Ultravox for AI agents
Speech-native realtime voice AI API.
What your agent can do with Ultravox
Ultravox: speech-native realtime voice AI API. Through AMXP your agent calls it like any other tool: no Ultravox account, no separate API key and no extra subscription. The call is priced up front and paid from your AMXP balance.
Ultravox 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 Ultravox endpoint, check its price, then run it.
const [tool] = await amxp.discover({ provider: "ultravox" })
const spec = await amxp.inspect(tool.id) // parameters, price per call
const result = await amxp.execute(tool.id, { /* params from spec */ })What Ultravox charges
$0.05 per minute
- Model
- Subscription + usage
- Currency
- USD
- Free tier
- Yes
30 free call minutes, up to 5 concurrent calls
Prices as of 2026-11-02, source: https://ultravox.ai/pricing.
Pricing through AMXP
0% markup, pay per call. Your agent sees Ultravox'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 Ultravox account. How pricing works
Alternatives in Agentic Phone
Your agent can compare these by fit and price with amxp.discover() and pick per task.
