Solana is a blockchain, or a computer in the sky owned by the community. Solana has a native currency SOL to pay for transaction fees and storing data on the blockchain.
Underdog Protocol doesn’t charge anything for launching a Career Token. However, it costs a small amount of SOL (<$5) to store data about your Career Token on the blockchain.
Career Tokens are stored on the Solana blockchain, not in Underdog Protocol databases. This means that your token data is owned by you and can use any set of services that support Solana tokens.