SPEECH TRANSLATION API

Speech translation API: transcribe, speak and translate every call.

Add speech-to-text, text-to-speech and live call translation to your apps by API. Resell the speech AI platform under your logo, in 30+ languages.

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  • Live and batch transcription
  • Real-time translation in 30+ languages
POST/2026-01/calls/{id}/translate· en to es: live
  1. Speech inES · live audio
  2. Transcriptspeaker labels + timestamps

    Caller00:08¿Puedo cambiar la fecha de mi factura?

  3. TranslateES → EN · 30+ languages

    ENCan I change my billing date?

  4. Speech outnatural voice · streaming
    Voice · Aria
01Why teams build here

Why use a speech translation API

Capture every word, give your apps a natural voice, and let people talk across languages, all through one API.

01

Every word captured

Send live audio or recordings and get fast transcripts with speaker labels and word timestamps, seconds after each call ends.

  • AgentThanks for calling, how can I help?00:02
  • CallerI have a question about my invoice.00:06
  • AgentOf course, let me pull that up.00:10
02

Voices that sound natural

Text-to-speech gives apps, IVR prompts and AI agents clear, friendly voices in 30+ languages.

Aria Mateo Noor
Pace
Voice · 30+ languages
03

Talk across languages

MCM AI translates English to Spanish and more, live, so each side of a call hears their own language.

ENCan I change my billing date?
MCM AI translates live
ES¿Puedo cambiar la fecha de mi factura?
02Transcription

Speech-to-text API with speaker labels

Send live audio or recordings and get accurate transcripts with speaker labels and timestamps. Your customers search calls, coach teams and feed insights into the tools they already use.

call-2041
live stream · 2 speakers
0:00 / 0:30
0:000:050:100:150:200:250:30
Agent
Caller
AgentWord timestamps
Thanks0:00for0:00calling,0:01how0:02can0:02I0:03help?0:04
GET /2026-01/transcriptions/call-2041status: streaming
01
LiveBatch

Live and batch modes

Stream a call as it happens, or upload a recording and get the full transcript back.

02
AgentCaller

Speaker labels

Every line is tagged with who spoke, so agents and callers are never mixed up.

03
invoice · 0:09

Word timestamps

Jump to the exact second a word was said, for search, review and coaching.

03Text-to-speech

Text-to-speech API with natural voices

Turn any text into natural speech for IVR prompts, alerts and AI agents. Developers pick a voice and language, tune the pace and stream audio straight into a call.

Pick a voice
+ 30 more
POST /2026-01/speech · language: enaudio: ready

“Your appointment is confirmed for Thursday at 10:30.”

Pace
Natural voices 30+ languages Streaming audio
Stream into
  • IVR prompts
    Greetings and menus
  • Alerts
    Reminders and notices
  • AI agents
    Voices for MCM AI
Streaming audio, straight into the call
04Live translation

Live call translation in real time

MCM AI listens in one language and speaks in another during a live call. An English-speaking agent can help a Spanish-speaking caller, and both hear each other in their own language.

Support agent
Hears and reads English
EN
translatedI have a question about my bill.
Happy to help. Let me check it.
translatedThank you so much.
MCM AI
ES → EN
Caller
Hears and reads Spanish
ES
Tengo una duda sobre mi factura.
translatedCon gusto. Voy a revisarlo.
Muchas gracias.
  • Real-time voice translation
  • Translated captions
  • English to Spanish and more
05Step by step

How live translation works, step by step

Follow one support call from a Spanish-speaking caller to a saved bilingual record.

  1. 1Caller

    Calls support and speaks in Spanish about a billing question.

  2. 2MCM AI

    Transcribes the Spanish speech and translates it into English live.

  3. 3Agent

    Replies in English while the caller hears the answer in Spanish.

  4. 4MCM AI

    Saves a bilingual transcript and summary to the customer record.

06Use cases

Where teams use a speech translation API

One speech AI platform for support, quality, voice apps and AI agents.

Multilingual support

Let any agent help callers in their own language, live.

Call coaching and QA

Search transcripts, review speakers and coach teams from real calls.

IVR and voice alerts

Turn text into clear prompts, reminders and notices.

AI voice agents

Give MCM AI agents natural voices and 30+ languages.

Testimonials

What clients say after 90 days.

Real teams, real numbers — from sales floors, CX desks, and support queues.

“We tried three cloud phone tools before this one. The reason we stayed is boring — it just kept working across four time zones. Our sales team stopped thinking about the phone.”

Arjun Mehta

Head of Growth · Chennai

“The mid-shift dashboard is where I actually spend my day. Queue depth, agent load, and sentiment on one screen — I can coach someone before it turns into a bad review.”

Rachel Monroe

CX Manager · Denver

“AI covers overflow calls in Hindi and English, so we stopped losing weekend leads. It's not perfect — it hands off to us on anything ambiguous — but for hours and bookings, it beats voicemail every time.”

Priya Nair

Support Lead · Bengaluru

“HubSpot sync is quiet infrastructure. Every call, note, and recording just shows up on the contact — nobody has to remember to log it. That's why our forecast is finally accurate.”

Daniel Carter

Head of Sales · Chicago

“I set the whole thing up on my phone during a delayed flight. Six people, three countries, one number that rings all of us. My old provider needed a two-week onboarding for the same thing.”

Neha Iyer

Founder · Mumbai

“Porting 40 numbers across three countries was the part I dreaded most in the migration. It was done in a week, free, and I only had to sign one form. That set the tone for the rest of the rollout.”

Sophie Laurent

COO · Paris

+24%

First Contact Resolution

11 hrs

Per week returned to sales

−38%

Average Handle Time

FAQ

The questions teams ask on the first call.

Which languages does the speech translation API support?expand_more

MCM AI transcribes, speaks and translates in 30+ languages, including English to Spanish.

Can speech be translated during a live call?expand_more

Yes. MCM AI translates speech in real time, so each side of the call hears their own language, with translated captions alongside.

Can I transcribe recordings as well as live calls?expand_more

Yes. Send live streams or recorded files, and transcripts come back with speaker labels and word timestamps.

Does the speech-to-text API label speakers?expand_more

Yes. Every transcript carries speaker labels and word timestamps, so you can search calls and coach teams.

Can I use the text-to-speech voices in my own IVR?expand_more

Yes. Text-to-speech streams straight into calls, IVR prompts, alerts and MCM AI agents.

Can I resell speech and translation AI under my own brand?expand_more

Yes. You resell Speech and Translate AI as your own, so your customers see your brand.

Ready to launch speech translation?

Talk to our partner team and go live with transcription, voices and live translation under your own brand.

Book a DemoTalk to Sales
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