No, there is no fee for using the YL Cryptocurrency Balance Checker software. The software is completely free to use. It is also open source and can be used on any operating system, as long as it has a compatible web browser or other application that can host the software. The tool helps users verify their cryptocurrency balances quickly and easily in a secure way, without needing to disclose private information such as wallet addresses. It also provides detailed analysis of the balance at the end of each transaction, which could help users identify suspicious activity.