I want to create a website that allows users to generate an ERC-4337 compatible Ethereum wallet using just an email address. 

Is there a guide for this? Any good examples in the wild?

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That's ok. You can still transfer assets out of it.

All current methods that do this use an app-specific OAuth key to create the signer- meaning users will need to use the same app as the one they used to create the wallet to access their wallet in the future

The wallet is not universally accessible through any app that offers email login, it’s a centralized solution

Privy with their new integration of ZeroDev? 

cc: @segall

Wrote a recent tutorial that includes exactly this.

Example on base but can be done on multiple chains.

Wrote a recent tutorial that includes exactly this.

Example on base but can be done on multiple chains. 

https://www.rahatcodes.com/blog/basedaa

Without knowing your specific use case, but

Without knowing your specific use case, but https://github.com/openfort-xyz/samples/tree/main/firebase-wagmi-nextjs

You can check out Biconomy
https://docs.biconomy.io/docs/1.0/category/social-login
We use social logins and then deploy smart accounts for those addresses and enable 4337