You can use $tt2x to query the "Top Trending to Exchange" for a given tribe symbol.
Usage:
$tt2x <symbol> [limit]
For example, this will perform the analysis on PAL ...
$tt2x PAL
This means that if the top 10 trending all sold their payouts, they would change the price on the Hive Engine exchange by 0.00 %. Of course, this is not a realistic measure, in and of itself. Authors don't earn 100 % of the payout and the payout itself is not always liquid, depending on the token, for example.
But even with that in mind, the goal here is to evaluate how well the top n trending payouts would impact the order book. The default is 10, but we can try it with larger limits:
$tt2x PAL 1000
This implies that trying to sell ~$37 worth of PAL would move the order book by -14.18 %, so selling that volume of PAL would change the price from 0.035 HIVE to 0.030 HIVE, resulting in an actual yield of ~$35 along the way.
We can compare that to another token:
$tt2x LEO
Here, LEO has a similar resistance to movement, when looking at the default.
$tt2x LEO 1000
This implies that trying to sell ~$572 worth of LEO would move the order book by -95.64 %, so selling that volume of PAL would change the price from 0.264 HIVE to 0.012 HIVE, resulting in an actual yield of ~$392 along the way.
You will note that $572 to $392 is not itself a drop of 95%. I want to emphasize that this change is the price that LEO would fall after that much volume, if someone were to dump all that at once, which is probably not typical.