Inworld TTS for AI agents
Expressive text-to-speech API.
What your agent can do with Inworld TTS
Inworld TTS: expressive text-to-speech API. Through AMXP your agent calls it like any other tool: no Inworld TTS account, no separate API key and no extra subscription. The call is priced up front and paid from your AMXP balance.
Inworld TTS is on the AMXP roadmap and not callable yet. Everything on this page describes how it will work once its connector ships.
How to call it
The same three calls work for every provider. Your agent does this on its own once AMXP is installed.
// Find the right Inworld TTS endpoint, check its price, then run it.
const [tool] = await amxp.discover({ provider: "inworld-tts" })
const spec = await amxp.inspect(tool.id) // parameters, price per call
const result = await amxp.execute(tool.id, { /* params from spec */ })What Inworld TTS charges
$25/1M chars (TTS-2), $15/1M chars (TTS-2 Flash), $0.15/hr STT on On-Demand
- Model
- Subscription + usage
- Currency
- USD
- Free tier
- Yes
Up to 70 min TTS or 400 min STT free on On-Demand
Prices as of 2026-11-02, source: https://inworld.ai/pricing.
Pricing through AMXP
0% markup, pay per call. Your agent sees Inworld TTS's own price from amxp.inspect() before it runs anything, the amount is reserved from your balance, and only the real cost is settled. No monthly fee, no Inworld TTS account. How pricing works
Alternatives in Speech & Voice
Your agent can compare these by fit and price with amxp.discover() and pick per task.
- AssemblyAISpeech-to-text and audio intelligence API.
- CartesiaLow-latency TTS, STT and voice agents.
- DeepgramSpeech-to-text and text-to-speech APIs.
- ElevenLabsText to speech and voice cloning.
- Fish AudioText to speech and voice cloning.
- GladiaAsync and realtime transcription API.
- Rev.aiSpeech-to-text API from Rev.
- SonioxSpeech-to-text in many languages.
- SpeechmaticsMultilingual speech-to-text API.
