All cross-border payments must be screened against sanctions lists to ensure the payments are not financing terrorism, drug trafficking or other illicit activities. Screening is the responsibility of the banks involved in the payment (specifically the Source Bank, Source Liquidity Provider, Destination Liquidity Provider and Destination Bank). Nexus does not perform screening itself, but it does provide an API that allows these banks to communicate with each other so that they can approve (or reject) the proposed payment before the payment instruction is made. The aim is to undertake sanctions screening before any funds are moved (in either the Source or Destination IPS) and to resolve any alerts or matches against the sanctions list without human intervention, wherever possible.