How much fee once sender in counter wallet

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The fee goes to Bitcoin miners so there’s a limit to how low the transaction fee can go.

As user, you cannot set it lower (it is set by system admin, above the minimum).
You could set it to even lower, but then some transactions might take hours to complete.

How to multiple send addres in counterwallet and reduce fee

This is maybe not the answer you’re looking for but I find Loon’s tools useful. In send_asset.html change var transfee = 0.0001 to var transfee = 0.00001. This reduces the fee by a factor of 10x (to about 0.3 cents per send. For sending to multiple addresses, you’ll need to make one transaction per receiver. If you know some programming you can try to add an iteratetion to Loon’s functions. It may work, though I’ve never tried.