Bangkok Bank at least actually has quite reasonable rates for USD forex. Actually slightly better than TransferWise.
If you need to show monthly 65,000 incoming transfers, I suspect this may in fact be the cheapest way to do it, unless you get totally free international wires (some brokers like Fidelity offer this).
Most US banks charge in the $35-50 range for international wires, so $3.20 is a good deal. You could be looking at a saving of ~$500 in wire fees over 12 months.
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