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If you are having issues connecting Rabby and still have MM on the same browser, you can try this:

It's found under 'More' tab on Rabby and 'Connect Rabby as disguising as MetaMask'

I haven't yet swapped Base USDC for Leo but surely it's possible?

I was wondering if you connect your Rabby to LeoDex with Base USDC can you rely on Leodex to do all the swaps in between Base USDC and Arbitrum Leo?

I just connected with my testnet wallet to test it, would've made a swap but didn't have ETH or USDC on Base right now.