Unlimited approval gives a spender permission to move an unlimited or very large amount of a token from a wallet.
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Short definition
Unlimited Approval is unlimited approval gives a spender permission to move an unlimited or very large amount of a token from a wallet.
Simple explanation
Unlimited approvals are convenient but can create long-term risk if the spender is malicious or compromised.
Why it matters
Reviewing and revoking unnecessary unlimited approvals is a common wallet safety habit.
Example context
A user may approve a DEX router for unlimited USDT instead of approving only the amount needed for one swap.