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All instruments at once: 
curl "https://api.polynode.dev/v3/perps/tickers?key=$POLYNODE_API_KEY"
One instrument — by id, symbol, or bare asset: 
curl "https://api.polynode.dev/v3/perps/tickers/btc?key=$POLYNODE_API_KEY"

{
  "instrument_id": 6,
  "symbol": "BTC-USD",
  "index_price": "62022",
  "mark_price": "62010",
  "last_price": "61989",
  "mid_price": "62010",
  "open_interest": "67.44542",
  "funding_rate": "0.0000125",
  "next_funding": 1783573200000,
  "timestamp": 1783571023159
}
FieldMeaning
index_priceExternal reference price of the underlying
mark_priceExchange mark used for margining and liquidations
last_pricePrice of the most recent trade
mid_priceOrderbook midpoint
open_interestOpen contracts (base-asset units)
funding_rateCurrent hourly funding rate
next_fundingWhen the next funding payment occurs (ms)
Tickers update continuously; for sub-second consumption use the perps_tickers WebSocket channel.