Finally SEI Airdrop is here 

Sei claim Link

https://app.sei.io/

Can’t open now, wait till the Public Mainnet launch.(Around 12 PM UTC)

How to claim it:

Create a Sei Wallet such as Compass then Import your Keplr wallet to that or add Sei chain to your Keplr Via link Below

https://chains.keplr.app/

Buy 1$ approx of one of this tokens (Ethereum: USDC, ETH, WBTC,/ Arbitrum: USDC.e (arbUSDC),/ Polygon: USDC (maticUSDC),/ Optimism: USDC (opUSDC),/ Solana: USDC (solUSDC),/ BNB: USDT (bnbUSDT)) and Bridge It To Sei network Via
https://portalbridge.com/#/transfer

Claim your airdrop

More info: https://blog.sei.io/the-sei-airdrop/