Instrument symbols, or ["*"] for every instrument the exchange/segment offers (tier-gated).
Both ticker and kline connect to the lightest (fastest) cadence available for the exchange — today, 1 tick/second on every supported exchange. Choosing a specific cadence is not offered yet.
Venue category. cx (centralized exchange) is the only one live runs support today.
One market feed a live run consumes. Exactly one entry per run today.