Get Tickers

Get tickers information (best bid / ask, stats, etc.) for a multiple instruments.

For options: currency is required and expiry_date is required.
For perps: currency is optional, expiry_date will throw an error.
For erc20s: currency is optional, expiry_date will throw an error.

For most up to date stream of tickers, use the ticker.<instrument_name>.<interval> channels.