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Text-to-speech API for high-stakes structured speech

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For systems where precision is not optional

account_balance

Banking and finance

Speak account numbers, transaction amounts, and verification codes accurately for phone banking and automated financial services.

local_hospital

Healthcare

Read patient IDs, prescription codes, dosage information, and appointment details with no errors in spoken output.

local_shipping

Logistics

Speak tracking numbers, addresses, route codes, and delivery confirmations accurately across multilingual supply chains.

fingerprint

Identity verification

Read back PINs, one-time codes, and personal identifiers exactly as generated, so users can verify without confusion.

Why Soniox is the best text-to-speech API for structured data

Phone numbers, email addresses, PINs, account IDs, postal codes. When structured data must be spoken aloud, there is no room for error. Most TTS systems scramble digits, skip characters, or hallucinate content.

A text-to-speech system for high-stakes structured speech should:

  • Render alphanumerics faithfully, speaking every digit, letter, and symbol exactly as provided.
  • Never hallucinate or drop content, ensuring the spoken output matches the input text completely.
  • Handle mixed content naturally, combining structured data and natural language in the same utterance.
  • Pronounce foreign names and addresses correctly across 60+ languages.
  • Deliver consistent results at scale, with identical behavior across millions of requests.

Soniox TTS is designed for precision. It speaks structured data exactly as written, with correct pacing, grouping, and pronunciation in any language.

With a competitive pricing, Soniox makes it practical to add accurate voice output to any system that handles critical data.

Hallucination-free speech for data that cannot be wrong

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What you send is what gets spoken

Soniox TTS does not invent words, skip characters, or substitute content. The output faithfully matches the input text, character by character when needed.

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Built-in alphanumeric intelligence

Soniox understands the structure of phone numbers, emails, codes, and IDs. It applies the right pacing and grouping so listeners can follow along easily.

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description

Handle mixed content naturally

Speak sentences that combine natural language with embedded data, like "Your confirmation code is A7X-4921", without breaking flow or mispronouncing the code.

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Structured data in any language

Read back addresses, names, and codes in 60+ languages with correct pronunciation. Handle foreign names embedded in any language context.

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Reliable at scale for production systems

Consistent behavior across millions of requests. The same input always produces the same correct output, with no drift or degradation.

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Why it works

When structured data must be spoken aloud, there is no room for error. Soniox TTS combines hallucination-free rendering, alphanumeric intelligence, multilingual support, and production-grade reliability in one API built for high-stakes use cases.

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Use Soniox in popular frameworks

Soniox integrates seamlessly with leading real-time communication platforms, AI frameworks, automation tools, and developer SDKs.

An open source framework and developer platform for building, testing, deploying, scaling, and observing agents in production.

Open source framework for voice and multimodal conversational AI.

Twilio is a cloud-based customer engagement platform (CPaaS) that provides APIs, allowing developers to integrate voice, messaging (SMS, WhatsApp), email, and authentication capabilities into applications.

Open-source development framework designed to build applications powered by large language models (LLMs).

The open-source AI toolkit designed to help developers build AI-powered applications and agents with React, Next.js, Vue, Svelte, Node.js, and more.

Open-source AI SDK with a unified interface across multiple providers. No vendor lock-in, no proprietary formats.

n8n is a powerful, low-code/pro-code workflow automation tool that connects various applications, APIs, and databases to automate tasks.

Privacy and compliance, built right in

Never stored, never saved.

Audio stays in memory, everything is processed in real-time.

Built for privacy-critical use cases.

Adhering to leading global security, privacy, and compliance standards.

Trusted where privacy matters most.

Used in industries where speech is sensitive, from healthcare to enterprise.

Soniox is Soc 2 Type 2 compliant
Soniox is ISO 27001:2022 compliant
Soniox is HIPAA compliant
Soniox is GDPR compliant
SOC 2 Type 2 · ISO/IEC 27001:2022 · HIPAA · GDPR

Frequently asked questions about Soniox TTS for structured data

What does "hallucination-free" mean for text-to-speech?arrow_downward
Hallucination-free means the TTS output faithfully matches the input text. Soniox does not invent, skip, or substitute words, digits, or characters. What you send is exactly what gets spoken.
Can Soniox TTS read phone numbers and email addresses correctly?arrow_downward
Yes. Soniox understands the structure of phone numbers, email addresses, and similar alphanumeric content. It applies appropriate pacing and grouping so listeners can follow along and note down the information correctly.
How does Soniox handle sentences that mix text and structured data?arrow_downward
Soniox handles mixed content naturally. A sentence like "Your confirmation code is A7X-4921" is spoken with the right transition between conversational text and structured data, without breaking flow.
Does Soniox TTS produce consistent output for the same input?arrow_downward
Yes. The same input text always produces the same correct spoken output. This consistency is critical for automated systems where predictable behavior matters.
Can Soniox speak structured data in multiple languages?arrow_downward
Yes. Soniox supports 60+ languages and correctly pronounces addresses, names, codes, and other structured data in any supported language, including content with mixed-language elements.
Is Soniox TTS suitable for regulated industries?arrow_downward
Yes. Soniox supports data residency for regulated environments, allowing speech generation to remain within required geographic regions. Audio is not stored by default.
How do I get started with Soniox TTS?arrow_downward
Generate an API key on Soniox Console and start sending text to the TTS API. Test with your own structured data to see how Soniox handles phone numbers, codes, and mixed content.

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See what you’ll pay

Pay only for what you use with our flexible pricing. Built to scale with you.

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