ShipLeap Momentum does validation checks on addresses entered into the app. This information is validated against the USPS database. Here is a what each icon means
An orange "i" means that the address is correct but something is missing to make the address complete. Typically, the issue is that a suite number is missing. You can hover over the order "i" to see the exact issue.
A red "x" means that the address was not found in the USPS database.
A green check means that the address was found in the USPS database. The address is ok to use.