Receipt Guard

See the Base call before you sign.

Paste a Base transaction hash or raw calldata. Receipt Guard decodes common ERC-20 approvals and transfers, scores local risk heuristics, detects Builder Code markers, and gives you a shareable receipt card.

Built for the Base builder stack (wagmi/viem era, Builder Codes, pre-sign clarity).

Live idea

• Decode approve / transfer / transferFrom
• Flag unlimited approvals and native ETH value
• Detect ERC-8021-style Builder Code markers
• Demo buttons + copy-to-clipboard share receipt

Run locally

npm install
npm run build
npm run start

Dev:

npm run dev

App defaults to http://127.0.0.1:4311.

Optional:

BASE_RPC_URL=https://mainnet.base.org

Stack

• Next.js (App Router) + TypeScript + Tailwind
• viem for hex helpers and Base RPC reads

Not a full audit

Local heuristics only. Always verify the dapp origin and use a simulator for production-critical flows.

Repo

https://github.com/kutluhaneth46/receipt-guard