If you can meet the minimum balance, a lot of online savings accounts offer a bonus at signup.

如果你能达到的最低余额的话，许多网上储蓄帐户有注册奖金。

youdao

Affiliate Referral Program - a bonus based on the referred affiliates sales during the first 90 days after signup.

代销商推荐方案—以推荐的代销商注册后头90天的销售为基础的奖金。

youdao

He says that he typically uses each card enough to get the associated signup bonus (like the Citi Thank You Preferred Card, Citi Forward, or Chase Freedom) and then sticks it in a box never to be used again other than for photo opps like this, I guess!

FORBES: Extreme Credit Card Collections