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

# Managing Contracts

> Use these code snippet examples to add, update, remove, and verify smart contracts using the Tenderly SDK.

The [Tenderly SDK](/platform/sdk/introduction) provides a `ContractRepository` class for managing contracts associated with your Tenderly project. The `ContractRepository` allows you to add, update, and remove contracts, as well as verify them.

With the Tenderly SDK initialized, you can use the **`contracts`** namespace to access the **`ContractRepository`** instance. To manage the wallets in the same project, see [Managing Wallets](/platform/sdk/managing-wallets).

### Adding a contract

To add a new contract, use the `add` method of the **`contracts`** namespace:

```jsx title="example.jsx" showLineNumbers theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
try {
  const contractAddress = '0x742d35Cc6634C0532925a3b844Bc454e4438f44e';
  const contract = await tenderly.contracts.add(contractAddress, {
    displayName: 'MyContract',
  });

  console.log('Added contract:', addedContract);
} catch (error) {
  console.error('Error adding contract:', error);
}
```

### Updating a contract

To update an existing contract, use the **`update`** method of the **`contracts`** namespace:

```jsx title="example.jsx" showLineNumbers theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
try {
  const contractAddress = '0x742d35Cc6634C0532925a3b844Bc454e4438f44e';
  const contract = await tenderly.contracts.update(contractAddress, {
    displayName: 'My Contract',
  });
  console.log('Updated contract:', contract);
} catch (error) {
  console.error('Error updating contract:', error);
}
```

### Removing a contract

To remove a contract, use the `remove` method of the **`contracts`** namespace:

```jsx title="example.jsx" showLineNumbers theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
try {
  const contractAddress = '0x742d35Cc6634C0532925a3b844Bc454e4438f44e';
  await tenderly.contracts.remove(contractAddress);
  console.log('Contract removed successfully');
} catch (error) {
  console.error('Error removing contract:', error);
}
```

### Verifying a contract

To verify a contract, you can use **`verify`** method of the **`contracts`** namespace.

There are three examples that show the usage of `tenderly.contracts.verify` method:

* First example shows the verification of a simple `Counter` contract with no dependencies.
* Second example shows the verification of a `MyToken` contract that has multiple dependencies which are other contracts.
* Third example shows the verification of a `LibraryToken` contract that has a library dependency.

You can find these examples in the [examples folder](https://github.com/Tenderly/tenderly-sdk/tree/master/examples/contractVerification) of our `tenderly-sdk` repo along with the instructions on how to start them. Here will be shown only a `MyToken` contract with a few dependencies so you can see how to import them:

```javascript title="example.js" showLineNumbers theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
const myTokenAddress = `0x1a273A64C89CC45aBa798B1bC31B416A199Be3b3`.toLowerCase() as Web3Address;
const ROOT_FOLDER = `examples/contractVerification/withDependencies/contracts`;

const tenderly = new Tenderly({
  accessKey: process.env.TENDERLY_ACCESS_KEY || ``,
  accountName: process.env.TENDERLY_ACCOUNT_NAME || ``,
  projectName: process.env.TENDERLY_PROJECT_NAME || ``,
  network: Network.SEPOLIA,
});

const result = await tenderly.contracts.verify(myTokenAddress, {
  config: {
    mode: `public`,
  },
  contractToVerify: `${ROOT_FOLDER}/MyToken.sol:MyToken`,
  solc: {
    version: `v0.8.19`,
    sources: {
      [`${ROOT_FOLDER}/MyToken.sol`]: {
        content: readFileSync(`${ROOT_FOLDER}/MyToken.sol`, `utf8`),
      },
      [`@openzeppelin/contracts/token/ERC20/ERC20.sol`]: {
        content: readFileSync(`${ROOT_FOLDER}/ERC20.sol`, `utf8`),
      },
      [`@openzeppelin/contracts/token/ERC20/IERC20.sol`]: {
        content: readFileSync(`${ROOT_FOLDER}/IERC20.sol`, `utf8`),
      },
      [`@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol`]: {
        content: readFileSync(`${ROOT_FOLDER}/IERC20Metadata.sol`, `utf8`),
      },
      [`@openzeppelin/contracts/utils/Context.sol`]: {
        content: readFileSync(`${ROOT_FOLDER}/Context.sol`, `utf8`),
      },
    },
    settings: {
      optimizer: {
        enabled: true,
        runs: 200,
      },
    },
  },
});

console.log(`Result:`, result);
```