API to calculate amount of any asset they can transfer for free ...

[davidsiska-vega]

... as a consequence of trading activity.

The UI should probably show the netparam which shows how much it decays each epoch.

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probably ignore what's below.
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What do we need to cover?

• clearly the upper bound on maximum fee per transfer
• I guess the current “trading activity accrued discount”?
• for delayed transfers it should either refuse to answer (because it can’t guarantee value of netparams).
• what about recurring transfers?

From @barnabee: think we can be a bit :face_with_cowboy_hat:

• estimate only the first instance of a recurring transfer (as if it was a single transfer)
• always estimate as if the transfer happened right now
  But I think it ideally would take into account the accrued trading fee discount as well as the cap.========

[witgaw]

#2373