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📊 ERC20 Functions: Transfer, Approve & Allowance

Master the six core functions every ERC20 token must implement

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⚙️ ERC20 Functions Explained

Every ERC20 token must implement 6 standard functions. Three modify state (cost gas), three read data (free to call).

The Required Six

➡️
transfer()
🔧 State-changing
🔄
transferFrom()
🔧 State-changing
✅
approve()
🔧 State-changing
💰
balanceOf()
👁️ Read-only
📊
totalSupply()
👁️ Read-only
🔍
allowance()
👁️ Read-only

🎯 Interactive: Function Explorer

Select a function to see its signature, description, and usage:

➡️

transfer()

transfer(address to, uint256 amount)returns: bool

Transfers tokens from your address to another address

Type
State-Changing
Gas Cost
~45,000
Example
token.transfer("0x742...", 100)

🧮 Interactive: Transfer Simulator

Simulate a token transfer:

👤
Your Wallet
0x123...abc
Balance
1000 TKN
🎯
Recipient
0x456...def
Will Receive
+100 TKN
01000