Which L2 added USDC now?

TLDR

Starknet added native USDC support and Circles CCTP this week, confirmed by the Starknet team and Circle. See the announcement on Starknet and Circle.

1. Native USDC and CCTP are live on Starknet for DeFi, gaming, and crosschain transfers per the Starknet post.
2. USDC is now supported natively on 30 blockchains and moves across 19 via CCTP per the Circle update.

Deep Dive

1. Native USDC On Starknet

USDC and Circles Cross-Chain Transfer Protocol (CCTP) are officially live on Starknet Mainnet. This enables mint-and-burn native USDC issuance and seamless USDC movement to and from Starknet. The rollout includes early integrations with apps like AVNU and Ekubo, among others, per the Starknet announcement and Circle update.

• Starknet says native USDC and CCTP are live for users and builders on Mainnet in their post.
• Circle highlights day?one use cases (DeFi trading, gaming, payments) and crosschain movement with CCTP in their thread.

2. Why It Matters

Native USDC reduces reliance on wrapped versions and bridges, improving liquidity quality and settlement reliability. Circle notes USDCs broader footprint (30 native chains, 19 supported for CCTP), which should enhance capital mobility across ecosystems tied into Starknets zk-rollup environment per the Circle update.

• DeFi: Better collateral and 24/7 settlement for spot and derivatives on Starknet per the Circle update.
• Payments and gaming: Lower-friction on-chain payments and in?game economies using native USDC per the Circle update.

Conclusion

The L2 adding USDC now is Starknet. Native USDC plus CCTP improves settlement and crosschain flow quality on Starknet, likely strengthening DeFi markets and payment use cases there as integrations expand per the posts above.