61e6-416e-9dbc-0ae352f4a103","listingId":"51e73625-d677-4bd8-8684-cef15e1bb263","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/transactions/267","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:42.231Z"}],"sources":[{"listingId":"51e73625-d677-4bd8-8684-cef15e1bb263","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/267","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:42.231Z","lastSeenAt":"2026-04-23T16:02:57.130Z"}],"details":{"listingId":"51e73625-d677-4bd8-8684-cef15e1bb263","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/267 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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 x402 challenge for /api/v1/transactions/267 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/267"},{"claim":"The platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports on a per-request basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with micropayments","Fetching financial data like exchange rates, token quotes, and gas estimates","Using utility services like geocoding, validation, and conversion"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost API calls without managing API keys or rate limits"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.482Z"},"updatedAt":"2026-04-23T16:02:57.130Z"}}