⏺ Why TRON Returns Hexadecimal Values

The TRON Virtual Machine (TVM), like the Ethereum Virtual Machine (EVM), follows the ABI (Application Binary Interface) specification for encoding return values. Integer values are returned as 256-bit unsigned integers (uint256), which are represented as 64-character hexadecimal strings.

Although this appears to be a very large number, most of the characters are simply leading zeros used to pad the value to 256 bits. The actual hexadecimal value is:

⇄ Converting the Hexadecimal Value to Decimal

To convert the hexadecimal value into a decimal integer, PHP developers should avoid using hexdec() for large blockchain integers because it cannot safely handle 256-bit values. Instead, use the GMP extension:

                        
<?php

$hex = "00000000000000000000000000000000000000000000000000000033199c048";

$decimal = gmp_strval(gmp_init($hex, 16));

echo $decimal; // Output: 13785718856
                        
                        

This number represents the token amount in its smallest divisible unit, not the user-visible token balance.

🔢 Understanding Token Decimals

Every TRC20 token defines a decimals property that specifies how many decimal places the token uses. For example:

🧮 Calculating the Actual Wallet Balance

Using the previous example:

• Hex: 000000000000000000000000000000000000000000000000000000000000033199c048
• Decimal: 13785718856

Since USDT has 6 decimals:

So the wallet actually contains:

🐘 PHP Example (BCMath)

                        
<?php

$hex = "00000000000000000000000000000000000000000000000000000033199c048";

$rawBalance = gmp_strval(gmp_init($hex, 16));

$decimals = 6;

$balance = bcdiv($rawBalance, bcpow('10', (string)$decimals), $decimals);

echo $balance; // Output: 13785.718856
                        
                        

Using BCMath ensures that precision is maintained even for very large token balances.

⚠️ Why Not Use hexdec()?

PHP's built-in hexdec() function is suitable only for values that fit within the platform's integer or floating-point limits. Since TRON smart contracts return 256-bit integers, hexdec() can overflow or lose precision when handling large balances.

🔄 The Complete Conversion Process

When retrieving a TRC20 balance from the TRON blockchain, the process is always the same:

1. Call the smart contract's balanceOf(address) function.
2. Receive a 256-bit hexadecimal string.
3. Convert the hexadecimal string to a decimal integer using GMP or another arbitrary-precision library.
4. Retrieve or know the token's decimals value.
5. Divide the decimal integer by 10^decimals.
6. Display the resulting value as the user's actual token balance.

For USDT (TRC20), this means dividing the raw integer by 1,000,000, since the token uses 6 decimal places.

📘 Conclusion

The hexadecimal values returned by TRON smart contracts are not directly human-readable balances. They are 256-bit encoded integers representing the token's smallest unit. Converting the value from hexadecimal to decimal is only the first step. To obtain the true wallet balance, the decimal value must then be adjusted according to the token's decimals setting.