x402-payable API offering trades data, analytics, AI, finance, and utility endpoints at $0.02/request on Base.
What it does
lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments — payment is handled inline via the x402 protocol on the Base network using USDC.
The specific endpoint at `/api/v1/trades/200` is listed as "Premium API Access" and accepts POST requests. Based on the x402 challenge, the maximum amount required is 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The site advertises a uniform $0.02/request price across all its endpoints. Payment settles to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/trades/200` endpoint actually returns. The endpoint name and path suggest it may return trade data (possibly the last 200 trades or a trade with ID 200), but this is speculative. The site's homepage groups endpoints into categories but does not list this specific trades endpoint among them, adding further ambiguity.
Capabilities
Use cases
- —Fetching trade data via a single paid API call without needing an API key
- —Integrating low-cost per-request data access into autonomous agent workflows
- —Programmatic access to trade information settled on Base L2 with USDC
Fit
Best for
- —Agents or scripts that need keyless, pay-per-use API access
- —Developers experimenting with x402 payment protocol integrations
- —Low-volume consumers who want no subscription or rate-limit overhead
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-USDC or non-Base-network payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/200 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) with clear pricing ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /trades/200 endpoint is unclear. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt
- —No OpenAPI or JSON schema describing request parameters or response format
- —The /api/v1/trades/200 endpoint is not listed on the homepage's endpoint catalog, making its purpose unclear
- —Cannot verify what data this endpoint actually returns without making a paid request
Citations
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network with 300s timeouthttps://lowpaymentfee.com/api/v1/trades/200
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/200
- —Docs, pricing, API, and README pages render only a Connect wallet prompt with no contenthttps://lowpaymentfee.com/docs