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curl "https://api.polynode.dev/v3/perps/book/BTC-USD?depth=5&key=$POLYNODE_API_KEY"

{
  "instrument_id": 6,
  "symbol": "BTC-USD",
  "bids": [["62009", "0.03999"], ["62000", "0.04604"]],
  "asks": [["62010", "0.05098"], ["62016", "0.0002"]],
  "timestamp": 1783571023159
}
Levels are [price, quantity] pairs, best-first on both sides (bids descending, asks ascending).

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Query parameters

ParameterDescription
depthLevels per side (default: full book)
For streaming updates subscribe to perps_book:<instrument> — you get a full snapshot on subscribe, then updates as the book changes.