Find and revoke old unlimited token approvals
Intermediate12h1–2
ViemWagmiNext.js
17/20Signature Request Decoder
Explain what an off-chain signature request actually allows.
Intermediate12h1 person17/20 fit
Build Signature Request Decoder for wallet users and developers in ~12h with 1 person. Stack: Viem + LLM + Next.js.
Why it wins: Fills a dangerous gap in wallet UX.
Build flow
01 · Problem
Phishing sites trick users into signing permits that give away tokens.
02 · Solution
Parse typed-data signature requests, decode known permit and order formats and explain risks in plain language.
03 · Build
- 1Parse requests
- 2Match known schemas
- 3Explain
- 4Package as extension
04 · Demo
Paste a permit request and see 'this allows spending all your tokens'.
MVP checklist
- Typed data parsing
- Known formats
- Risk explanation
- Browser extension
Tech stack
| Tech | Role | |
|---|---|---|
| Viem | Ethereum client | Chain |
| LLM | Language model | AI |
| Next.js | Frontend + API routes | Web |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
Related ideas
More Web3Show signers what a pending multisig transaction will really do
Intermediate16h1–2ViemNext.jsLLM17/20See exactly which tokens leave your wallet before you sign
Advanced24h2–3FoundryViemNext.js17/20