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GET
/
v1
/
calls
/
{call_id}
Get call
curl --request GET \
  --url https://api.nixflex.com/v1/calls/{call_id}
Fetches a single call with full transcript, recording URL, and post-call analysis.

​
Request

curl https://api.nixflex.com/v1/calls/CA1234567890 \
  -H "Authorization: Bearer KEY_ID:KEY_SECRET"

​
Response

200 OK: 
{
  "call_id": "CA1234567890",
  "agent_id": "agent_125207e452f8714a",
  "direction": "inbound",
  "from_number": "+447386172392",
  "to_number": "+447446466847",
  "started_at": "2026-05-17T03:45:12Z",
  "ended_at": "2026-05-17T03:47:38Z",
  "duration_seconds": 146,
  "ended_reason": "agent_hangup",
  "voicemail_detected": false,
  "transcript": [
    {
      "role": "agent",
      "text": "Hello, Acme Dental, how can I help?",
      "timestamp_ms": 1200
    },
    {
      "role": "caller",
      "text": "Hi, I'd like to book a check-up.",
      "timestamp_ms": 3800
    }
  ],
  "recording_url": "https://storage.nixflex.com/recordings/CA1234567890.mp3",
  "call_summary": "Caller booked a check-up for Tuesday 8th March at 2pm. Confirmed contact details.",
  "caller_sentiment": "happy",
  "call_successful": true,
  "extracted_data": {
    "caller_name": "Sarah Johnson",
    "appointment_date": "2026-03-08",
    "appointment_time": "14:00"
  },
  "metadata": {},
  "cost_usd": 0.195
}

​
Field reference

FieldNotes
directioninbound or outbound
ended_reasonagent_hangup, caller_hangup, silence_timeout, max_duration, voicemail, error
transcriptOrdered turns; role is agent or caller
recording_urlPermanent URL hosted on Nixflex; original is also kept on your Twilio account
caller_sentimenthappy, neutral, frustrated
call_successfulTrue if the AI judged the goal achieved
extracted_dataObject matching the agent’s extraction_schema
metadataCustom data passed when triggering an outbound call
cost_usdTotal Nixflex charge for this call (excludes Twilio costs)

​
Errors

CodeCause
call_not_foundID doesn’t exist or belongs to another account