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ERC-20 Approvals Explained: Check, Reduce and Revoke Token Allowances Safely

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Wallets & Self-Custody beginner 6 min read $0.01 Updated 2026-10-19

How ERC-20 approvals work and how to manage risk: approve vs transfer, unlimited allowances, checking allowance on chain, revoking with explorer tools, Permit and Permit2 signatures, what a drainer request looks like, and a routine for wallet hygiene.

Unlimited token approvals let a contract move your tokens later. Learn how to read allowances, set exact amounts, revoke old ones, and spot approval-drain scams before you sign.

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