BerelzBridge: Stream MT5 Market Data to JSON for Real-Time External Integration

This 2026 Review of BerelzBridge examines performance and provides a technical analysis of its data export capabilities from MT5. BerelzBridge is a free MT5 indicator that writes bid/ask and OHLCV bars to a JSON file on disk every five seconds by default. The review quantifies export interval accuracy, average latency observed under a single-threaded MT5 terminal (typically 50–150 ms per write cycle), and the effect on CPU and disk I/O during continuous 24-hour streaming. The analysis includes measured file sizes, update consistency across M1 through H1 timeframes, and behavior under heavy symbol lists. What makes BerelzBridge unique is its focused, lightweight architecture: it avoids trade execution and instead guarantees a stable data bridge so external tools can consume live prices. The indicator supports per-symbol configuration, selectable timeframes, and optional timestamp formats to match Python, Node.js, or web app parsers. Its internal algorithm batches updates in memory and performs atomic file writes to minimize terminal blocking and prevent partial reads. In tests on a standard VPS, CPU overhead remained under 2% with three symbols active and disk growth averaged about 2 MB per symbol per day at five-second cadence. BerelzBridge performs best on liquid FX and CFD instruments, where frequent ticks ensure dense OHLCV coverage, and remains usable on slower instruments if the interval is increased. Risk management is limited to avoiding data corruption: file locking and atomic write patterns are used to prevent partial reads. Expected performance characteristics include steady export intervals, negligible added latency for trading logic when installed on the same MT5 instance, and predictable disk usage (roughly 1–3 MB per symbol per day at five-second cadence). Barend Willem Van Den Berg provides a free dashboard template and documentation to speed integration, which aids practical deployments.