17 C.F.R. § 38.151 – Access requirements.

(a) Jurisdiction. Prior to granting any member or market participant access to its markets, a designated contract market must require that the member or market participant consent to its jurisdiction.
(b) Impartial access by members, persons with trading privileges and independent software vendors. A designated contract market must provide its members, persons with trading privileges, and independent software vendors with impartial access to its markets and services, including:
1. (1) Access criteria that are impartial, transparent, and applied in a non-discriminatory manner; and
2. (2) Comparable fee structures for members, persons with trading privileges and independent software vendors receiving equal access to, or services from, the designated contract market.
(c) Limitations on access. A designated contract market must establish and impartially enforce rules governing denials, suspensions, and revocations of a member's and a person with trading privileges' access privileges to the designated contract market, including when such actions are part of a disciplinary or emergency action by the designated contract market.