How a Crypto Exchange Scaled Through 20x Surges in Bull Runs

Introduction

A cryptocurrency trading platform launched in 2019 with a simple goal: make crypto trading accessible to everyone, with no technical expertise required. “We’ve often said our app should work so easily that even someone’s grandmother could buy crypto,” said its Software Development Manager. That approach quickly attracted over 400,000 active users.

"Our app’s simplicity is its strength, but it depends on infrastructure that can handle volatility and maintain a great user experience."

- Software Development Manager

The Challenge: Scaling Through 20x Bull Runs

Activity on the platform could surge 20x during bull runs, and crypto traders have no tolerance for outages. The platform needed to solve four problems at once:

1. Scalability under pressure

   A 20x surge stressed the system, and processing delays put user satisfaction and retention at risk.

   
   

2. Real-time transaction speed

   Delays in deposits or withdrawals were unacceptable in a market where seconds matter.

   
   

3. Security and compliance

   Regulations like DORA and MiCA required secure, reliable processes for user verification and data handling.

   
   

4. Resilience and uptime

   Crypto never sleeps, and neither can a trading platform. “If we’re not available, or a coin isn’t tradable, users will simply go elsewhere,” the team said.

The existing architecture struggled to keep up.

The Solution: An Event-Sourced Crypto Exchange Architecture

The team chose event sourcing and CQRS (Command Query Responsibility Segregation) as its architectural patterns, and used Axon Framework and Axon Server to implement them quickly. The result was a crypto exchange architecture that keeps up with surges in activity, whatever the market does.

The Results

Technical Impact

1. Scalability

   The platform handled a 20x increase in traffic during peak periods without interrupting users.

   
   

2. Speed

   Real-time transaction processing meant users no longer waited to see balances or trade confirmations.

   
   

3. Resilience

   High availability through bull and bear markets kept user trust high and churn low.

   
   

4. Faster development

   Developers focused on core features instead of building custom infrastructure.

   
   

“Thanks to Axoniq, we were able to quickly go to market with a reliable solution. Its out-of-the-box support saved us significant time and effort, allowing us to focus on delivering value to our users.”

Real-World Impact

Users got faster, smoother transactions and uninterrupted access regardless of market conditions, and features like lending and staking became simple to use. Today, 750,000 users trade across 125 coins on the platform, up from 400,000 in its first wave of growth.

The Role of Axoniq

Out-of-the-box event sourcing capabilities saved the team months of development time, the tools fit into its existing architecture, and Axoniq provided ongoing guidance and training.

"Other companies spend months building what Axoniq provides out of the box. Axoniq’s support has been invaluable in helping us focus on what matters: delivering value to our users."

- Software Development Manager

Looking Ahead

Next, the platform plans to close the crypto ecosystem loop, letting users not only trade and earn but also make everyday payments with their assets. The team also wants to refine its use of Domain-Driven Design and reduce complexity in non-core domains.

"Our goal is to remain at the forefront of innovation while keeping things simple and accessible for everyone,” the team shared.

See how Axoniq supports trading and other real-time financial systems, or talk to a solution architect.