Explain what an off-chain signature request actually allows
Intermediate12h1
ViemLLMNext.js
17/20Token Approval Revoker
Find and revoke old unlimited token approvals.
Intermediate12h1–2 people17/20 fit
Build Token Approval Revoker for wallet users in ~12h with 1–2 people. Stack: Viem + Wagmi + Next.js.
Why it wins: Practical security tool.
Build flow
01 · Problem
Forgotten approvals let compromised contracts drain wallets.
02 · Solution
Scan approval events, list spenders with risk labels and let users revoke in one click.
03 · Build
- 1Read approval logs
- 2Label spenders
- 3Build revoke flow
- 4Alert on new approvals
04 · Demo
Revoke a risky approval on testnet.
MVP checklist
- Approval scan
- Risk labels
- One-click revoke
- Alerts
Tech stack
| Tech | Role | |
|---|---|---|
| Viem | Ethereum client | Chain |
| Wagmi | React wallet hooks | Chain |
| Next.js | Frontend + API routes | Web |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
Related ideas
More Web3See exactly which tokens leave your wallet before you sign
Advanced24h2–3FoundryViemNext.js17/20Learn to use a wallet safely with fake money and guided missions
Beginner10h1–2WagmiNext.jsTestnet17/20