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If an RPC is up but stale, should you switch to another one? If the primary RPC is down, try the backup. That part is easy enough. What Iβm less sure about is when the primary is still responding, but itβs a few blocks behind. A few months ago I open-sourced rcpx, a small Go library for Ethereum RPC failover, and posted it here for feedback. You give it a primary RPC plus backups, plug it into a normal go-ethereum client, and it tries the next one when a request fails. One thing people pointed out was observability. If a request fails over and eventually succeeds, you still want to know which RPC actually served it. I added an attempt hook for that.