Blacklist
Sigma lets you blacklist certain users, devices, accounts and VAS receivers
What does this do?
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Blacklisting Users: Prevent specific individuals (based on their ID’s) from making future transactions.
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Blacklisting Devices: Block transactions coming from specific devices (e.g. phones) that are linked to suspicious activity.
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Blaclisting Accounts: Stop transactions to/from particular bank or payment accounts that are associated with fraud.
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Blaklisting VAS Receivers (Value-Added Service Receivers): These might be third-party services or merchants — blocking them prevents further interaction if they’re involved in fraudulent schemes.
How to blacklist an entity
There are two ways to do blacklist an entity (device, user, account or vas receiver):
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Over API
You can call our endpoint to blacklist an entity -
Sigma Dashboard
Using our dashboard, you can also blacklist an entiry. Click on any transaction and click on action.Example:
Image shows search how to blacklist an entity on sigma dashboard