Although any player can enter orbit around an asteroid, the asteroid surface is accessed via Spaceports which must be built by ships capable of landing on the undeveloped surface of asteroids. During Exploitation, this role is filled by the Light Transport ship. Once Spaceports are present, the Spaceports themselves can be set to allow all parties, allow only the owner, or can include a whitelist to restrict access to specific addresses. Spaceport access will be evaluated at the initiation of each journey allowing those who are already in flight to land even if their access had subsequently been barred.
Asteroid owners are able to create leases for any or all of their lots by setting several standard parameters. Additionally, leases can include a whitelist which allows lots to be restricted to a specific set of addresses. Leased lots come with no explicit limitations, but can include implicit restrictions communicated by the asteroid owner which may result in non-renewal of lease terms. Leases may also be modified with the agreement of both parties.