# ContractCallBuilder

Builds a transaction that calls an entry point on a deployed smart contract.

## Import

```ts
import { ContractCallBuilder, Args, CLValue, PublicKey } from 'casper-js-sdk';
```

## Usage

```ts
const args = Args.fromMap({
  amount: CLValue.newCLUInt256('1000000000'),
  recipient: CLValue.newCLPublicKey(recipientPublicKey),
});

const transaction = new ContractCallBuilder()
  .from(senderPublicKey)
  .byHash('hash-abc123...')     // contract hash
  .entryPoint('transfer')
  .runtimeArgs(args)
  .chainName('casper')
  .payment(3_000_000_000)
  .build();

transaction.sign(privateKey);
const result = await rpcClient.putTransaction(transaction);
```

## Methods

### .from(publicKey)

- **Type:** `PublicKey` - required

### Contract targeting (choose one)

```ts
.byHash(contractHash: string)
.byPackageHash(packageHash: string, version?: number)
.byName(contractName: string)
.byPackageName(packageName: string, version?: number)
```

| Method | Description |
|---|---|
| `.byHash(hash)` | Call a specific contract by its hash |
| `.byPackageHash(hash, version?)` | Call latest (or specific version) in a package |
| `.byName(name)` | Call by named key in the caller's account |
| `.byPackageName(name, version?)` | Call by named key pointing to a package |

### .entryPoint(name)

- **Type:** `string` - required

The contract entry point to call.

### .runtimeArgs(args)

- **Type:** `Args` - optional

Arguments to pass to the entry point.

### .chainName(name)

- **Type:** `string` - required

### .payment(motes)

- **Type:** `number` - optional

## Return Value

`Transaction`

## Related

- [`SessionBuilder`](/builders/SessionBuilder)
- [`Args`](/clvalues/Args)
- [`CLValue`](/clvalues/introduction)