> ## Documentation Index
> Fetch the complete documentation index at: https://cobo-docs-feature-cobo-cli.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Speed up transaction

> This operation accelerates a specified transaction. 

Speeding up a transaction will trigger a Replace-By-Fee (RBF) transaction which is a new version of the original transaction. It shares the same inputs but must have a higher transaction fee to incentivize miners to prioritize its confirmation over the previous one. A transaction can be accelerated if its status is `Broadcasting`.

You can use the `address` or `included_utxos` properties in the request body to specify the address or UTXOs that will cover the transaction fee. Generally, the transaction fee is paid by the original transaction's source. If that source's balance is insufficient, the specified address or UTXOs can be used to cover the fee.

A transaction request for tracking is returned upon successful operation.

<Note>This operation only applies to transactions from MPC Wallets and Smart Contract Wallets. It does not apply to transactions on the following chains: VET, TRON, TVET, SOL, and TON.</Note>

<Info>If you speed up a transaction from a Smart Contract Wallet, two RBF transactions will be triggered, one for the transaction from the Smart Contract Wallet, and the other for the transaction from the Delegate.</Info>


<RequestExample>
  ```python Python
  import cobo_waas2
  from cobo_waas2.models.create_transfer_transaction201_response import (
      CreateTransferTransaction201Response,
  )
  from cobo_waas2.models.transaction_rbf import TransactionRbf
  from cobo_waas2.rest import ApiException
  from pprint import pprint

  # See configuration.py for a list of all supported configurations.
  configuration = cobo_waas2.Configuration(
      # Replace `<YOUR_PRIVATE_KEY>` with your private key
      api_private_key="<YOUR_PRIVATE_KEY>",
      # Select the development environment. To use the production environment, change the URL to https://api.cobo.com/v2.
      host="https://api.dev.cobo.com/v2",
  )
  # Enter a context with an instance of the API client
  with cobo_waas2.ApiClient(configuration) as api_client:
      # Create an instance of the API class
      api_instance = cobo_waas2.TransactionsApi(api_client)
      transaction_id = "f47ac10b-58cc-4372-a567-0e02b2c3d479"
      transaction_rbf = cobo_waas2.TransactionRbf()

      try:
          # Speed up transaction
          api_response = api_instance.speedup_transaction_by_id(
              transaction_id, transaction_rbf=transaction_rbf
          )
          print("The response of TransactionsApi->speedup_transaction_by_id:\n")
          pprint(api_response)
      except Exception as e:
          print(
              "Exception when calling TransactionsApi->speedup_transaction_by_id: %s\n"
              % e
          )

  ```

  ```java Java
  // Import classes:
  import com.cobo.waas2.ApiClient;
  import com.cobo.waas2.ApiException;
  import com.cobo.waas2.Configuration;
  import com.cobo.waas2.Env;
  import com.cobo.waas2.api.TransactionsApi;
  import com.cobo.waas2.model.*;

  public class Example {
    public static void main(String[] args) {
      ApiClient defaultClient = Configuration.getDefaultApiClient();
      // Select the development environment. To use the production environment, replace `Env.DEV` with
      // `Env.PROD
      defaultClient.setEnv(Env.DEV);

      // Replace `<YOUR_PRIVATE_KEY>` with your private key
      defaultClient.setPrivKey("<YOUR_PRIVATE_KEY>");
      TransactionsApi apiInstance = new TransactionsApi();
      UUID transactionId = UUID.fromString("f47ac10b-58cc-4372-a567-0e02b2c3d479");
      TransactionRbf transactionRbf = new TransactionRbf();
      try {
        CreateTransferTransaction201Response result =
            apiInstance.speedupTransactionById(transactionId, transactionRbf);
        System.out.println(result);
      } catch (ApiException e) {
        System.err.println("Exception when calling TransactionsApi#speedupTransactionById");
        System.err.println("Status code: " + e.getCode());
        System.err.println("Reason: " + e.getResponseBody());
        System.err.println("Response headers: " + e.getResponseHeaders());
        e.printStackTrace();
      }
    }
  }

  ```

  ```go Go
  package main

  import (
  	"context"
  	"fmt"
  	coboWaas2 "github.com/CoboGlobal/cobo-waas2-go-sdk/cobo_waas2"
  	"github.com/CoboGlobal/cobo-waas2-go-sdk/cobo_waas2/crypto"
  	"os"
  )

  func main() {
  	transactionId := "f47ac10b-58cc-4372-a567-0e02b2c3d479"
  	transactionRbf := *coboWaas2.NewTransactionRbf("f47ac10b-58cc-4372-a567-0e02b2c3d479", coboWaas2.TransactionRequestFee{TransactionRequestEvmEip1559Fee: coboWaas2.NewTransactionRequestEvmEip1559Fee("9000000000000", "1000000000000", coboWaas2.FeeType("Fixed"), "ETH")})

  	configuration := coboWaas2.NewConfiguration()
  	// Initialize the API client
  	apiClient := coboWaas2.NewAPIClient(configuration)
  	ctx := context.Background()

  	// Select the development environment. To use the production environment, replace coboWaas2.DevEnv with coboWaas2.ProdEnv
  	ctx = context.WithValue(ctx, coboWaas2.ContextEnv, coboWaas2.DevEnv)
  	// Replace `<YOUR_PRIVATE_KEY>` with your private key
  	ctx = context.WithValue(ctx, coboWaas2.ContextPortalSigner, crypto.Ed25519Signer{
  		Secret: "<YOUR_PRIVATE_KEY>",
  	})
  	resp, r, err := apiClient.TransactionsAPI.SpeedupTransactionById(ctx, transactionId).
  		TransactionRbf(transactionRbf).
  		Execute()
  	if err != nil {
  		fmt.Fprintf(
  			os.Stderr,
  			"Error when calling `TransactionsAPI.SpeedupTransactionById``: %v\n",
  			err,
  		)
  		fmt.Fprintf(os.Stderr, "Full HTTP response: %v\n", r)
  	}
  	// response from `SpeedupTransactionById`: CreateTransferTransaction201Response
  	fmt.Fprintf(os.Stdout, "Response from `TransactionsAPI.SpeedupTransactionById`: %v\n", resp)
  }

  ```

  ```javascript JavaScript
  const CoboWaas2 = require('@cobo/cobo-waas2');
  // Initialize the API client
  const apiClient = CoboWaas2.ApiClient.instance
  // Select the development environment. To use the production environment, replace `Env.DEV` with `Env.PROD`
  apiClient.setEnv(CoboWaas2.Env.DEV);
  // Replace `<YOUR_PRIVATE_KEY>` with your private key
  apiClient.setPrivateKey("<YOUR_PRIVATE_KEY>");
  // Call the API
  const apiInstance = new CoboWaas2.TransactionsApi();
  const transaction_id = "f47ac10b-58cc-4372-a567-0e02b2c3d479";
  const opts = {
    'TransactionRbf': new CoboWaas2.TransactionRbf()
  };
  apiInstance.speedupTransactionById(transaction_id, opts).then((data) => {
    console.log('API called successfully. Returned data: ' + data);
  }, (error) => {
    console.error(error);
  });
  ```
</RequestExample>