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# Introduction

The TRON network has a variety of API calls to allow users to interact with the blockchain. These API calls can be found in the <a href="https://developers.tron.network/v3.0/reference" target="_blank">API reference page</a>, which lists API calls from Full Node, Solidity Node, and TronWeb. While some of the API calls serve as stand-alone requests to get individual pieces of information, there are also many API calls which modify the user TRX wallet, resulting in a need to sign and broadcast the transaction. This guide walks the user through a TRX Balance Freezing example to show the API signature and broadcast process flow.

# Freeze Balance Example

One of the most commonly used APIs is the `/wallet/freezebalance` call. This API call freezes the TRX balance within a user-specified wallet address, and provides either bandwidth OR energy and TRON Power (voting rights) to the wallet owner. This API call takes in the four input parameters of `owner_address`, `frozen_balance`, `frozen_duration`, and `resource`:

  • `owner_address` is the TRX wallet's address in string format.

  • `frozen_balance` is the amount of TRX frozen in denominations of Sun, in integer format.

  • `frozen_duration` is the duration in days to be frozen, in integer format.

  • `resource` is the type of resource freezing for. This can be either `ENERGY` or `BANDWIDTH`, in string format.<br>

  1. **Make a Transaction**: Freeze balance by making the API call to get the JSON data:

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Below is the sample JSON output. It lists the various attributes associated with the Freeze Balance transaction. This JSON output will be used to sign the transaction. 


  1. **Sign the Transaction**: The `/wallet/gettransactionsign` API call takes in two parameters. One is the `transaction` parameters, which takes in the JSON output from the previous step. The other is the `privateKey` parameter, which requires the private key associated with the frozen TRX address to sign the transaction. 
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Below is the sample JSON output, with the signature ID:

  1. **Broadcast Transaction**: The `/wallet/broadcasttransaction` API call takes in one parameter, which is the JSON output data from signing the transaction. 
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Below is the sample JSON Output, confirming successful transaction broadcast.