Co-Creator of /chonksxyz | https://gallery.so/backseats

Smart Contract Engineer at M^0 Labs
pierrickgt.twitter
https://pierrick.turelier.com

Currently using Coinbase since Juno retired their L2 on ramps.
Weekly USDC purchase on auto pilot and then I can bridge native USDC to Arbitrum.

Moonpay has options for Optimism & Arbitrum

I think most CEXs do too

Moonpay, ramp, and coinbase are available through rainbow wallet and support optimism/arbitrum

Moonpay does really well here! They support ETH, USDC, and native tokens on a lot of popular L2s

Do checkout juno.finance 

USDC on Arbitrum, Polygon, Solana are live. More coming soon.