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The Stack · Voice, speech & video API

Vapi

Developer-first platform to build, test, and deploy real-time voice AI agents with pluggable STT/LLM/TTS and telephony.

API keyUsage-based🔵 agent: self serve instant key
Get API key → instant key, usually no card DocsWebsite
CategoryVoice, speech & video
TypeAPI service
Authapi-key
PricingUsage-based
Agent signup🔵 self serve instant key
SDKsREST, Python, TypeScript

Pricing: $0.05/min platform orchestration fee + pass-through STT/LLM/TTS/telephony (~$0.30/min all-in); $10 initial credits.

🔵 Agents: self serve instant key

Instant self-serve — free signup gives a key immediately (a human unblocks an agent in under 2 minutes).

Free signup with $10 credits and an instant dashboard API key; continued use requires a card. Assistants API, Squads, function calling.

Vapi — Developer-first platform to build, test, and deploy real-time voice AI agents with pluggable STT/LLM/TTS and telephony.
Website: https://vapi.ai
Docs: https://docs.vapi.ai
Get a key: https://dashboard.vapi.ai
Agent signup: self serve instant key — Free signup with $10 credits and an instant dashboard API key; continued use requires a card. Assistants API, Squads, function calling.
Auth: api-key
Pricing: usage-based — $0.05/min platform orchestration fee + pass-through STT/LLM/TTS/telephony (~$0.30/min all-in); $10 initial credits.
Full record: https://dreaming.press/api/tools/vapi.json

Machine record: /api/tools/vapi.json

Quickstart

curl https://api.vapi.ai/assistant \
  -H "Authorization: Bearer $VAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Support",
    "model": {"provider":"openai","model":"gpt-4o"},
    "voice": {"provider":"11labs","voiceId":"burt"}
  }'

bash · full docs →

Vapi in our coverage

Full-Duplex Voice Is the Headline. Cascaded Is Still the Product: Choosing a Voice Stack After GPT-Live

Higgs Audio v3: A Chat-Native Open TTS for Voice Agents — With a License You Have to Read

How to Test an AI Agent With Simulated Users (and Why the Fake User Is the Hard Part)

OpenAI Realtime API vs Gemini Live API: Picking a Voice Agent Backend

Turn Detection for Voice Agents: VAD vs Semantic End-of-Utterance

Cartesia vs ElevenLabs vs Kokoro: Choosing TTS for Voice Agents

Vapi FAQ

What is Vapi?

Vapi is Developer-first platform to build, test, and deploy real-time voice AI agents with pluggable STT/LLM/TTS and telephony. It's in the Voice, speech & video category of the dreaming.press tool directory.

Is Vapi free?

Vapi is usage-based (you pay for what you use). $0.05/min platform orchestration fee + pass-through STT/LLM/TTS/telephony (~$0.30/min all-in); $10 initial credits..

Can an AI agent sign up for Vapi automatically?

Almost — signup is instant and self-serve (a free key with no sales call), so a human can unblock an agent in under two minutes. Free signup with $10 credits and an instant dashboard API key; continued use requires a card. Assistants API, Squads, function calling..

Does Vapi have an MCP server?

Vapi does not publish an official MCP server as of our last check.

Is Vapi open source?

Vapi is a hosted API service, not an open-source project.

What languages does Vapi support?

Vapi offers REST, Python, TypeScript.

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We track the AI stack so you don't have to — pricing, MCP support, and which tools an agent can sign up for. Free.