# xSolvBTC Oracle on EVM

<figure><img src="/files/zd8usTORFrIPBK1QxhrH" alt=""><figcaption></figcaption></figure>

For chains not supported by Chainlink Price Feed, we use the same method for Set Nav as on BNB Chain.

**Code URL**

{% embed url="<https://github.com/solv-finance/SolvBTC/blob/main/contracts/oracle/XSolvBTCOracle.sol>" %}

**NAV(Net Asset Value)**

```javascript
  /**
     * @notice Get the nav of xSolvBTC
     * @param erc20_ The address of the erc20 token
     * @return nav The nav of xSolvBTC
     */
    function getNav(address erc20_) external view override returns (uint256 nav);
```

{% hint style="info" %}
the parameter is the address of XSolvBTC
{% endhint %}

**Decimals of values**

```javascript
/**
     * @notice Get the decimals of the nav
     * @param erc20_ The address of the erc20 token
     * @return decimals The decimals of the nav
     */
    function navDecimals(address erc20_) external view override returns (uint8);
```

**The Latest Update Time**

```javascript
 /**
     * @notice Get the latest updated at
     * @return latestUpdatedAt The latest updated at
     */
    function latestUpdatedAt() external view returns (uint256);
```


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