- TradingView for real-time crypto market data. - APIs from…

- TradingView for real-time crypto market data.
- APIs from various crypto market data providers, although most will give you volume or trade data rather than balances on exchanges directly.

For the most accurate, current figure, you might want to directly contact exchange representatives or look for reports from blockchain analytics firms that periodically generate such data. Remember, even they will provide estimates or data based on snapshots in time.