Vapi

Vapi is the leading voice AI infrastructure platform, providing the middleware layer that connects large language models to telephony systems so developers and enterprises can build, deploy, and scale AI voice agents at production grade. Founded in 2023 and backed by Y Combinator, Vapi raised a $50 million Series B in May 2026 at a $500 million valuation led by Peak XV Partners, with participation from Microsoft M12, Kleiner Perkins, and Y Combinator.

The platform supports over 1 million developers, powers more than 2.7 million unique AI agents, and has processed over 1 billion calls. Amazon Ring selected Vapi over 40 competing platforms to handle 100 percent of its inbound phone traffic, making it the flagship enterprise validation of the platform.

Vapi abstracts away the complexity of voice AI infrastructure: latency optimization, turn-taking, interruption handling, multi-language support, CRM integration, and telephony provisioning. Developers can wire in OpenAI GPT, Anthropic Claude, or any LLM and connect to ElevenLabs, Deepgram, or custom TTS/STT providers.

Use cases span AI receptionists, appointment booking, outbound sales dialers, lead qualification, technical support automation, and multi-step workflow routing. Enterprise customers cite sub-500ms latency and 99.9 percent uptime for production deployments.

Pricing starts at $0.05 per minute for hosted infrastructure with volume discounts for high-call-volume enterprises.