In Germany the reimbursement is be 25 Euro[1] (28 USD) per day. I hope it's more i the US and other countries. [1] https://de.wikipedia.org/wiki/Haftentsch%C3%A4digung
In practice, the State makes it VERY hard to ever recover those funds. There are guys who were exonerated years ago who are still waiting to receive a single penny.