Unfortunately, there is no API to handle such a feature. However, you can implement an app, listen for all incoming calls, detect spam numbers and report it to reverd.com and update your spam list in the background.
To listen for incoming calls, you can use RingCentral push notification API with the account/extension presence events or the telephony session events.
Let me know if you have further questions.
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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