{"id":"febe51eb-f448-45e8-9270-7391a36d2d3e","shortId":"fSwRSk","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/12` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header to each request.\n\nThe wider platform advertises four endpoint categories: 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 utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. The platform claims no rate limits, no minimums, and instant access.\n\nNote that the specific functionality behind `/api/v1/keys/12` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live — it returns a valid x402 402 challenge — but what data or service it actually provides is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific functionality of /api/v1/keys/12 ('Premium API Access') is undocumented — unclear what data or service it provides","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content","No request or response examples available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/12","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/keys/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/keys/12 actually returns. The crawled pages beyond the landing page were empty. The listing is effectively a stub with pricing info 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'x402-payment'","prices":[{"id":"66d00963-47b6-40ef-8f7f-f0b04707e999","listingId":"febe51eb-f448-45e8-9270-7391a36d2d3e","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/keys/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.412Z"}],"sources":[{"listingId":"febe51eb-f448-45e8-9270-7391a36d2d3e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.412Z","lastSeenAt":"2026-04-22T05:32:12.202Z"}],"details":{"listingId":"febe51eb-f448-45e8-9270-7391a36d2d3e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/12 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/12"},{"claim":"All listed 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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is settled in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/12"}],"useCases":["Accessing data analytics and reports without creating an account or managing API keys","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching financial data such as price feeds, exchange rates, and gas estimates via crypto micropayments","Using utility endpoints like geocoding, validation, and conversion with instant USDC settlement"],"bestFor":["Developers who want zero-friction API access without subscriptions or API key management","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer pay-per-use pricing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly without bulk discounts","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.78Z"},"updatedAt":"2026-04-22T05:32:12.202Z"}}