{"id":"6a4dd522-7b25-46db-8b27-6c11bbc646b6","shortId":"zLN6Dq","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that provides a collection 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, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/trades/33` is listed as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (0x8335...0913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised — access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/trades/33` endpoint actually returns. The endpoint path suggests trade-related data (possibly a specific trade record), but this is speculative. The platform's landing page confirms the general pricing model and endpoint catalog but provides no technical details about request formats or response payloads.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["data","llm","finance","geo"],"synonyms":["low payment fee","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","trade data API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific purpose and response format of /api/v1/trades/33 is unknown — 'Premium API Access' is not descriptive","The endpoint path '/api/v1/trades/33' does not appear in the landing page catalog, suggesting it may be unlisted or a test endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/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/trades/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 and returns a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page catalog, no request/response examples, and the specific purpose of /api/v1/trades/33 is unclear. The docs pages are empty 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'x402-payment' 'x402-protocol':38","prices":[{"id":"2a764a9d-168b-4d80-8ac2-09cb07038f4c","listingId":"6a4dd522-7b25-46db-8b27-6c11bbc646b6","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/trades/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":"2026-04-18T18:57:52.094Z"}],"sources":[{"listingId":"6a4dd522-7b25-46db-8b27-6c11bbc646b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:52.094Z","lastSeenAt":"2026-04-22T23:02:05.857Z"}],"details":{"listingId":"6a4dd522-7b25-46db-8b27-6c11bbc646b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/33 \\\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 API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/33"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data or analytics on a per-request basis without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) via micropayments","Retrieving real-time crypto quotes, gas estimates, or exchange rates","Geocoding or data validation as a utility service"],"bestFor":["Agents or developers who want zero-commitment, pay-as-you-go API access","x402-compatible clients that can settle USDC on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request costs add up quickly","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.613Z"},"updatedAt":"2026-04-22T23:02:05.857Z"}}