Harpie RPC URL unrecognized, throws warnings

Hi MetaMask team, not sure if this is the correct repository to post this in, but couldn't find anything else.

I'm Daniel from the Harpie team (https://harpie.io), the onchain firewall backed by Dragonfly, Coinbase, OpenSea. We host an RPC that acts as email-based 2FA against hacks and scams.

We have this big warning that shows up when people are trying to onboard from MetaMask, which is affecting our onboarding conversions.

Let me know if there's a way to solve this.
Daniel

No file, test, or entry point is named in the issue. Start by tracing how the MetaMask extension identifies and warns about RPC URLs, then determine the project-approved way to recognize Harpie's RPC URL; done means the reported URL no longer produces the onboarding warning without weakening other RPC safety checks.

Written by the indexing model from the issue text.