Before I knew it, I was able to do staking.
It looks like you need USDC in solana to buy AART. (For now, the only liquidity is AART/USDC)
https://www.orca.so/
I did a lot of research on how to get USDC at a reasonable price, and I found some good ways.

1.Buy JPYC in yen. (in polygon network).
https://app.jpyc.jp/

2.Swap USDC with JPYC.

3.Use allbridge to bridge USDC from polygon to solana. (apUSDC)
https://app.allbridge.io/bridge?from=POL&to=SOL&asset=USDC

4.saber to swap apUSDC to USDC.(apUSDC)
https://app.saber.so/#/swap

5.Swap USDC to AART with orca

6.solsea for staking!

2022/01/14 11:14 Added procedure in saber for apUSDC when bridging with Allbridge

That's all. Thank you very much for your cooperation.

via:https://medium.com/@djhugu/solsea%E3%81%A7aart%E3%82%92%E3%82%B9%E3%83%86%E3%83%BC%E3%82%AD%E3%83%B3%E3%82%B0%E3%81%99%E3%82%8B-c2c2ad207fbe