Murf API Error 403, 402 or 429

How to fix it

// try these in order, the most common fix is first

1. FIX 1Check the API key

   Copy steps
   1. 01Send the key in the 'api-key' header
   2. 02Treat 403 and WebSocket close 1008 as auth failures
   Did this fix it? Yes No

2. FIX 2Top up or upgrade quota

   1. 01On 402, add balance or upgrade in the Murf API dashboard
   Did this fix it? Yes No

3. FIX 3Respect rate and concurrency limits

   Copy steps
   1. 01On 429 wait for Retry-After and cap in-flight requests
   2. 02Close finished WebSocket contexts with {"end": true}
   Did this fix it? Yes No

4. FIX 4Validate request fields

   Copy steps
   1. 01Check voiceId against GET /v1/speech/voices
   2. 02Check model, format and sampleRate values
   Did this fix it? Yes No

5. FIX 5Retry server errors with backoff

   Copy steps
   1. 01Retry 500/503 with exponential backoff
   2. 02Fall back to global.api.murf.ai; send the trace_id to support if it repeats
   Did this fix it? Yes No

Symptoms

API calls to /v1/speech/generate or /stream fail with 400, 402, 403, 408, 429, 500 or 503; WebSocket closes with 1008 or 4029.

Why it happens

• C-01Invalid or expired API key (403 / WebSocket 1008)
• C-02Quota exhausted or subscription expired (402)
• C-03Too many concurrent requests or contexts (429 / 4029)
• C-04Invalid voiceId, model, format or sampleRate (400)
• C-05Server saturation (500/503)

// this guide also covers

• murf api 403
• murf api error
• murf api 429
• murf api not working

The same problem in other apps

All not loading, error messages & connection guides →

• ElevenLabs Unusual Activity Detected Error (ElevenLabs)

Other Murf AI errors

• Murf AI Failed to Synthesize Error
• How to Cancel Murf AI Subscription
• Murf AI Not Letting Me Download After Buying a Plan
• Murf AI Export Failed or Silent Audio File
• Murf AI YouTube Copyright Claim (Content ID)
• Murf AI Mispronouncing Words
• Murf AI Payment Failed or Card Declined
• Murf AI Charged Twice in One Month