My first month in DeFi was a blur of popups. Connect wallet. Approve USDC. Confirm swap. I treated “Approve” like terms and conditions — scroll past, click yes, get to the interesting part. Nobody told me the first popup was giving a stranger a standing order on my tokens.
Two popups, two different jobs
Connecting my wallet felt social — the site knew my address, showed my balance, said hello. Approving felt like paperwork. Same colour button. Same muscle memory.
They are not the same thing. Connect wallet is identity. Approve is permission: this contract may move this token, up to this limit, until I revoke it. The lending pool could not pull my USDC without that signature. I just did not internalise that the permission outlived the session.
I closed the tab. The approval stayed on the chain.
Why everything asks for unlimited
Most interfaces nudge you toward unlimited approval. One click now, never see the popup again for USDC on this site. Convenient when you swap every week. Terrifying when you realise what you signed.
Unlimited means: if that contract is ever exploited — or was malicious from the start — every USDC still sitting in your wallet is within reach. Not just the fifty dollars you deposited. All of it.
I had approved half a dozen farms and test protocols during learning season. Most were dead links by spring. The approvals were not dead. They were sitting on-chain like keys under a flowerpot.
The afternoon I cleaned house
A friend sent me a revoke tool — not a link in chat, a name I typed myself. The list was embarrassing. A yield farm I used once in 2024. A bridge UI I tried and abandoned. Three swap routers I did not recognise by name but had clearly trusted with max approvals.
Revoking cost gas on each one. Annoying. Cheaper than learning the hard way.
Now I default to exact amounts when the app offers it. I bookmark sites before I connect. I revoke after experiments. Boring habits — the kind that only feel clever when headlines are about another protocol drain.
I still approve tokens — DeFi does not work without it. I just read the first popup as carefully as the second. Unlimited is a loan of trust with no expiry date. I stopped handing those out to apps I would not invite back.
Approvals are not a scam. They are how the machinery works. The scam is pretending the confirm button is decoration.