> ## Documentation Index
> Fetch the complete documentation index at: https://docs.exponent.finance/llms.txt
> Use this file to discover all available pages before exploring further.

# Get Exchange Rate

> Read vault properties including SY exchange rate and maturity

The `Vault` class exposes several getter properties for reading market state after loading. No additional RPC calls are required — these read from the locally loaded vault state.

## Usage

```typescript theme={null}
import { Vault, LOCAL_ENV } from "@exponent-labs/exponent-sdk";
import { Connection, PublicKey } from "@solana/web3.js";

const connection = new Connection("https://api.mainnet-beta.solana.com");
const vault = await Vault.load(LOCAL_ENV, connection, vaultAddress);

// SY exchange rate
console.log("Exchange rate:", vault.currentSyExchangeRate);

// Maturity info
console.log("Expiration timestamp:", vault.expirationTimestamp);
console.log("Expiration date:", vault.expirationDate);

// Token mints
console.log("PT mint:", vault.mintPt.toBase58());
console.log("YT mint:", vault.mintYt.toBase58());
console.log("SY mint:", vault.mintSy.toBase58());

// SY balance held in the vault
console.log("SY balance:", vault.syBalance);
```

## Available Properties

| Property                | Type        | Description                                         |
| ----------------------- | ----------- | --------------------------------------------------- |
| `currentSyExchangeRate` | `number`    | Current SY to underlying exchange rate              |
| `expirationTimestamp`   | `number`    | UNIX timestamp (seconds) at which the vault expires |
| `expirationDate`        | `Date`      | JavaScript `Date` at which the vault expires        |
| `mintPt`                | `PublicKey` | PT token mint address                               |
| `mintYt`                | `PublicKey` | YT token mint address                               |
| `mintSy`                | `PublicKey` | SY token mint address                               |
| `syBalance`             | `bigint`    | Total SY balance held in the vault's escrow         |
| `authority`             | `PublicKey` | Vault authority PDA                                 |
| `escrowSy`              | `PublicKey` | SY escrow token account                             |
| `escrowYt`              | `PublicKey` | YT escrow token account                             |
| `addressLookupTable`    | `PublicKey` | Address lookup table for the vault                  |

## Refreshing State

To fetch the latest onchain state, call `reload`:

```typescript theme={null}
await vault.reload(connection);
console.log("Updated rate:", vault.currentSyExchangeRate);
```