Validates a phone number and checks if it appears in any Do Not Call registries. Returns DNC status and source information if found.
Rate Limiting: This endpoint counts against your monthly request limit.
API key authentication. Provide your API key in the Authorization header:
Authorization: Bearer YOUR_API_KEY
You can also omit the "Bearer" prefix:
Authorization: YOUR_API_KEY
Phone number to check (international format recommended, e.g., +1234567890)
Successfully checked phone number
Whether the phone number is on a Do Not Call list
true
RFC3339 timestamp of when the check was performed
"2025-12-16T14:32:10.123456789Z"
The source of the DNC listing (null if not on any list)
"National Do Not Call Registry"