Murf TTS API + MCP vs Soniox Text-to-Speech

Murf TTS API + MCP

Falcon 2 costs 1 cent per 1,000 characters on pay as you go, with a $2 minimum purchase. Falcon 2 concurrency is 2 outside US-East on free and pay as you go, 5 on US-East.

Soniox Text-to-Speech

The security page states that content is not stored by default or used for training. Audio output is capped at two minutes per request or stream.

Murf TTS API + MCP

1. Send locale on every request, since multiNativeLocale was replaced on 2026-03-05.
2. Split text into chunks under 3,000 characters per request.
3. Use the US-East host for 5 concurrent Falcon 2 calls instead of 2.
4. Set encodedAsBase64 to get audio inline and skip the expiring download link.
5. Back off on 429 and close WebSocket contexts with end: true to free slots.

Soniox Text-to-Speech

1. Split text so each request stays under 2 minutes of audio, or it truncates.
2. Branch on error_type, not the message, and back off on limit_exceeded.
3. Use a temporary API key for browser clients.
4. Use bracketed audio tags such as [whispering] instead of SSML.
5. Pick the regional host (EU, Japan, India) that matches your data residency.