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Legislation to cap fees.

The European Union caps consumer card interchange fees at 0.2% for debit cards and 0.3% for credit cards

And the US already capped debit card fees back in 2010:

This is explicitly about credit card fees.

Not for all banks

Can the courts cap fees? I thought that would have to be something congress does.

Right. All the courts can do is use the high fees as evidence of monopoly.