We have a dynamic filter by amount: a wall most be X or
higher in dollars in order to be notified. This value varies from $150,000 to
$250,000 depending on the exchange.
Another filter is the proximity of the wall placed from the top
bid/ask. A wall must be at least 5% close to the top offers in order to be
notified. Here is an example:
In order for a buy wall to get signaled, it must be above 95. So any wall that meets the minimum thresholds and is above 95 will get signaled.
For a sell wall to get signaled, it must be below 105, since anything below 105 is 5% close to the top ask (which is 100)