# SanityRates
{% hint style="warning" %}
You are referring to the **`Legacy`** version of KyberSwap docs.
For the most updated information, please refer to:
* [**`Classic`**](https://github.com/KyberNetwork/kyberswap-documentation/blob/main/reference/legacy/api-abi/misc-contracts/broken-reference/README.md)
* [**`Elastic`**](/reference/legacy/kyberswap-elastic.md)
* [**`Limit Order`**](/kyberswap-solutions/limit-order.md)
* [**`Aggregator`**](/kyberswap-solutions/kyberswap-aggregator.md)
{% endhint %}
## contract SanityRates
is [SanityRatesInterface](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityratesinterface.md), [Withdrawable](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-withdrawable.md), Utils\ imports ERC20Interface, [Withdrawable](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-withdrawable.md), Utils, [SanityRatesInterface](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityratesinterface.md)
*Source*: [SanityRates.sol](https://github.com/KyberNetwork/smart-contracts/blob/master/contracts/SanityRates.sol)
The SanityRates contract's role is provide a safeguard for reserves whereby trades are disabled in the event exchange rates fall below the lower limit or rise above the upper limit of the sanity rates.
***
### INDEX[](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityrates#index)
\
### REFERENCE[](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityrates#reference)
#### Functions[](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityrates#functions)
#### `SanityRates`[](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityrates#sanityrates)
Contract constructor. Note that constructor methods are called exactly once during contract instantiation and cannot be called again.
***
function **SanityRates**(address \_admin) public | Parameter | Type | Description | | ----------|:-------:|:--------------------:| | `_admin` | address | address of the admin |\\
#### `getSanityRate`[](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityrates#getsanityrate)
Gets the sanity rate for a pair of tokens.
***
function **getSanityRate**(ERC20 src, ERC20 dest) public view returns (uint) | Parameter | Type | Description | | --------- |:-----:|:----------------------------------------:| | `src` | ERC20 | source ERC20 token contract address | | `dest` | ERC20 | destination ERC20 token contract address | **Returns:**\ The sanity rate for the pair of tokens
***
Web3 Example:
```
// DISCLAIMER: Code snippets in this guide are just examples and you
// should always do your own testing. If you have questions, visit our
// https://t.me/KyberDeveloper.
let sanityRate = await SanityRates.methods
.getSanityRate(
'0xdd974D5C2e2928deA5F71b9825b8b646686BD200', //ERC20 src: KNC token
'0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee', //ERC20 dest: ETH
)
.call();
```
\\
#### `setReasonableDiff`[](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityrates#setreasonablediff)
Set reasonable conversion rate difference in percentage (any conversion rate outside of this range is considered unreasonable).
***
function **setReasonableDiff**(ERC20\[] srcs, uint\[] diff) public | Parameter | Type | Description | | --------- |:-----:|:-----------------------------------------------:| | `srcs` | ERC20\[] | list of source ERC20 token contract addresses | | `diff` | uint\[] | list of reasonableDiffs in basis points (bps)\
`1 bps = 0.01%`\
Modifiers: [onlyAdmin](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-permissiongroups.md#onlyadmin) |
***
Web3 Example:
```
// DISCLAIMER: Code snippets in this guide are just examples and you
// should always do your own testing. If you have questions, visit our
// https://t.me/KyberDeveloper.
SanityRates.methods
.setReasonableDiff(
['0xdd974D5C2e2928deA5F71b9825b8b646686BD200'], //ERC20[] srcs: [KNC token]
[1000], //uint[] diff: 10% = 1000 bps
)
.send(
{
from: adminAddress,
},
(err, res) => {
console.log(`Err: ${err}`);
console.log(`Res: ${res}`);
},
);
```
\\
#### `setSanityRates`[](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-sanityrates#setsanityrates)
Sets the sanity rate for a list of tokens.
***
function setSanityRates(ERC20\[] srcs, uint\[] rates) public | Parameter | Type | Description | | --------- |:-------:|:---------------------------------------------:| | `srcs` | ERC20\[] | list of source ERC20 token contract addresses | | `rates` | uint\[] | list of rates in ETH wei | Modifiers: [onlyOperator](https://docs.kyberswap.com/Legacy/api-abi/misc/api_abi-permissiongroups.md#onlyoperator)
***
Web3 Example:
```
// DISCLAIMER: Code snippets in this guide are just examples and you
// should always do your own testing. If you have questions, visit our
// https://t.me/KyberDeveloper.
SanityRates.methods
.setSanityRates(
['0xdd974D5C2e2928deA5F71b9825b8b646686BD200'], //ERC20[] srcs: [KNC token]
[2000000000000000], //uint[] rates: 1 KNC = 0.002 ETH = 2000000000000000 wei
)
.send(
{
from: operatorAddress,
},
(err, res) => {
console.log(`Err: ${err}`);
console.log(`Res: ${res}`);
},
);
```
---
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