✅ You Understand ERC20 Tokens
Create, deploy, and interact with fungible tokens on Ethereum
Your Progress
0 / 5 completed🎯 Key Takeaways
Congratulations! You've completed the ERC20 Demo module. Let's review what you've learned.
📚 Summary
📜
ERC20 Standard
- •Defines 6 required functions and 2 events
- •Ensures interoperability across Ethereum ecosystem
- •Most widely adopted token standard
- •Foundation for DeFi protocols
🔧
Key Functions
- •transfer/transferFrom for moving tokens
- •approve/allowance for delegated spending
- •balanceOf/totalSupply for read operations
- •State-changing functions cost gas
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Real-World Use
- •Stablecoins (USDC, DAI) for payments
- •Governance tokens (UNI) for protocol control
- •Utility tokens (LINK) for network services
- •Billions of dollars in daily volume
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Deployment
- •Use audited code (OpenZeppelin)
- •Test extensively on testnet first
- •Parameters are immutable after deployment
- •Get security audit before mainnet launch
🧠 Interactive: Knowledge Quiz
Test your understanding of ERC20 tokens:
1. What is the standard number of decimals for an ERC20 token?
2. Which function allows spending tokens on behalf of another address?
3. What is the approximate gas cost for deploying an ERC20 token?
4. Which of these is NOT a required ERC20 function?
5. What happens if you deploy a buggy token to mainnet?
📖 Quick Reference
| Function | Purpose | Type |
|---|---|---|
| transfer() | Send tokens to another address | Write |
| transferFrom() | Move tokens on behalf of owner | Write |
| approve() | Grant spending allowance | Write |
| balanceOf() | Check token balance | Read |
| totalSupply() | Get total token supply | Read |
| allowance() | Check spending allowance | Read |