A search for "minimum withdrawal amount" comes down to adding up costs. The price of moving money in and out of a casino is rarely one number. A fee can come from the operator, the payment method or the bank, and a currency conversion can hide inside an exchange rate that looks close to the market one. Laying the parts out before the first deposit gives the real cost of every payment.
Minimum amounts turn small balances into a cost of their own. A withdrawal minimum above the money left in the account keeps that money in play, and a deposit minimum set higher for some methods pushes players toward a larger first payment. Some casinos also charge an inactivity fee on accounts left untouched for months, which slowly drains a forgotten balance. Both limits are printed on the banking page, usually in a table by method.
Operator fees usually attach to withdrawals. Some sites charge a flat amount for each payout, others a percentage, and many waive the fee for one or two withdrawals a month and charge for the rest. A few charge for withdrawing a deposit that was never played through, which is aimed at people using the casino to move money. The fee table in the payment terms lists each case, and it changes more often than the rest of the terms.
Currency conversion is the cost most often missed. When the account, the deposit method and the bank use different currencies, money can be converted twice on the way in and twice on the way out, each time at a rate that includes a margin. Holding the casino account in the same currency as the bank account removes most of it. Where that is impossible, the conversion rate on the banking page can be compared with the rate the bank quotes.
Many waive the fee for one or two withdrawals a month and charge for any further requests in the same month.
A few casinos charge for it, aiming at people who use the account to move money rather than to play.
Some charge a flat amount per payout, others a percentage, and the fee table in the payment terms lists each case.
Compare the rate shown on the casino payments page with the rate the bank quotes for the same currencies on the same day.