B2Copy is the flagship copy trading solution in the B2Broker ecosystem, and its integration with WebAPI showcases the power of a unified trading API in production. Rather than maintaining separate connectors for MT4, MT5, cTrader, and B2Trader, B2Copy speaks one language: WebAPI.
Cross-Platform Trade Copying in Practice
The core challenge in copy trading is asymmetry: a master account might run on MT4 while followers use MT5, cTrader, or B2Trader. Each platform has different order types, volume conventions, and execution models. WebAPI abstracts these differences behind a single interface.
When a master opens a position on MT4, B2Copy receives the trade via WebAPI's real-time streaming. The system normalizes volume (using the 1/100000000 standard), maps symbols across platforms, and replicates the position on follower accounts—regardless of whether they're on MT4, MT5, cTrader, or B2Trader.
Real-Time Streaming Architecture
WebAPI's gRPC-based streaming is critical for copy trading. Position and order updates flow in real time, so followers see trades within milliseconds. B2Copy subscribes to account streams and applies copy logic without polling or batch processing.
This architecture also supports partial closes, modifications, and multi-symbol portfolios. The unified data model means B2Copy's logic stays platform-agnostic; adding cTrader or B2Trader support required no changes to the core copy engine, only configuration.
Lessons for Integration Teams
B2Copy's success with WebAPI validates the abstraction approach. Developers integrating copy trading, CRM, or reporting systems can build once and support all platforms. The case study proves that unified APIs reduce maintenance burden while improving feature velocity.