Okla. Stat. tit. 60, § 674.1
A. No person who:
2. files a claim for any funds or other property, tangible or intangible, on behalf of a claimant of such funds or property, shall contract for or receive from the claimant, for services, an amount that exceeds twenty-five percent (25%) of the value of the funds or property recovered.
If the funds or property involved are mineral proceeds, the amount for services shall not include a portion of the underlying minerals or any production payment, overriding royalty, or similar payment.
Laws 1990, HB 2248, c. 301, § 1, emerg. eff. May 1, 1990.