# Tracking balance and TVL

#### Fetching User's Balance <a href="#key-features" id="key-features"></a>

To fetch user's balance within a specific pool:

```typescript
const userPoolBalance = await sdk.vaults.balanceOf(vault, pool, await signer.getAddress());const balance = await sdk.portfolio.getBalance(vault, poolId, user);
```

Wher&#x65;**:**

* **`vault`** – Address of the Yelay vault.
* **`pool`** – ID of the requested pool.

#### Retrieving TVL of a Client's Pool  <a href="#key-features" id="key-features"></a>

To fetch the Total Value Locked (TVL) of a specific pool within a Yelay vault:

```typescript
const vault = '0x1234';
const pool = 1234;
const poolsTvl = await sdk.data.getPoolTvl(vault, [pool]);
```

Where:

* **`vault`** – Address of the Yelay vault.
* **`pool`** – Array of pool IDs to calculate the total TVL

#### Getting historical TVL data for a vault and pool  <a href="#key-features" id="key-features"></a>

```typescript
// Fetch historical TVL data with various filter options
const historicalTVL = await sdk.data.getHistoricalTvl({
	vaultAddress: '0x1234...5678', // Required: The vault address to get TVL for
	poolId: 1, // Required: The specific pool ID to query
	fromTimestamp: 1641034800, // Optional: Start time in seconds (Jan 1, 2022)
	toTimestamp: 1672570800, // Optional: End time in seconds (Jan 1, 2023)
	page: 1, // Optional: Page number for pagination (starts at 1)
	pageSize: 30, // Optional: Number of records per page (max 100)
});

// Example with just the required parameters
const currentTVL = await sdk.data.getHistoricalTvl({
	vaultAddress: '0x1234...5678',
	poolId: 1,
});
```

The  method returns a paginated response with the following structure:

```json
// Example response from historicalTVL
{
  data: [
    {
      vaultAddress: "0x1234...5678",
      poolId: 1,
      createTimestamp: 1745820000,
      assets: "31000000000000"
    },
    // ... more data items
  ],
  totalItems: 11,    // Total number of items matching the query
  totalPages: 1,     // Total number of pages
  currentPage: 1,    // Current page number
  pageSize: 30       // Number of items per page
}
```