{"id":"33ebf389-b7c4-48cd-9cdf-6bc0d78fdada","shortId":"PPPD5B","kind":"x402","title":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request, no API keys needed.","tagline":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request, no API keys needed.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol means no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/invoices/18` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. 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 beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a \"Connect wallet\" prompt), so the actual functionality, request/response schemas, and data sources behind each endpoint are unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all return only a 'Connect wallet' prompt with no actual content.","No OpenAPI or schema available — request and response formats for this endpoint are unknown.","The endpoint path '/api/v1/invoices/18' with description 'Premium API Access' is ambiguous; its actual functionality is unclear.","The broader platform claims many endpoint categories (AI, finance, geo, etc.) but none are individually verified beyond the landing page listing."],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/18","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/18","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 request/response examples, and all documentation pages beyond the landing page are empty stubs. The specific purpose of /api/v1/invoices/18 ('Premium API Access') is vague and undocumented. This is effectively a stub 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'need':19,38 'network':81 'no-auth api' 'offer':48 'page':197,205 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':11,30,99,142 'per':3,22,55,73 'platform':6,25,46,161 'point':191 'post':154 'premium':112 'price':70,171,190,202 'prompt':212 'protocol':84 'quot':176 'rate':93,174 'render':207 'request':56,74,103,120,155 'request/response':217 'return':116,157 'schema':218 'scheme':143 'second':149 'sentiment':165 'sentiment-analysis' 'servic':66 'settl':75 'simpli':96 'sourc':221 'spars':200 'specif':105 'summar':168 'text':167 'text-summarization' 'timeout':150 'token':175 'unit':126 'unverifi':226 'usdc':10,29,77,128,137 'usdc api' 'usdc-base' 'util':65 'utility-services' 'valid':180 'via':12,31 'wallet':211 'x402':13,32,43,83,118 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"38aa0a8a-3877-41a6-b0f2-fd4d7e0a072f","listingId":"33ebf389-b7c4-48cd-9cdf-6bc0d78fdada","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:17.415Z"}],"sources":[{"listingId":"33ebf389-b7c4-48cd-9cdf-6bc0d78fdada","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:17.415Z","lastSeenAt":"2026-04-23T20:01:38.333Z"}],"details":{"listingId":"33ebf389-b7c4-48cd-9cdf-6bc0d78fdada","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/18 \\\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 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/invoices/18"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Programmatic access to AI inference (sentiment, summarization, classification, embeddings) at micro-payment scale","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call billing","Geocoding or data validation as a lightweight utility service"],"bestFor":["AI agents and bots that can settle x402 payments autonomously","Developers wanting zero-signup, pay-as-you-go API access on Base","Low-volume or sporadic API consumers who don't want monthly commitments"],"notFor":["High-volume production workloads where per-call overhead matters (no bulk pricing documented)","Users who need detailed API documentation, SLAs, or guaranteed uptime","Consumers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.149Z"},"updatedAt":"2026-04-23T20:01:38.333Z"}}