Token Approval
A permission granting a contract the right to spend a user’s tokens.
A permission granting a contract the right to spend a user’s tokens.
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Sep 2026 · نقاط الحداثة: 50%
What is Token Approval?
A permission granting a contract the right to spend a user’s tokens.
- Category
- concept
- Type
- Authority Node
- المصادر
- 1
A user calls approve(spender, amount) on the token contract. The spender can then transferFrom() up to that amount. Approvals persist until changed; many dapps request "max approval" to avoid repeat transactions. Security risk: a malicious
Approvals are the gateway to DeFi — almost every interaction requires them — but they are also a top attack surface (approval scams, malicious contracts). Managing approvals (minimum amounts, revocation) is core wallet hygiene.
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1. What Is Token Approval
Token approval is the act of granting a smart contract permission to spend a specified amount of your tokens (via approve()), enabling DeFi interactions like swaps, lending, and deposits.
2. How It Works
A user calls approve(spender, amount) on the token contract. The spender can then transferFrom() up to that amount. Approvals persist until changed; many dapps request "max approval" to avoid repeat transactions. Security risk: a malicious or compromised spender can drain the allowance — making approval auditing and revocation important.
3. Why It Matters
Approvals are the gateway to DeFi — almost every interaction requires them — but they are also a top attack surface (approval scams, malicious contracts). Managing approvals (minimum amounts, revocation) is core wallet hygiene.
4. Key Facts
- Infinite/max approvals maximize convenience, minimize safety
- Approval scams trick users into approving attackers
- Tools like revoke.cash audit and revoke allowances
- Wallet UIs increasingly warn on high-value approvals
5. Related Concepts
- allowance
- approval-scam
- token
- smart-contract-risk
Frequently Asked Questions
What is Token Approval?
A permission granting a contract the right to spend a user’s tokens.
How does Token Approval work?
Token approval is the act of granting a smart contract permission to spend a specified amount of your tokens (via approve()), enabling DeFi interactions like swaps, lending, and deposits. A user calls approve(spender, amount) on the token contract. The spender can then transferFrom() up to that amo
Why does Token Approval matter in Web3?
- approval-scam - token - smart-contract-risk