Get USDC for real.

Lumina runs on Base mainnet (chain 8453). The protocol settles in Circle’s canonical USDC at 0x833589f…0x02913. Acquire USDC via Coinbase, a CEX withdrawal to Base, an L2-bridge from Ethereum mainnet, or by swapping on Uniswap on Base. The testnet faucet that used to live here is retired for mainnet and only available in preview builds under /sandbox/*.