First of all, let me thank the Alpaca team for delivering snapshot API, extremely useful to check prices for 1000+ tickers in one shot!
I found the updating frequency is 1 minute, is it possible to increase the frequency during market open/close time? like first 15 min into open, and 15 min before closing. The reason is that during these two periods, prices are very critical for making quick decisions, it would be nice to have snapshots being updated more frequently during first and last 15 mins.