{"id":"fd08e894-1a88-4592-a007-1c58ee3e2f82","shortId":"EgD9Mw","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 gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/37` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform advertises four broad categories of APIs: 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. However, the specific `/api/v1/trades/37` endpoint does not appear in the publicly listed catalog on the landing page, so its exact functionality is unclear — the description simply says \"Premium API Access\" without further detail.\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 spec, no request/response examples, and no detailed description of what the `/api/v1/trades/37` endpoint actually returns. The endpoint is confirmed live via a valid 402 challenge, but the lack of documentation makes it difficult to know what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","trades API","premium data endpoint"],"warnings":["The endpoint /api/v1/trades/37 does not appear in the site's public API catalog — its exact functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response examples are available.","The purpose and data returned by this specific endpoint cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/trades/37 is unknown. The docs pages are all empty wallet-connect prompts. This is effectively a stub 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'x402-payment'","prices":[{"id":"0e79d8bd-e912-4fe3-9e14-a3481be922f4","listingId":"fd08e894-1a88-4592-a007-1c58ee3e2f82","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:50.303Z"}],"sources":[{"listingId":"fd08e894-1a88-4592-a007-1c58ee3e2f82","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:50.303Z","lastSeenAt":"2026-04-26T04:32:50.270Z"}],"details":{"listingId":"fd08e894-1a88-4592-a007-1c58ee3e2f82","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/37 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/trades/37"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/37"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data or services via a single micropayment without needing an API key","Integrating pay-per-call endpoints into autonomous agent workflows on the Base network","Programmatic access to premium API resources settled in USDC"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 micropayments autonomously","Users who prefer crypto-native payment rails over traditional API key subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.683Z"},"updatedAt":"2026-04-26T04:32:50.270Z"}}