[Trading Strategy protocol](https://tradingstrategy.ai/) provides [historical APIs](https://tradingstrategy.ai/trading-view/backtesting) and [real time APIs](https://tradingstrategy.ai/api/explorer/) for tracking liquidity. 
Binance Smart Chain will be added soon.

[See documentation on liquidity tracking](https://tradingstrategy.ai/docs/programming/api/liquidity.html).