{"id":"ddfe2a4a-dcd9-42dc-98c2-49df46636aac","shortId":"nTEbdA","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-enabled API platform that hosts a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and general-purpose utilities. All endpoints are pay-per-request using the x402 protocol, settling in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with each request.\n\nThe specific endpoint at `/api/v1/trades/99` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The endpoint accepts POST requests and is discoverable. The broader platform lists roughly 16 endpoints across four categories: Data & Analytics (metrics, reports, 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 priced identically at $0.02 per call.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all appear to show only a \"Connect wallet\" prompt with no substantive content. No OpenAPI spec, request/response schemas, or usage examples are available from the crawl. The exact nature of the data returned by `/api/v1/trades/99` is unclear; the description simply says \"Premium API Access\" without further detail.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["finance","data","api-platform"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","trades API","crypto payment API"],"warnings":["No OpenAPI specification or request/response schema available","Documentation pages (/docs, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt","The exact data returned by /api/v1/trades/99 is undocumented; 'Premium API Access' is not descriptive","Cannot verify what the broader platform endpoints actually return without further probing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/99","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/99","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 x402 402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The purpose of /api/v1/trades/99 specifically is unclear beyond the generic label 'Premium API Access'. Effectively a stub 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'valid':191 'wallet':223 'web3':179 'without':260 'x':98 'x-payment':97 'x402':2,19,39,72,119 'x402 API' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"9312af01-203f-4137-a347-084228f2fd06","listingId":"ddfe2a4a-dcd9-42dc-98c2-49df46636aac","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:16.141Z"}],"sources":[{"listingId":"ddfe2a4a-dcd9-42dc-98c2-49df46636aac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:16.141Z","lastSeenAt":"2026-04-23T23:03:08.408Z"}],"details":{"listingId":"ddfe2a4a-dcd9-42dc-98c2-49df46636aac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/99 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/99"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/99"},{"claim":"The platform lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or premium content behind a per-request USDC paywall","Integrating pay-as-you-go API calls into autonomous agent workflows","Consuming financial or analytics data without managing API keys or subscriptions"],"bestFor":["Agents or developers who want keyless, pay-per-request API access","Users already holding USDC on Base who want frictionless micropayments","Prototyping integrations that need instant access without signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.439Z"},"updatedAt":"2026-04-23T23:03:08.408Z"}}