12 CFR 701.26: Credit union service contracts.

A Federal credit union may act as a representative of and enter into a contractual agreement with one or more credit unions or other organizations for the purpose of sharing, utilizing, renting, leasing, purchasing, selling, and/or joint ownership of fixed assets or engaging in activities and/or services which relate to the daily operations of credit unions. Agreements must be in writing, and shall advise all parties subject to the agreement that the goods and services provided shall be subject to examination by the NCUA Board to the extent permitted by law.