Working out the spread from depthUpdate data

API Futures API
1

  1. What does it mean in the documentation where it says “bids to update”, “asks to update”: https://binance-docs.github.io/apidocs/futures/en/#partial-book-depth-streams

  2. What is an efficient way of working out the spread from the realtime depth data (depthUpdate)?

2

  1. “Bids to be updated” and “Asks to be updated” are the differences with the Bids and Asks returned from previous event (same stream).

  2. What do you mean by “working out the spread”?