Agent: "For security, please say the phrase: 'My voice is my password.'"
Caller: "My voice is my password."
-> Agent calls verify_voice_identity with the spoken phrase
-> Voiceprint comparison runs (internal or external API)
Agent: "Voice identity verified successfully. How can I help you today?"

{
  "voiceBiometricsEnabled": true,
  "voiceBiometricsProvider": "internal",
  "voiceBiometricsAction": "verify",
  "voiceBiometricsEnrollPhrase": "My voice is my password",
  "voiceBiometricsConfidenceThreshold": 0.7,
  "voiceBiometricsFailAction": "end_call",
  "voiceBiometricsTransferTarget": "+14155551234"
}

Parameters:
  spoken_phrase: string (what the caller said)

Returns:
  Success: "Voice identity verified successfully (confidence: 85%). The caller is authenticated."
  Failure: "Voice verification failed (confidence: 40%, threshold: 70%). The caller could not be authenticated."

curl -X POST https://api.thinnest.ai/v1/agents \
  -H "Authorization: Bearer $THINNESTAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Secure Banking Agent",
    "model": "gpt-4o",
    "instructions": "You are a secure banking agent. Before accessing any account information, verify the caller identity using voice biometrics. Ask them to say the enrollment phrase.",
    "voiceEnabled": true,
    "transcriber": { "provider": "deepgram", "model": "nova-2-conversationalai" },
    "voice": { "provider": "deepgram", "voiceId": "aura-2-thalia-en" },
    "voiceBiometricsEnabled": true,
    "voiceBiometricsProvider": "internal",
    "voiceBiometricsAction": "verify",
    "voiceBiometricsEnrollPhrase": "My voice is my password",
    "voiceBiometricsConfidenceThreshold": 0.7,
    "voiceBiometricsFailAction": "transfer",
    "voiceBiometricsTransferTarget": "+14155551234"
  }'