Several years ago, Project Streamline investigated the minimum requirements and reported that for grants to public charities, there are no requirements beyond verifying current tax status.
Below are several resources that explore this and other topics related to streamlining:
Ten Ways to Streamline
Reducing the Burden on Our Grantseekers and Ourselves
Why We Accept Proposals Written for Other Funders
Minimum Legal Requirements
What the Law Requires When Making Grants