Is Retell AI Down? How to Check Retell AI Voice API Status in 2026

Retell AI is a fast-growing platform for building AI voice agents — it powers inbound and outbound phone calls with LLM-driven conversational AI, handling everything from real-time transcription to natural-sounding voice synthesis. Teams deploying Retell for customer support, lead qualification, and appointment setting rely on it being up 24/7. When it isn't, calls fail and customers notice immediately.

Whether you're seeing call initiation failures, agents that connect but never respond, or REST API errors, this guide will help you determine: is Retell AI down for everyone, or is it just you?

How to Check if Retell AI is Down (Fastest Methods)

1. Check the Official Retell AI Status Page

Retell AI maintains an official status page at status.retellai.com. It shows live uptime for the API, telephony gateway, and regional call infrastructure. Any active incidents appear here with regular status updates.

2. Test the API Directly with cURL

A quick REST API check confirms whether Retell's control plane is reachable:

curl --request GET \
  --url 'https://api.retellai.com/list-agents' \
  --header "Authorization: Bearer $RETELL_API_KEY"

A 200 response with your agent list means the API layer is healthy. A 401 means an invalid or expired API key. A connection timeout or 503 indicates a service-level outage.

3. Search X (Twitter) for Reports

Search "Retell AI down" or "Retell AI not working" filtered by Latest. Developers building on AI voice platforms are quick to post failures on X — often before official status pages update.

4. Check the Retell AI Community

Retell AI's Discord community is a fast way to confirm widespread issues. Look for the #support or #announcements channel for live incident discussion and official Retell team responses.

5. Use API Status Check for Automated Monitoring

For production deployments, API Status Check monitors Retell AI endpoints every 30 seconds and sends instant Slack or email alerts when downtime is detected.

Why Does Retell AI Go Down?

Retell AI orchestrates multiple services to deliver real-time AI calls, creating several common failure modes:

• Upstream LLM Outages: Retell routes conversation turns through LLM providers like OpenAI and Anthropic. If your configured model provider goes down, your Retell agent stops generating responses — even when the Retell platform itself is healthy.
• WebRTC / PSTN Gateway Failures: Voice calls depend on WebRTC for browser-based calls and PSTN gateways for phone calls. Gateway saturation or regional network issues cause call drops that look like a Retell outage.
• Transcription Service Degradation: Retell's real-time speech-to-text relies on external providers. If transcription degrades, agents can't process what callers say — calls connect but the agent goes silent.
• TTS Latency Spikes: Slow text-to-speech responses cause long pauses in the conversation that sound like connection timeouts to callers.
• Concurrency Limits at Peak Hours: High-volume outbound campaigns can exhaust per-account concurrency limits, causing new calls to fail while existing ones continue.

Retell AI Troubleshooting Checklist

Retell AI API Error Codes Explained

Building a Resilient Retell AI Voice Stack

AI voice calls are synchronous and customer-facing — failures are immediately visible. Teams running Retell in production should design with upstream failures in mind:

Maintain pre-configured agents on at least one backup platform so you can redirect inbound phone numbers quickly during a Retell incident.

Conclusion: Keep Your AI Voice Agents Running 24/7

Retell AI powers phone calls that customers expect to work every time. The teams that handle outages best are monitoring proactively and have fallback models pre-configured before incidents occur.