Token approval
Approvals are one of the most important and misunderstood wallet permissions. Users need to know what they are granting, for how long, and what the blast radius can be if something goes wrong.
Three things to remember before you approve
This page should change one behavior immediately: you stop treating approval like a boring pre-swap click and start reading it as future spending authority.
Approval is a permission
It gives a contract authority to spend tokens on your behalf. It is not just a confirmation that lets the screen move forward.
Unlimited saves clicks, not risk
The convenience is real, but so is the extra blast radius if the contract, route, or signing flow turns out worse than you thought.
Exact is the cleaner default
If trust is limited, reuse is low, or the token is unfamiliar, smaller permission scope is usually the better beginner move.
Exact vs unlimited in plain English
This is the decision most users actually need help with. Make the tradeoff legible first, then decide what level of convenience is worth the permission you leave behind.
Exact approval
Best when you want the current swap to work without leaving a broader standing permission behind.
Unlimited approval
Defensible only when trust is real, reuse is real, and you are willing to manage the extra permission afterwards.
See it in product
These are the three fastest anchors for live use: where the term first appears, what to treat as the warning sign, and which rule should change your next move.
Use the term in context
Work through the main concept first, then move into applied judgment and next actions.
How approvals go wrong
Approvals feel boring because they happen before the trade. That is exactly why users ignore them and give away more authority than they intended.
Exact versus unlimited in plain English
Most users should understand this one decision before they ever touch a DEX more than once.
What actually happened
These are public cases and repeated real-world patterns turned into teachable stories. Use them to see how small shortcuts become expensive outcomes in real product flows.
A protocol broke later, but the wallet risk was planted earlier
In July 2024, LI.FI disclosed that roughly $11.6 million was drained from 153 wallets after a smart-contract exploit. The detail that matters most for Academy is that affected wallets had given broad infinite approvals beforehand.
One real-world failure usually teaches faster than ten abstract warnings.
Unlimited approval felt like a harmless convenience choice tied to one earlier workflow, not a standing authority that could stay dangerous later.
An approval prompt asking for broad token-spending scope beyond the immediate trade. In product terms, this is where 'unlimited' or wide allowance should feel like a risk decision, not just the easy default.
These are the exact product moments where this kind of mistake usually first looks harmless.
Approval scope decides how large the blast radius stays after today's trade is over. That is why exact versus unlimited approval is a real risk decision, not a cosmetic UX choice.
Use exact approval when trust or reuse is limited, and treat any unlimited approval as a choice that requires later review or cleanup.
Carry this into live execution
Before you sign or confirm
This section should help in the moment of risk. Keep one question in mind: what should I check right now before giving authority or sending the route forward?
Before you approve
Decision flow
Do not use this like a reading section. Use it as the order of operations when the screen is asking for authority or final confirmation.
How to think through it
Read the approval as future authority
The approval is not just part of this swap. It is permission that can stay behind after the current action is over.
Pick scope based on trust, not convenience alone
Exact approval is usually cleaner when the token, route, or protocol is not something you plan to reuse often.
Treat cleanup as part of the workflow
If you choose unlimited approval for speed, the matching habit is reviewing or revoking it when the position or protocol is no longer active.
Signals to notice
Easy does not mean low-risk. It usually means you are leaving future permission behind.
Brand comfort is not contract verification. The permission still belongs to the actual spender on the prompt.
That is a strong reason to avoid leaving a broad approval live.
Decision rules
Common mistakes
Short scenarios
Use quick situations like these to test whether the concept would hold up in a real product flow.
New token, unfamiliar contract
You already approved months ago
Keep building the lesson
Once the core lesson is clear, use these paths to widen the mental model or go deeper where the concept matters most.
Related paths
Once the core lesson is clear, use these paths to widen the mental model or go deeper where the concept matters most.