bayes.markets holds no money. Your account and the wallet below both belong to you - this site cannot sign for either without the permission you granted, and it never sees your keys.
There is nothing to take out until we know whose account to look at. Go to your account to sign in.
Everything in your account goes to the wallet you signed in with, as USDC on Polygon. There is no other destination - this page has no field for one, and the address is read off your account rather than typed.
Your tradeable balance is pUSD, which only Polymarket uses. It is turned back into USDC in the same transaction, at the market rate - normally within a cent or two, and never below the guaranteed figure the transaction itself enforces.
Money that has left your Polymarket account sits in the wallet you signed in with. From here it can go to any address on Polygon - an exchange, a hardware wallet, somebody else.
Check the address character by character. A transfer on Polygon cannot be reversed and cannot be cancelled. If it goes to the wrong address the money is gone, and nobody - not us, not Polygon - can bring it back. Send a small amount first.
Polygon only. The same address on another chain is a different place. If you are sending to an exchange, use the deposit address it gives you for USDC on Polygon and nothing else.
You pay no fee and need no POL - bayes.markets pays what Polygon charges to move it. You authorise the exact amount and the exact address, and that authorisation cannot be changed into any other transfer.