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    Automated B2B
    Lead Engine

    unity
    NEW YORK LIFE
    intuit
    Delphi
    Housecall Pro
    Cherry
    unity
    NEW YORK LIFE
    intuit
    Delphi
    Housecall Pro
    Cherry

    Teams at trail-blazing startups to Fortune 500 companies deploy voice agents on the QuantumRealm platform.

    The most configurable API to build leading voice AI products and scale phone operations.

    1OK+
    Calls
    30+
    Assistants Launched
    20K+
    Developers
    API

    Making voice AI simple
    and accessible.

    # npm install @QuantumRealm-ai/server-sdk
    import { QuantumRealmClient } from '@QuantumRealm-ai/server-sdk';
    
    const QuantumRealm = new VapiClient({
      token: 'YOUR_PRIVATE_API_KEY'
    });
    
    async function createCall() {
      const call = await QuantumRealm.calls.create({
        phoneNumberId: 'YOUR_PHONE_NUMBER_ID',
        customer: { number: '+1234567890' },
        assistant: {
          model: {
            provider: 'openai',
            model: 'gpt-4o',
            messages: [
              {
                role: 'system',
                content: 'You are a helpful AI assistant.'
              }
            ]
          }
        }
      });
    }
    Use cases

    Feels human.
    Moves the needle.

    powers 400,000+ daily calls.

    FleetWorks
    saves 100s

    of engineering hours monthly.

    "A key technical requirement was the ability to bring our own stack — QuantumRealm's developer-friendly API-first approach made this possible."

    Quang Tran

    CTO, FleetWorks

    Integrations

    Integrate with more
    than 40+ apps in a snap.

    OpenAI
    Anthropic
    11 Labs
    Deepgram
    Assembly AI
    PlayHT
    Azure
    Gemini
    Groq
    Perplexity
    Gladia
    Twilio
    OpenAI
    Anthropic
    11 Labs
    Deepgram
    Assembly AI
    PlayHT
    Azure
    Gemini
    Groq
    Perplexity
    Gladia
    Twilio
    AWS S3
    GCP
    Google Calendar
    Zendesk
    Notion
    Zapier
    Apollo.io
    Sheets
    Salesforce
    HubSpot
    Five9
    Genesys
    Avaya
    Telnyx
    Make
    Slack
    AWS S3
    GCP
    Google Calendar
    Zendesk
    Notion
    Zapier
    Apollo.io
    Sheets
    Salesforce
    HubSpot
    Five9
    Genesys
    Avaya
    Telnyx
    Make
    Slack
    How It Works

    Try in minutes.
    Deploy in days.

    001

    Choose your workflow.

    Pick from 1000s of pre-made templates, or build one yourself.

    002

    Plug it in.

    Whether it's in your telephony, website, or in your app, we have it covered.

    003

    Done.

    Handle millions of calls and watch how they perform.

    Features

    Flexible for engineers.
    Easy for business users.

    Multilingual

    Talk to agents in English, Spanish, Mandarin, or one of 100+ other supported languages.

    API-native

    Everything is exposed as an API, with 1000s of configurations and integrations.

    Automated testing

    Design test suites of simulated voice agents to identify hallucination risks before going to production.

    Bring your own models

    Bring your own API keys for transcription, LLM, or text-to-speech models. Or, plug in your own self-hosted models.

    Tool calling

    Plug in your APIs as tools to intelligently fetch data and perform actions on your server.

    A/B experiments

    Test different variations of prompts, voices, and flows to continuously optimize performance.

    Enterprise
    Reliable. Scalable. Secure.
    99.99%uptime

    Our custom real-time audio infrastructure operates with enterprise-grade reliability.

    Forward-deployedteam

    Get deployment assistance and a dedicated forward-deployed engineer to go live in a week.

    Sub-500mslatency

    Scale up and down to millions of calls in minutes with ultra-low latency interactions.

    AIguardrails

    Built-in conversation guardrails prevent model hallucinations and ensure data integrity.

    SOC2, HIPAA,PCI compliant

    Enterprise-level security for even the most regulated healthcare and financial services.

    Careers at QuantumRealm

    Brilliant minds. Bleeding-
    edge tech. Relentless drive.

    Join a team of the most cracked people to do rewarding work in an intensely ambitious environment.

    Building the future of voice AI

    Your questions,
    answered.

    Get started today