White-Label Platform for Cryptocurrency Wallets and Exchanges

Challenge

The client is developing a white-label platform for cryptocurrency wallets, crypto banking, and online exchanges, designed to be reliable, scalable, and easily integrable. This solution serves over 60 independent projects, including fintech startups and crypto exchange services. Our team focused on building a high-load internal API, creating microservices for monitoring currency rates and transactions, and enhancing fault tolerance and real-time data processing speed.

Solution

A dedicated microservice handles currency rate processing by collecting data from multiple sources and calculating an aggregated rate based on their weighted contributions. A tree-based caching system ensures instant calculation of any currency pair's value, delivering high performance and accuracy even under significant loads.

Transaction monitoring is facilitated through a real-time API that tracks activity on specified crypto addresses, monitors blockchain operations, and automatically detects anomalies such as fraud or unusual activity. The system sends notifications via the API upon identifying suspicious operations.

The platform is built on modern technologies. The backend leverages Golang and Ruby, with TimescaleDB, PostgreSQL, and S3 handling data operations. Integrations are implemented using gRPC, REST API, and WebSocket. DevOps processes rely on Docker, Kubernetes, and Gitlab CI, ensuring flexibility and automated deployment.

Results

The platform efficiently processes tens of thousands of requests per minute with event processing delays under one second. It supports over 60 fintech and crypto projects and demonstrates scalability to accommodate new token types and currencies.