Returns the best bid, best ask, and spread for an instrument.
Instrument identifier (e.g., SOL_USDC-28FEB26-150-C)
Ticker data
Best bid/ask for a single instrument
"SOL_USDC-28FEB26-150-C"
Best bid price in USDC micros (null if no bids)
1500000
Size at best bid in millicontracts
2000
Best ask price in USDC micros (null if no asks)
1600000
Size at best ask in millicontracts
1500
Spread in USDC micros
100000