{"id":"96782d86-4cfe-4807-8385-899881e11b15","shortId":"zrHyks","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 across four 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/keys/41` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). Payment is made by including an X-PAYMENT header; no API keys, subscriptions, or rate limits are required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages. The exact functionality behind the \"Premium API Access\" label at `/api/v1/keys/41` is unclear and may differ from the other listed endpoints.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay per call API","micropayment API","USDC API","Base network API","metered API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/keys/41 ('Premium API Access') is not documented — it may be an API key provisioning endpoint rather than a data endpoint","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content","No request or response examples are available; integration requires trial-and-error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/41","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/keys/41 ('Premium API Access') is unexplained. The /api, /pricing, and /README pages are all gated behind a wallet connect prompt with no 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'x402-payment'","prices":[{"id":"c35b46a8-e848-4f0e-907a-c3e5e1734e76","listingId":"96782d86-4cfe-4807-8385-899881e11b15","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.523Z"}],"sources":[{"listingId":"96782d86-4cfe-4807-8385-899881e11b15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.523Z","lastSeenAt":"2026-04-22T01:02:18.868Z"}],"details":{"listingId":"96782d86-4cfe-4807-8385-899881e11b15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/41 \\\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":"All endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is settled in USDC on the Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/keys/41 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/keys/41"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayment","Running geocoding or data validation calls with no subscription commitment","Exporting analytics data or generating reports on a per-request billing model"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers who want to avoid API key management and subscription overhead","Low-volume or bursty workloads where $0.02/request micropayments are cost-effective"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed SLA guarantees, rate-limit documentation, or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.661Z"},"updatedAt":"2026-04-22T01:02:18.868Z"}}