Originally published on danholloran.me
If you've ever built a dApp and had a user complain that "your site only shows MetaMask even though I have Coinbase Wallet installed," you've run headfirst into the window.ethereum problem. For years, every wallet browser extension raced to claim the same global, and whichever one loaded last won. The result was a constant arms race between wallet vendors and a genuinely terrible user experience.
EIP-6963 fixed that — and wagmi v2 makes the fix trivially easy to adopt. If you're still rolling your own wallet detection or using a library that hasn't caught up yet, this post is for you.
The window.ethereum Problem and How EIP-6963 Solves It
The original EIP-1193 standard gave wallets a single attachment point: window.ethereum. One slot, many wallets, inevitable collisions. MetaMask and Coinbase Wallet both inject themselves there; whoever ran last overwrites the other.
