{"id":"067453c5-cfe4-41eb-8265-5c274c58b1e6","shortId":"wdrSvN","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/33` is listed as \"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 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 site claims no rate limits and instant access.\n\nImportant caveat: the specific endpoint probed (`/api/v1/keys/33`) does not clearly map to any of the named API categories on the landing page. Its description is simply \"Premium API Access,\" and no documentation, request/response schemas, or usage examples are available. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without concrete documentation on what this endpoint actually returns, callers should treat it as an opaque paid resource until more information is available.","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","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No API documentation available — /api, /pricing, and /README pages all returned only 'Connect wallet' with no content","The endpoint /api/v1/keys/33 ('Premium API Access') does not correspond to any named endpoint on the landing page; its actual functionality is unknown","No request or response schema is provided; callers cannot know what to send or expect back","No OpenAPI spec, ai-plugin manifest, or agents.txt discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/33","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/33","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), but there is no documentation, no request/response schema, no examples, and the specific endpoint's purpose ('Premium API Access') is vague. The /api, /pricing, and /README pages returned no useful content. This is effectively a stub 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'x402-payment'","prices":[{"id":"e4ea366e-c538-4ed8-abd2-a94b823269b1","listingId":"067453c5-cfe4-41eb-8265-5c274c58b1e6","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.459Z"}],"sources":[{"listingId":"067453c5-cfe4-41eb-8265-5c274c58b1e6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.459Z","lastSeenAt":"2026-04-22T01:02:18.785Z"}],"details":{"listingId":"067453c5-cfe4-41eb-8265-5c274c58b1e6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/33 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/33"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/33"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on demand","Programmatic data export and analytics retrieval with per-call billing"],"bestFor":["Agents or bots that need instant, keyless API access with crypto micropayments","Developers prototyping against multiple API categories without committing to subscriptions","Web3-native applications that can settle payments in USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.774Z"},"updatedAt":"2026-04-22T01:02:18.785Z"}}