Intermediate
Approval Patterns & Token Permissions — Check your understanding
Understand token flows.
Developer Intermediate
6/6 — Approval Patterns & Token Permissions — Check your understanding
Checkpoint You should be able to explain to a user why infinite approvals are risky, how to revoke, and how permits differ—without jargon.
Talk is cheap. Show me the code.
Evidence You can point to tests that show front-run drains, permit validation, and revocation working. You can also show the UI states for revoke/limit.
Runbook ready You know exactly what to do and what to tell users if a spender is compromised.
Key points
- Explain a front-run approval:Drain and your mitigation (limits/permits).
- Show how permit/Permit2 reduces:Friction and what validation is required.
- Describe how your UI:Nudges toward limited approvals and exposes spender info.
- Prove your contract cannot:Misuse approvals beyond intent (tests + caps).