feat: added isMainnetOnly to isBase and isEthereum utilities coinbase…

…#1167 (coinbase#1221)

.changeset/cool-walls-dream.md

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+---
+'@coinbase/onchainkit': patch
+---
+
+- **feat**: added `isMainnetOnly` to `isBase` and `isEthereum` utilities. By @zizzamia #1167 #1221

CHANGELOG.md

@@ -4,9 +4,9 @@
 
 ### Patch Changes
 
- - **feat**: added support for `EIP-5792` (https://eips.ethereum.org/EIPS/eip-5792) in `OnchainKitProvider`. By @0xAlec #1181
- - **fix**: adjusted hover styling for the `Fund` and `Disconnect` wallet components in mobile view. By @cpcramer #1211
- - **feat** added `walletCapabilities` for atomic batching (`useWriteContracts` vs `useWriteContract`) in `Transaction` component. By @0xAlec #1214
+- **feat**: added support for `EIP-5792` (https://eips.ethereum.org/EIPS/eip-5792) in `OnchainKitProvider`. By@0xAlec #1181
+- **fix**: adjusted hover styling for the `Fund` and `Disconnect` wallet components in mobile view. By@cpcramer #1211
+- **feat** added `walletCapabilities` for atomic batching (`useWriteContracts` vs `useWriteContract`) in`Transaction` component. By @0xAlec #1214
 
 ## 0.31.3
 

site/docs/pages/config/is-ethereum.mdx

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+# `isEthereum`
+
+The `isEthereum` utility is designed to verify if the chain id is a valid Ethereum Mainnet or Ethereum Sepolia chain id.
+
+## Usage
+
+:::code-group
+
+```tsx [code]
+import { isEthereum } from '@coinbase/onchainkit';
+
+const chainId = 1;
+
+if (isEthereum({ chainId })) {
+ console.log('The chainId is Ethereum Mainnet or Ethereum Sepolia.');
+} else {
+ console.log('The chainId is not Ethereum.');
+}
+```
+
+```ts [return value]
+true;
+```
+
+:::
+
+## Returns
+
+`boolean` - Returns `true` if the chain id is Ethereum Mainnet or Ethereum Sepolia, otherwise `false`.
+
+## Parameters
+
+[`isEthereumOptions`](/config/types#isethereumoptions)