Key Terms:

• Entities are what you are screening
• Lists and list entries are the lists you have selected to screen against

Delta Screening is the process of only screening against list entries that are new or updated within a specified date range (i.e. Canada SEMA sanctions only added since 28 March 2024). The result is alerts are only generated for new potential matches, not existing entries that have already been dispositioned.

The process begins with a baseline screen. After entities are screened against all of your designated lists once, Castellum.AI can run subsequent screens and only flag alerts for list entries that have been updated from our various list providers.

Note: Delta Screening is only available via the API. It is not available on the platform.

How Delta Screening Works

1. Castellum.AI’s patent-pending data process automatically checks list sources (e.g. Canada SEMA sanctions, OFAC SDN sanctions) and checks for updates.
2. Castellum.AI identifies whether an entry is new or updated:
   1. If yes, we set the last_updated field for those entries as that day/time when Castellum last updated that entry.
   2. If no, the last_updated field remains the same for unchanged entries.
3. The last_updated field is a proprietary field to Castellum.AI’s enrichments and reflects the date of recent changes captured by our data process.

How to Use Delta Screening

The list_entry endpoint includes an additional parameter for the “as_of” field. This field enables users to set a specific date and leverage Delta Screening.

Baseline Screen

1. Compose a query within the API. Include relevant List Sources and other parameters.
2. Execute screen
3. Process alerts

Delta Screen

When rescreening existing counterparties that have already been subject to a baseline screen:

1. Compose a query within the API.
2. Within the as_of parameter, enter a specific date to restrict screening to only include new or updated entries from that date onward.
   1. Date format "as_of": "2024-01-12T00:00:00Z",
   2. Example: Set an as_of date for 1/1/2024. This means that the list will only be scanned and hits will only be made if there are matching entries that have been updated since 1/1/2024.
3. To run screens weekly, ensure that the “as_of” field is updated accordingly
   1. Example: An initial weekly screen is run 1/8/2024 with the “as_of” set to 1/1/2024 to screen updates from the past week. The following week, update the “as_of” date to 1/8/2024.

Note: Delta Screening only applies to Castellum.AI’s Global Risk Data categories: Sanctions, PEPs, export controls, contract debarment, delisted, law enforcement and elevated risk. Delta Screening is not incorporated into Adverse Media or UBO screening. When using the “as_of” field, ensure that the ListSourceCategory does not include Adverse Media or UBO.

Workflow Overview