C.R.S. § 44-30-1511: Unlawful acts.

(1) In addition to the prohibitions in section 44-30-801, it is unlawful for:

(a) A person to charge, in connection with the placement or acceptance of a bet, a commission or fee greater than or less than that fixed by the commission;

(b) A person to accept a bet by any person under twenty-one years old;

(c) A person to accept a bet at any place or in any manner other than a place or manner authorized and specified in a sports betting license; or

(d) An internet sports betting operator to accept deposits using a credit card, either directly or indirectly, including through an account funded by a credit card, in connection with the acceptance of a sports bet.