Abstract: A method, a computer program product, and a computer system for exchanging cloud resources between tenants. A mediator system receives from a user a request for a cloud resource, aggregates the cloud resource from one or more of the tenants, and replies the request for a cloud resource with a description of the cloud resource. The mediator system receives from the user a request for resource delegation, initiates a transaction of the cloud resource, retrieves the cloud resource from a resource pool, and determines whether the cloud resource complies with an access control list (ACL) policy. The mediator system enforces a resource acquisition, in response to determining that the cloud resource complies with the ACL policy. The mediator system the request for resource delegation with a resource delegation result.