Quote sizes are too small for some ETFs


So, while checking quotes data from API v2 GET/v2/stocks/{symbol}/quotes/latest or from the socket response, for some symbols quotes often have sizes of 1 or 2. Also, for some others, often the size is 0. (ie: bid size and ask size are 0, 1, or another small number)

Some examples:

  • QQQ (small qty)
  • DIA (qty 0)
  • QLD (small qty)

And this goes for an extensive list of ETFs. While checking other brokers, they usually show large quantities on the top of the book for the same symbols. By large I mean usually size > 1k.

How reliable is Alpaca quotes data? Why does it return such small numbers for quotes sizes?