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Like others said cash is for smaller places and also for tips, although you can tip in dollars too.
In Jordan, some guides are cash only.
We had a great guide in Israel, and great drivers and guides in Jordan if you need any recommendations.
We used all private drivers and guides.
Our guide for Petra was also fantastic and arranged for the guys to get us up the steep steps in Petra too, all cash.
They were happy with dollars or dinars.