Perp Funding Rates ($0.004/call)

Live perpetual-futures funding rates from Hyperliquid: per-coin funding rate, mark price, and open interest. Query: coins (optional comma list, e.g. BTC,ETH,SOL), limit (default 20, ranked by absolute funding). Use to monitor funding, hunt basis trades, and time entries. Real-time, keyless.

Paid endpoint: $0.004 per call via the x402 protocol (USDC on Base). An unpaid request returns 402 with payment requirements in the PAYMENT-REQUIRED response header; attach payment and retry.