You pay gas any time you send a transaction to the Ethereum blockchain. There are several instances including:

• Wrapping ETH


• Unwrapping ETH


• Enabling a token allowance


• Filling an existing order ("taker")


• Cancelling an order


• Sending tokens or ETH from your wallet

Why Don't I Pay Gas to Create an Order?

When you create an order, you're signing your willingness to execute a trade with specific parameters (quantity, price, expiration). The order is hosted off-chain by us, so nothing is settled on the blockchain until an order is executed.