{"id":"c5f739c2-65d9-482f-b36e-e6df28bd7ab6","shortId":"TadW4y","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 infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a signed USDC payment in the X-PAYMENT header and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transactions/247` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. The payment recipient is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no substantive content — only 'Connect wallet' prompts","No OpenAPI or schema available; request and response formats are unknown","The specific endpoint /api/v1/transactions/247 has a generic 'Premium API Access' description with no detail on what it actually returns","The broad catalog of advertised endpoints (AI, finance, analytics, utilities) is unverified — actual functionality is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/247","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/247","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation content (all doc pages show only 'Connect wallet'), no example request/response bodies, and the specific purpose of '/api/v1/transactions/247' is unexplained. The platform advertises many endpoints but provides no verifiable details about any of 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'/docs':203 '/pricing':204 '/readme':205 '/request':13,28 '0.02':12,27,61,139,197 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x8335':133 '20':127 '2913':134 '300':160 '6':143 'Base network API' 'USDC micropayment API' 'accept':147 'access':115 'actual':218 'advertis':122,166 'ai-inference' 'ai/ml':49 'amount':125 'analysi':175 'analyt':48 'api':5,20,37,73,114 'application/json':118 'attach':89 'base':8,23,69,129,136 'behavior':219 'broad':42 'broader':164 'call':4,19 'caller':88 'catalog':43 'categori':167 'challeng':121 'classif':178 'commit':81 'connect':209 'content':215 'convers':190 'crypto-paid API' 'data':47,52,171 'data-analytics' 'decim':144 'discover':152 'document':201 'embed':179 'enabl':36 'endpoint':45,57,107,146,225 'equal':138 'estim':187 'everi':56 'exchang':182 'export':172 'feed':181 'finance-data' 'finance/web3':51 'gas':186 'generat':192 'geocod':188 'given':140 'handl':85 'header':99 'howev':200 'immedi':104 'includ':168 'infer':50 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'x402-payment'","prices":[{"id":"9a47740c-3a13-43c1-ab8c-2e045734c819","listingId":"c5f739c2-65d9-482f-b36e-e6df28bd7ab6","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/247","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:31.774Z"}],"sources":[{"listingId":"c5f739c2-65d9-482f-b36e-e6df28bd7ab6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/247","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:31.774Z","lastSeenAt":"2026-04-22T19:32:15.921Z"}],"details":{"listingId":"c5f739c2-65d9-482f-b36e-e6df28bd7ab6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/247 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, 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/transactions/247"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing analytics metrics and reports without managing API keys or subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching real-time crypto token quotes, gas estimates, and exchange rates","Geocoding, data validation, and format conversion via utility endpoints"],"bestFor":["Agents and bots that need frictionless, keyless API access paid per call","Developers who want to avoid subscription commitments for occasional API usage","Web3-native applications that can sign USDC payments on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.005Z"},"updatedAt":"2026-04-22T19:32:15.921Z"}}