Best Multilingual Voice Agent APIs

Our pick: ElevenLabs Conversational AI (ElevenAgents)

ElevenLabs Conversational AI (ElevenAgents) is a real-time voice agent platform for building inbound and outbound phone automation, covering use cases from customer support and appointment scheduling to healthcare answering services and sales calls. Pricing starts at $0.08 per minute with a free tier of 15 minutes per month, scaling through self-serve plans up to enterprise; telephony costs are billed separately. The platform holds SOC 2 Type 2, HIPAA, GDPR, ISO 27001, and PCI DSS certifications, with SDKs for Python, TypeScript, React, React Native, and Kotlin, plus an MCP server and support for bring-your-own LLM and voice.

Best for: Prototypes and side projects - free to start, no sales call; Regulated or enterprise workloads - compliance attestations and an enterprise plan; AI agents and automation - an agent-ready surface (MCP / llms.txt).

ElevenLabs Conversational AI (ElevenAgents) profile →

Best for…

Best overall

ElevenLabs Conversational AI (ElevenAgents) - our default pick: strongest across pricing, trust and breadth

Best free pick

ElevenLabs Conversational AI (ElevenAgents) - free tier: Free plan at $0/month includes 15 minutes of agent calls per month, up to 4 concurrent ca…

Best for enterprise

ElevenLabs Conversational AI (ElevenAgents) - for regulated or large teams: SOC 2 Type II, HIPAA, enterprise plan

Cheapest to start

OpenAI Realtime API (gpt-realtime) - from $0.02 minute (audio input) to start; compare on your real usage, not the entry price

Best for agents

ElevenLabs Conversational AI (ElevenAgents) - easiest to wire up programmatically: MCP server + llms.txt

Broadest surface

Telnyx Voice AI Agents - 26 documented actions; breadth isn't quality, but it's the most to build on

Ranked (6)

• #1 ElevenLabs Conversational AI (ElevenAgents)

  ████████░░ 81 / 100
  • Best overall
  • Best free pick
  • Best for enterprise
  • Best for agents

  ElevenLabs Conversational AI (ElevenAgents) is a real-time voice agent platform for building inbound and outbound phone automation, covering use cases from customer support and appointment scheduling to healthcare answering services and sales calls. Pricing starts at $0.08 per minute with a free tier of 15 minutes per month, scaling through self-serve plans up to enterprise; telephony costs are billed separately. The platform holds SOC 2 Type 2, HIPAA, GDPR, ISO 27001, and PCI DSS certifications, with SDKs for Python, TypeScript, React, React Native, and Kotlin, plus an MCP server and support for bring-your-own LLM and voice.

  PricingHybrid · from $0.08 minute · free tier ✓

  TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS

  Does

  • Outbound calling
  • BYO models
  • Multilingual

  Used byRevolut, Deliveroo, Epic Games, Deutsche Telekom

  ElevenLabs Conversational AI (ElevenAgents) profile →

• #2 OpenAI Realtime API (gpt-realtime)

  ███████░░░ 72 / 100
  • Cheapest to start

  OpenAI Realtime API is a WebSocket-based service for low-latency, bidirectional speech-to-speech communication, targeting developers building voice agents, real-time translation, live transcription, and call center automation. Pricing is usage-based starting at $0.0192 per minute of audio input, with self-serve signup and no sales call required. The API supports function calling, voice activity detection, interruption handling, and inbound SIP telephony via a third-party carrier. It holds SOC 2 Type II, HIPAA, GDPR, ISO 27001, and PCI DSS certifications, with SDKs available for Python, Node.js, Go, Java, Ruby, and .NET.

  PricingUsage · from $0.02 minute (audio input) · free tier ✗

  TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS

  Does

  • Multilingual

  Used byPerplexity, Healthify, Speak, Zillow

  Avoid ifYou want to try it free before paying

  OpenAI Realtime API (gpt-realtime) profile →

• #3 Telnyx Voice AI Agents

  ███████▓░░ 78 / 100
  • Broadest surface

  Telnyx Voice AI Agents is a carrier-grade platform for building inbound and outbound voice AI, covering customer support automation, appointment scheduling, healthcare, and call center use cases across 45+ countries. Pricing is usage-based at $0.05 per minute with self-serve signup and no sales call required. The platform supports bring-your-own LLM and voice, function calling, SIP trunking, and SDKs for Node.js, Python, PHP, Java, Ruby, and Go. It holds SOC 2 Type II, HIPAA, GDPR, ISO 27001, and PCI DSS certifications, and customers include Dialpad, Alibaba, and Grupo Bimbo.

  PricingUsage · from $0.05 minute · free tier ✗

  TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS

  Does

  • Built-in telephony
  • Outbound calling
  • BYO models
  • Multilingual

  Used byDialpad, Alibaba, AudioCodes, UJET

  Avoid ifYou want to try it free before paying

  Telnyx Voice AI Agents profile →

• #4 Twilio ConversationRelay

  ███████▒░░ 76 / 100

  Twilio ConversationRelay is a WebSocket-based orchestration layer that handles speech recognition, text-to-speech, and real-time conversation flow for AI voice agents over PSTN, SIP, and WebRTC, supporting bring-your-own LLM and voice providers. It targets developers building inbound and outbound call automation, such as customer support, appointment scheduling, and live agent escalation. Pricing starts at $0.07 per minute for the orchestration layer, billed separately from underlying voice costs, with self-serve signup and SDKs for seven languages. The service reached general availability in May 2025 and holds SOC 2 Type II, HIPAA, GDPR, ISO 27001, and PCI DSS certifications, though HIPAA coverage requires a Security or Enterprise Edition account.

  PricingUsage · from $0.07 minute · free tier ✗

  TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS

  Does

  • Built-in telephony
  • Outbound calling
  • BYO models
  • Multilingual

  Used byOhMD, Scorpion

  Avoid ifYou want to try it free before paying

  Twilio ConversationRelay profile →

• #5 Vapi

  ███████▒░░ 75 / 100

  Vapi is a voice agent platform for building and deploying AI-powered phone agents handling inbound calls, outbound dialing, appointment scheduling, and lead qualification. Pricing is usage-based at $0.05 per minute with self-serve signup and no sales call required, plus an enterprise plan for custom concurrency. The REST API supports bring-your-own LLM and voice providers, ships SDKs for over ten languages and runtimes including mobile, and holds SOC 2 Type 2, HIPAA, GDPR, and PCI DSS certifications, with customers including New York Life and Intuit.

  PricingUsage · from $0.05 minute · free tier ✓

  TrustSOC 2 Type II · HIPAA · GDPR · PCI DSS

  Does

  • Built-in telephony
  • Outbound calling
  • BYO models
  • Multilingual

  Used byAmazon Ring, Kavak, Instawork, New York Life

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• #6 Deepgram Voice Agent API

  ██████▓░░░ 68 / 100

  Deepgram Voice Agent API is a single WebSocket-based interface for building real-time voice AI agents, covering inbound and outbound telephony, function calling, interruption handling, and multi-agent orchestration, with SDKs for Python, Node.js, Go, and C#/.NET. Pricing is usage-based at $0.075 per minute with a one-time $200 trial credit and self-serve signup, scaling to enterprise plans with 100 or more concurrent connections. The platform holds SOC 2 Type 2, HIPAA, GDPR, and PCI DSS certifications and reached general availability in June 2025, with customers including NASA, IBM, Five9, and Aircall. Telephony requires Twilio or Amazon Connect for PSTN access, and the Growth plan carries a $4,000 per year minimum commitment.

  PricingUsage · from $0.07 minute · free tier ✗

  TrustSOC 2 Type II · HIPAA · GDPR · PCI DSS

  Does

  • Outbound calling
  • BYO models
  • Multilingual

  Used byAircall, Jack in the Box, OpenPhone, NASA

  Avoid ifYou want to try it free before paying

  Deepgram Voice Agent API profile →