Get a one-time $5 statement credit by using your enrolled Card to make a single purchase of $10 or more via Curb – The Taxi App by 8/31/2018. Download the App at gocurb.com/app.
- Enrollment limited.
- Must use enrolled Card as payment method directly with the Curb mobile app.
- Offer valid only for transactions made directly through the Curb mobile app.
- Payments made directly to the driver or outside the app are excluded.
- Valid for US transactions only.
I have never used them personally, but they are available in a lot of cities. Could be worth checking out, especially for the first ride, since you get $5 off as a sign up bonus and $5 off through this Curb Amex Offer.