SERVICE

crypto-derivatives

Xynaptic Crypto Derivatives — perp market vitals: funding rate (hourly + annualized), open interest in USD, futures basis (mark vs oracle), max leverage. Parameter: ?asset=BTC. Hyperliquid perp data.

$0.05 per call · /v1/crypto-derivatives

Call it

curl -s https://api.xynaptic.io/v1/crypto-derivatives \
  -H "Accept: application/json"

# -> 402 Payment Required (x402 challenge: price, payTo, networks)
# -> sign the payment, retry with PAYMENT-SIGNATURE -> 200

What you get back

{
  "service": "crypto-derivatives",
  "asset": "BTC",
  "funding_annualized_pct": 8.2,
  "open_interest_usd": 412000000,
  "basis_pct": 0.12,
  "summary": "BTC perps: positive funding, $412M OI."
}