if you mean the fee for converting EUR to USD on TransferWise then 0.329% doesn't sound that bad and I doubt it could bust you unless your strategy has super low margin and you work with huge volumeIt won't work, the exchange commission will wipe out the profit margin.
Is this a proven method? Withdrawal from kraken to transferwise.Use kraken to deposit USDT and convert to EUR. Withdraw EUR from kraken to TransferWise (allowed) and convert to USD.
Etana Custody has a separate KYC, and it is very tight. Also, to be able to withdrawal larg-ish amounts (>25K USD), one needs to be verified to the highest level at Kraken. For most people these are not a problem, but might be for some.Kraken absolutely DOES usd withdrawals (it's a USA company after all) via Etana custody and their own OTC desk (100k min). Money will be sent from legit USA banks. I can only say good things about them really.