> For the complete documentation index, see [llms.txt](https://docs.bancor.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bancor.network/developer-guides/data-and-events/liquidity-data/tradingliquidityupdated.md).

# TradingLiquidityUpdated()

### event TradingLiquidityUpdated()

This event is triggered by changes in the amount of available trading liquidity, including trades, deposits, and withdrawals. 

{% hint style="info" %}
This event is typically emitted twice to indicate the change in both TOKEN and BNT trade liquidity 
{% endhint %}

```javascript
event TradingLiquidityUpdated(
    bytes32 indexed contextId,
    Token indexed pool,
    Token indexed token,
    uint256 prevLiquidity,
    uint256 newLiquidity
);
```

| Parameter Name | Type    | Description                                                                               |
| -------------- | ------- | ----------------------------------------------------------------------------------------- |
| contextId      | bytes32 | Unique identifier for the specific transaction (can be used for grouping multiple events) |
| pool           | Token   | The address of the Bancor pool token (bnToken)                                            |
| token          | Token   | The address of the token                                                                  |
| prevLiquidity  | unit256 | The total number of tokens in the liquidity pool before the transaction                   |
| newLiquidity   | unit256 | The total number of tokens in the liquidity pool after the transaction                    |

### Uses

This event can be used to:

* Monitor changes in liquidity pools
* Monitor the amount of liquidity in pools

### Triggered By

This event is triggered by the following functions:

* trade()
* deposit()
* depositPermitted()
* depositFor()
* depositForPermitted()
* withdraw()