Currently CAPE is deployed on the Arbitrum Goerli testnet. You will need to have ETH on the Arbitrum Goerli testnet (also known as AGOR) to interact with the CAPE contract. In practice, this means that you first need to get some ether on the Goerli testnet and then bridge those ethers to Arbitrum Goerli.
1. You can get Goerli ethers at the following faucets: