Returns a transaction for depositing additional ETH to an active `0x02` validator. Deposit amount must be at least 1 ETH.

#### How to sign the compound tx
If `funding_address` is not provided, the API uses the validator's withdrawal address as the funding address by default. The transaction must be signed using the withdrawal address.

If `funding_address` is provided and it's a different address from withdrawal address, the transaction must be signed using the specified funding address.

#### signature and withdrawal\_credentials are "all zeros"
When parsing the call data of the serialized transaction, you will notice that both `signature` and `withdrawal_credentials` are all-zeros. This is normal and expected for compound transactions. [Here’s an example](https://hoodi.etherscan.io/tx/0xb843b1b649584e8348a8f10716e4dec1bd19e6689f5d4484168166ac81f6dfb8) for reference

### API Data Structure

#### network
- **Type**: string  
- **Allowed Values**: `mainnet`, `hoodi`  
- **Required**: Yes

#### amount
- **Type**: string  
- **Required**: Yes  
- **Description**: Amount to deposit in ETH

#### pubkey
- **Type**: string  
- **Required**: Yes

#### funding\_address
- **Type**: string  
- **Description**: Address funding the transaction. Defaults to withdrawal address.

### Responses

#### `201 Created Deposit`
```json
{
  "data": {
    "network": "string",
    "signing_payload": "string",
    "unsigned_transaction_serialized": "string",
    "contract_call_data": "string"
  }
}
```

#### `400 Bad Request`

#### `422 Unprocessable Content`

### Example cURL Request
```shell
curl --request POST \
     --url https://api.figment.io/ethereum/compound \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --header 'x-api-key: your-api-key-here' \
     --data '{
  "network": "mainnet"
}'
```

### Example JSON Response
```json
{
  "data": {
    "network": "string",
    "signing_payload": "string",
    "unsigned_transaction_serialized": "string",
    "contract_call_data": "string"
  }
}
```