If you'd like to withdraw from Perennial, see this page
To deposit to Perennial, you are able to choose between two bridges. Each bridge has different speed/costs, so ensure to look at either option when deciding which one to use.
Using the Intent bridge (~30 sec)
Using Relay's intent bridge you can deposit from any of the 50+ supported chains. However, this bridge induces slippage so look at the native bridge if you are sensitive to fees.
Using the chain's Native bridge you are able to bridge ETH & USDC from BASE to Perennial. This birdge doesn't have any slippage.
Link: https://bridge.perennial.foundation/