There are several important features to consider when building a cryptocurrency exchange software, including:

User authentication and KYC: Implementing user authentication and Know Your Customer (KYC) procedures helps to ensure that only verified users can access the platform and helps prevent fraud and money laundering.

Secure wallet integration: Integrating secure wallets for each supported cryptocurrency provides users with a safe place to store their funds and helps protect against hacking and theft.

Trading engine: Building a robust and reliable trading engine is essential for facilitating quick and efficient trades on the platform.

Order book: An order book allows users to view real-time market data and place buy and sell orders.

Payment gateway integration: Integrating multiple payment gateways enables users to deposit and withdraw funds easily and conveniently.

Multi-language support: Supporting multiple languages broadens the platform's appeal to a global audience and makes it more accessible to users who may not speak the platform's primary language.

Security features: Implementing security measures such as SSL encryption, two-factor authentication, and anti-fraud measures helps protect users' funds and personal information.

Liquidity management: Developing a liquidity management system that ensures there is adequate liquidity on the platform at all times is critical for attracting and retaining users.

Reporting and analytics tools: Providing users with reporting and analytics tools helps them make informed trading decisions and better understand their portfolio performance.

Overall, building a cryptocurrency exchange software with these important features requires expertise in software development, security, and finance, as well as a deep understanding of the needs and preferences of the target market.