The funding wallet pays the blockchain fees that your application consumes.
Most blockchains require fees to execute an action on the chain. Some examples of these transaction fees are:
- EVM chains (such as ETH & Polygon) use gas to execute transactions.
- EOS based chains require resources (CPU, NET, RAM, etc.) to create accounts.
- Algorand requires a minimum balance to activate an account.
Your ORE Application funding wallet is specific to the blockchain that your application runs on. Therefor, an EOS based application will need an EOS funding account, and so forth.