S.C. Code Ann. § 38-90-40
(A) The director may not issue a license to a pure captive insurance company, sponsored captive insurance company, association captive insurance company incorporated as a stock insurer, or industrial insured captive insurance company incorporated as a stock insurer unless the company possesses and thereafter maintains unimpaired paid-in capital of:
(4) in the case of a sponsored captive insurance company, not less than five hundred thousand dollars.
The capital may be in the form of cash or an irrevocable letter of credit issued by a bank chartered by this State or a member bank of the Federal Reserve System and approved by the director.