> For the complete documentation index, see [llms.txt](https://pox-chain.gitbook.io/doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pox-chain.gitbook.io/doc/token-standards/prc-20/protocol-interface.md).

# Protocol Interface

## PRC-20 contract standard

PRC-20 is a set of contract standards for the issuance of token assets. Contracts written in compliance with this standard are considered to be a PRC-20 contract. When wallets and exchanges are integrating the assets of the PRC-20 contract, they can refer to this set of standards to understand the functions and events defined by the contract, facilitating the integration process.

## Optional

Token Name

```
string public name = "PolluxRewardToken";
```

Token Abbreviation

```
string public symbol = "PRT";
```

Token Precision(Decimals)

```
uint8 public decimals = 6;
```

## Required Items

```javascript
contract PRC20 {
             function totalSupply() constant returns (uint theTotalSupply);
             function balanceOf(address _owner) constant returns (uint balance);
             function transfer(address _to, uint _value) returns (bool success);
             function transferFrom(address _from, address _to, uint _value) returns (bool success);
             function approve(address _spender, uint _value) returns (bool success);
             function allowance(address _owner, address _spender) constant returns (uint remaining);
             event Transfer(address indexed _from, address indexed _to, uint _value);
             event Approval(address indexed _owner, address indexed _spender, uint _value);
}
```

totalSupply() \
This function retrieves the total supply of the token.

balanceOf() \
This function retrieves the token balance of a specific account.

transfer() \
This function facilitates the transfer of a specified number of tokens to a designated address.

approve() \
This function authorizes a third party, such as a DAPP smart contract, to transfer tokens from the owner's account.

transferFrom() \
This function permits the third party to transfer tokens from an owner account to a recipient account, provided the owner account has been approved by the third party.

allowance() \
This function queries the remaining amount of tokens that the third party can transfer.

## Event Functions

When the token is successfully transferred, the contract will initiate a Transfer Event.

```solidity
event Transfer(address indexed _from, address indexed _to, uint256 _value);
```

When the approval() function is successfully invoked, the contract will trigger an Approval Event.

```solidity
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
```