x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of 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 via the x402 protocol — no API keys, no rate limits, and no upfront commitments.
The specific endpoint `/api/v1/trades/23` is listed as "Premium API Access" and was probed live, returning a valid 402 challenge. The challenge specifies an exact-scheme payment of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
Note that while the landing page lists many endpoints, the `/api/v1/trades/23` path does not appear among them and its specific functionality ("Premium API Access") is not documented beyond the title. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional documentation. The actual data returned by this endpoint is unknown.
Capabilities
Use cases
- —Accessing trade data or premium content via a single micropayment
- —Integrating pay-per-request APIs into agent workflows without managing API keys
- —Programmatic access to financial or analytics data with crypto-native billing
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who need bulk/subscription pricing
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/23 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for the /api/v1/trades/23 endpoint specifically, no request/response schema, no examples, and the docs pages are empty. The endpoint's actual functionality is unknown beyond the generic 'Premium API Access' label.
Warnings
- —The /api/v1/trades/23 endpoint is not listed on the provider's landing page among its advertised APIs — its purpose is unclear.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —No request body schema or response schema is available; callers cannot know what to send or what to expect back.
- —The endpoint name 'Premium API Access' is generic and does not describe the data or service provided.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The 402 challenge specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/trades/23
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —Docs, pricing, API, and README pages show only a 'Connect wallet' prompt with no additional content.https://lowpaymentfee.com/docs