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Vapi

Vapi is a San Francisco-based voice AI platform that lets developers build real-time, low-latency voice agents over phone, web, and SIP. It orchestrates three modular components — a transcriber (STT), an LLM, and a voice (TTS) — into a sub-700ms voice-to-voice pipeline, with first-class support for tools/function calling, multi-agent squads, outbound campaigns, persistent sessions, structured outputs, recording artifacts, evaluation scorecards, and a full REST API plus official SDKs in TypeScript, Python, C#, Ruby, PHP, and client SDKs for Web, React Native, iOS, and Python. Vapi is a Y Combinator company.

15 APIs 15 Capabilities 16 Features
AIVoice AIVoice AgentsConversational AITelephonyReal-TimeTranscriptionText-to-SpeechLLMAgentsMCP

Vapi publishes 15 APIs on the APIs.io network, including Assistants API, Calls API, Phone Numbers API, and 12 more. Tagged areas include AI, Voice AI, Voice Agents, Conversational AI, and Telephony.

The Vapi catalog on APIs.io includes 15 machine-runnable capabilities, 1 JSON-LD context, and 1 Spectral governance ruleset.

Vapi’s developer surface includes developer portal, documentation, getting-started guide, signup flow, pricing, engineering blog, changelog, and 31 more developer resources.

APIs

Vapi Assistants API

Create and manage Vapi voice assistants. An assistant bundles a transcriber, LLM, voice (TTS), server URL, tools, first message, system prompt, voicemail handling, and call anal...

Vapi Calls API

Create outbound calls, accept inbound calls, list and filter calls, fetch call status and analysis, delete call data, and download per-call artifacts including mono and stereo r...

Vapi Phone Numbers API

Buy, BYO-import, and manage phone numbers from Vapi (vapi.phoneNumber), Twilio, Telnyx, Vonage, and SIP trunks. Attach an assistant or squad to a number for inbound routing and ...

Vapi Squads API

Compose multiple assistants into a Squad — a multi-agent workflow where the active assistant can hand off a live call to another assistant in the squad based on tools, intents, ...

Vapi Tools API

Define and manage Tools (function tools, transfer-call tools, end-call tools, DTMF tools, hangup tools, voicemail tools, MCP tools, query tools, Make/Zapier tools, knowledge-bas...

Vapi Files API

Upload, list, retrieve, update, and delete files used as inputs to knowledge bases and other assistant-side artifacts.

Vapi Chats API

Text-based conversation surface that reuses the same assistant configuration as voice calls, including an OpenAI-compatible /chat/responses endpoint for drop-in replacement of O...

Vapi Sessions API

Stateful sessions that persist conversation history across calls and chats so an assistant can pick up where the customer left off.

Vapi Campaigns API

Outbound calling campaigns — upload a customer list and schedule batched outbound calls against one or more assistants and phone numbers with concurrency and retry policies.

Vapi Analytics API

Run aggregate analytics queries across calls — group by assistant, time bucket, status, end-reason, success evaluation, cost, and duration — for dashboards and chargeback report...

Vapi Insight API

Define and run Insight queries across call data, including preview-before-save and on-demand runs, to extract structured signals from conversation transcripts.

Vapi Observability Scorecard API

Define LLM-graded scorecards that automatically evaluate every call against your defined success criteria and produce structured scores for trend analysis and regression detection.

Vapi Eval API

Create test suites that simulate end-user behavior against an assistant, run them on demand, and inspect per-run pass/fail and judge output for regression testing of voice agents.

Vapi Structured Outputs API

Define JSON-Schema-driven structured outputs that the assistant must populate from a call, plus an on-demand /structured-output/run endpoint to backfill outputs against an exist...

Vapi Provider Resources API

Generic CRUD over provider-side resources (e.g. ElevenLabs voices, Cartesia voices, Deepgram custom models) so they can be created and managed through Vapi without leaving the p...

Capabilities

Vapi Analytics API — Analytics

Vapi Analytics API — Analytics. 1 operations. Self-contained Naftiko capability covering the Vapi Analytics business surface.

Run with Naftiko

Vapi Assistants API — Assistants

Vapi Assistants API — Assistants. 5 operations. Self-contained Naftiko capability covering the Vapi Assistants business surface.

Run with Naftiko

Vapi Calls API — Calls

Vapi Calls API — Calls. 12 operations. Self-contained Naftiko capability covering the Vapi Calls business surface.

Run with Naftiko

Vapi Campaigns API — Campaigns

Vapi Campaigns API — Campaigns. 5 operations. Self-contained Naftiko capability covering the Vapi Campaigns business surface.

Run with Naftiko

Vapi Chats API — Chats

Vapi Chats API — Chats. 5 operations. Self-contained Naftiko capability covering the Vapi Chats business surface.

Run with Naftiko

Vapi Eval API — Eval

Vapi Eval API — Eval. 9 operations. Self-contained Naftiko capability covering the Vapi Eval business surface.

Run with Naftiko

Vapi Files API — Files

Vapi Files API — Files. 5 operations. Self-contained Naftiko capability covering the Vapi Files business surface.

Run with Naftiko

Vapi Insight API — Insight

Vapi Insight API — Insight. 7 operations. Self-contained Naftiko capability covering the Vapi Insight business surface.

Run with Naftiko

Vapi Observability/Scorecard API — Observability/Scorecard

Vapi Observability/Scorecard API — Observability/Scorecard. 5 operations. Self-contained Naftiko capability covering the Vapi Observability/Scorecard business surface.

Run with Naftiko

Vapi Phone Numbers API — Phone Numbers

Vapi Phone Numbers API — Phone Numbers. 6 operations. Self-contained Naftiko capability covering the Vapi Phone Numbers business surface.

Run with Naftiko

Vapi Provider Resources API — Provider Resources

Vapi Provider Resources API — Provider Resources. 5 operations. Self-contained Naftiko capability covering the Vapi Provider Resources business surface.

Run with Naftiko

Vapi Sessions API — Sessions

Vapi Sessions API — Sessions. 5 operations. Self-contained Naftiko capability covering the Vapi Sessions business surface.

Run with Naftiko

Vapi Squads API — Squads

Vapi Squads API — Squads. 5 operations. Self-contained Naftiko capability covering the Vapi Squads business surface.

Run with Naftiko

Vapi Structured Outputs API — Structured Outputs

Vapi Structured Outputs API — Structured Outputs. 6 operations. Self-contained Naftiko capability covering the Vapi Structured Outputs business surface.

Run with Naftiko

Vapi Tools API — Tools

Vapi Tools API — Tools. 5 operations. Self-contained Naftiko capability covering the Vapi Tools business surface.

Run with Naftiko

Features

Sub-700ms voice-to-voice latency orchestration layer
Transcriber + LLM + voice (TTS) modular pipeline with multi-provider choice
Bring your own provider keys to pay providers at cost
Assistants, Squads (multi-agent handoff), Sessions (persistent state)
Inbound and outbound calling over Twilio, Telnyx, Vonage, vapi.phoneNumber, and SIP
Campaigns for batched outbound calling with concurrency/retry
Tools (function, transfer-call, end-call, DTMF, hangup, voicemail, MCP, query, Make, Zapier, GHL, KB)
Server URL webhooks for real-time call events and function execution
Per-call mono/stereo/customer/assistant/video recordings, PCAP packet captures, call logs
Analytics, Insights, Observability Scorecards, and Evals for production monitoring and regression testing
Structured Outputs for JSON-schema-constrained extraction from calls
Chats API (text channel) and OpenAI-compatible /chat/responses
Official SDKs - server (TS, Python, C#, Ruby, PHP) and client (Web, Python, React Native, iOS, HTML)
Vapi MCP Server for Model Context Protocol integration
HIPAA and Zero Data Retention add-ons; SOC2 and PCI on Scale plan
$0.05/min Vapi orchestration fee on Build plan; model and voice costs passed at cost

Semantic Vocabularies

Vapi Ai Context

0 classes · 12 properties

JSON-LD

API Governance Rules

Vapi API Rules

17 rules · 11 errors 6 warnings

SPECTRAL

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Sources

Raw ↑ 
aid: vapi-ai
url: https://raw.githubusercontent.com/api-evangelist/vapi-ai/refs/heads/main/apis.yml
apis:
- aid: vapi-ai:vapi-assistants-api
  name: Vapi Assistants API
  tags:
  - Assistants
  - Voice AI
  - Agents
  humanURL: https://docs.vapi.ai/api-reference/assistants/list
  properties:
  - url: https://docs.vapi.ai/api-reference/assistants/list
    type: Documentation
  - url: openapi/vapi-assistants-api-openapi.yml
    type: OpenAPI
  - url: json-schema/vapi-assistant-schema.json
    type: JSONSchema
  - url: json-structure/vapi-assistant-structure.json
    type: JSONStructure
  - url: examples/vapi-assistant-example.json
    type: Example
  - type: NaftikoCapability
    url: capabilities/assistants-assistants.yaml
  description: Create and manage Vapi voice assistants. An assistant bundles a transcriber, LLM, voice (TTS),
    server URL, tools, first message, system prompt, voicemail handling, and call analysis plan into a reusable
    voice agent configuration that can be attached to inbound or outbound phone numbers, web calls, or squads.
- aid: vapi-ai:vapi-calls-api
  name: Vapi Calls API
  tags:
  - Calls
  - Voice AI
  - Telephony
  humanURL: https://docs.vapi.ai/api-reference/calls/list
  properties:
  - url: https://docs.vapi.ai/api-reference/calls/list
    type: Documentation
  - url: openapi/vapi-calls-api-openapi.yml
    type: OpenAPI
  - url: json-schema/vapi-call-schema.json
    type: JSONSchema
  - url: json-structure/vapi-call-structure.json
    type: JSONStructure
  - url: examples/vapi-call-example.json
    type: Example
  - type: NaftikoCapability
    url: capabilities/calls-calls.yaml
  description: Create outbound calls, accept inbound calls, list and filter calls, fetch call status and analysis,
    delete call data, and download per-call artifacts including mono and stereo recordings, customer/assistant
    isolated recordings, video recordings, PCAP packet captures, and structured call logs.
- aid: vapi-ai:vapi-phone-numbers-api
  name: Vapi Phone Numbers API
  tags:
  - Phone Numbers
  - Telephony
  - Voice AI
  humanURL: https://docs.vapi.ai/api-reference/phone-numbers/list
  properties:
  - url: https://docs.vapi.ai/api-reference/phone-numbers/list
    type: Documentation
  - url: openapi/vapi-phone-numbers-api-openapi.yml
    type: OpenAPI
  - url: json-schema/vapi-phone-number-schema.json
    type: JSONSchema
  - url: json-structure/vapi-phone-number-structure.json
    type: JSONStructure
  - url: examples/vapi-phone-number-example.json
    type: Example
  - type: NaftikoCapability
    url: capabilities/phone-numbers-phone-numbers.yaml
  description: Buy, BYO-import, and manage phone numbers from Vapi (vapi.phoneNumber), Twilio, Telnyx, Vonage,
    and SIP trunks. Attach an assistant or squad to a number for inbound routing and configure outbound caller-id
    behavior.
- aid: vapi-ai:vapi-squads-api
  name: Vapi Squads API
  tags:
  - Squads
  - Voice AI
  - Agents
  humanURL: https://docs.vapi.ai/api-reference/squads/list
  properties:
  - url: https://docs.vapi.ai/api-reference/squads/list
    type: Documentation
  - url: openapi/vapi-squads-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/squads-squads.yaml
  description: Compose multiple assistants into a Squad — a multi-agent workflow where the active assistant can
    hand off a live call to another assistant in the squad based on tools, intents, or transfer destinations.
- aid: vapi-ai:vapi-tools-api
  name: Vapi Tools API
  tags:
  - Tools
  - Voice AI
  - Function Calling
  humanURL: https://docs.vapi.ai/api-reference/tools/list
  properties:
  - url: https://docs.vapi.ai/api-reference/tools/list
    type: Documentation
  - url: openapi/vapi-tools-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/tools-tools.yaml
  description: Define and manage Tools (function tools, transfer-call tools, end-call tools, DTMF tools, hangup
    tools, voicemail tools, MCP tools, query tools, Make/Zapier tools, knowledge-base tools, and Google/Slack/
    GoHighLevel integrations) that the assistant LLM can invoke during a call.
- aid: vapi-ai:vapi-files-api
  name: Vapi Files API
  tags:
  - Files
  - Voice AI
  - Knowledge Base
  humanURL: https://docs.vapi.ai/api-reference/files/list
  properties:
  - url: https://docs.vapi.ai/api-reference/files/list
    type: Documentation
  - url: openapi/vapi-files-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/files-files.yaml
  description: Upload, list, retrieve, update, and delete files used as inputs to knowledge bases and other
    assistant-side artifacts.
- aid: vapi-ai:vapi-chats-api
  name: Vapi Chats API
  tags:
  - Chats
  - Voice AI
  - Text
  humanURL: https://docs.vapi.ai/api-reference/chats/list
  properties:
  - url: https://docs.vapi.ai/api-reference/chats/list
    type: Documentation
  - url: openapi/vapi-chats-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/chats-chats.yaml
  description: Text-based conversation surface that reuses the same assistant configuration as voice calls,
    including an OpenAI-compatible /chat/responses endpoint for drop-in replacement of OpenAI chat completions.
- aid: vapi-ai:vapi-sessions-api
  name: Vapi Sessions API
  tags:
  - Sessions
  - Voice AI
  - State
  humanURL: https://docs.vapi.ai/api-reference/sessions/list
  properties:
  - url: https://docs.vapi.ai/api-reference/sessions/list
    type: Documentation
  - url: openapi/vapi-sessions-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/sessions-sessions.yaml
  description: Stateful sessions that persist conversation history across calls and chats so an assistant can
    pick up where the customer left off.
- aid: vapi-ai:vapi-campaigns-api
  name: Vapi Campaigns API
  tags:
  - Campaigns
  - Voice AI
  - Outbound
  humanURL: https://docs.vapi.ai/api-reference/campaigns/list
  properties:
  - url: https://docs.vapi.ai/api-reference/campaigns/list
    type: Documentation
  - url: openapi/vapi-campaigns-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/campaigns-campaigns.yaml
  description: Outbound calling campaigns — upload a customer list and schedule batched outbound calls against
    one or more assistants and phone numbers with concurrency and retry policies.
- aid: vapi-ai:vapi-analytics-api
  name: Vapi Analytics API
  tags:
  - Analytics
  - Voice AI
  - Reporting
  humanURL: https://docs.vapi.ai/api-reference/analytics/create
  properties:
  - url: https://docs.vapi.ai/api-reference/analytics/create
    type: Documentation
  - url: openapi/vapi-analytics-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/analytics-analytics.yaml
  description: Run aggregate analytics queries across calls — group by assistant, time bucket, status,
    end-reason, success evaluation, cost, and duration — for dashboards and chargeback reporting.
- aid: vapi-ai:vapi-insight-api
  name: Vapi Insight API
  tags:
  - Insight
  - Voice AI
  - Observability
  humanURL: https://docs.vapi.ai/api-reference/insights/list
  properties:
  - url: https://docs.vapi.ai/api-reference/insights/list
    type: Documentation
  - url: openapi/vapi-insight-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/insight-insight.yaml
  description: Define and run Insight queries across call data, including preview-before-save and on-demand
    runs, to extract structured signals from conversation transcripts.
- aid: vapi-ai:vapi-observability-api
  name: Vapi Observability Scorecard API
  tags:
  - Observability
  - Scorecard
  - Voice AI
  - Evaluation
  humanURL: https://docs.vapi.ai/api-reference/scorecards/list
  properties:
  - url: https://docs.vapi.ai/api-reference/scorecards/list
    type: Documentation
  - url: openapi/vapi-observability-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/observability-observability.yaml
  description: Define LLM-graded scorecards that automatically evaluate every call against your defined
    success criteria and produce structured scores for trend analysis and regression detection.
- aid: vapi-ai:vapi-eval-api
  name: Vapi Eval API
  tags:
  - Eval
  - Voice AI
  - Testing
  humanURL: https://docs.vapi.ai/api-reference/evals/list
  properties:
  - url: https://docs.vapi.ai/api-reference/evals/list
    type: Documentation
  - url: openapi/vapi-eval-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/eval-eval.yaml
  description: Create test suites that simulate end-user behavior against an assistant, run them on demand,
    and inspect per-run pass/fail and judge output for regression testing of voice agents.
- aid: vapi-ai:vapi-structured-outputs-api
  name: Vapi Structured Outputs API
  tags:
  - Structured Outputs
  - Voice AI
  humanURL: https://docs.vapi.ai/api-reference/structured-outputs/list
  properties:
  - url: https://docs.vapi.ai/api-reference/structured-outputs/list
    type: Documentation
  - url: openapi/vapi-structured-outputs-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/structured-outputs-structured-outputs.yaml
  description: Define JSON-Schema-driven structured outputs that the assistant must populate from a call,
    plus an on-demand /structured-output/run endpoint to backfill outputs against an existing transcript.
- aid: vapi-ai:vapi-provider-resources-api
  name: Vapi Provider Resources API
  tags:
  - Provider Resources
  - Voice AI
  - Integrations
  humanURL: https://docs.vapi.ai/api-reference/provider-resources/list
  properties:
  - url: https://docs.vapi.ai/api-reference/provider-resources/list
    type: Documentation
  - url: openapi/vapi-provider-resources-api-openapi.yml
    type: OpenAPI
  - type: NaftikoCapability
    url: capabilities/provider-resources-provider-resources.yaml
  description: Generic CRUD over provider-side resources (e.g. ElevenLabs voices, Cartesia voices, Deepgram
    custom models) so they can be created and managed through Vapi without leaving the platform.
name: Vapi
tags:
- AI
- Voice AI
- Voice Agents
- Conversational AI
- Telephony
- Real-Time
- Transcription
- Text-to-Speech
- LLM
- Agents
- MCP
kind: contract
image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
access: 3rd-Party
common:
- url: https://vapi.ai
  type: Portal
- url: https://docs.vapi.ai
  name: Vapi Docs
  type: Documentation
- url: https://api.vapi.ai/api
  name: Swagger UI
  type: Documentation
- url: https://api.vapi.ai/api-json
  name: Raw OpenAPI JSON
  type: OpenAPI
- url: https://docs.vapi.ai/quickstart
  name: Quickstart
  type: GettingStarted
- url: https://dashboard.vapi.ai
  name: Vapi Dashboard
  type: SignUp
- url: https://status.vapi.ai
  name: Vapi Status
  type: StatusPage
- url: https://vapi.ai/pricing
  name: Vapi Pricing
  type: Pricing
- url: https://discord.gg/pUFNcf2WmH
  name: Vapi Discord
  type: Forum
- url: https://vapi.ai/blog
  name: Vapi Blog
  type: Blog
- url: https://vapi.ai/changelog
  name: Vapi Changelog
  type: ChangeLog
- url: https://github.com/VapiAI
  name: Vapi GitHub
  type: GitHubOrganization
- url: https://github.com/VapiAI/server-sdk-typescript
  name: TypeScript Server SDK
  type: SDK
- url: https://github.com/VapiAI/server-sdk-python
  name: Python Server SDK
  type: SDK
- url: https://github.com/VapiAI/server-sdk-csharp
  name: C# Server SDK
  type: SDK
- url: https://github.com/VapiAI/server-sdk-ruby
  name: Ruby Server SDK
  type: SDK
- url: https://github.com/VapiAI/server-sdk-php
  name: PHP Server SDK
  type: SDK
- url: https://github.com/VapiAI/client-sdk-web
  name: Web Client SDK
  type: SDK
- url: https://github.com/VapiAI/client-sdk-python
  name: Python Client SDK
  type: SDK
- url: https://github.com/VapiAI/client-sdk-react-native
  name: React Native Client SDK
  type: SDK
- url: https://github.com/VapiAI/client-sdk-ios
  name: iOS Client SDK
  type: SDK
- url: https://github.com/VapiAI/client-sdk-html-script-tag
  name: HTML Script Tag Client SDK
  type: SDK
- url: https://github.com/VapiAI/mcp-server
  name: Vapi MCP Server
  type: Tool
- url: https://github.com/VapiAI/skills
  name: Vapi Agent Skills
  type: Tool
- url: https://github.com/VapiAI/gitops
  name: Vapi GitOps
  type: Tool
- url: https://github.com/VapiAI/docs
  name: Vapi Docs Repo
  type: CodeExamples
- url: https://docs.vapi.ai/server-url
  name: Server URL (Webhooks)
  type: Webhooks
- url: https://docs.vapi.ai/server-url/events
  name: Server Events
  type: Webhooks
- url: https://trust.vapi.ai
  name: Vapi Trust Center
  type: TrustCenter
- url: https://vapi.ai/privacy
  type: PrivacyPolicy
- url: https://vapi.ai/terms-of-service
  type: TermsOfService
- url: https://vapi.ai/aup
  type: TermsOfService
- url: https://x.com/Vapi_AI
  type: Twitter
- url: https://www.linkedin.com/company/vapi-ai
  type: LinkedIn
- url: https://www.ycombinator.com/companies/vapi
  name: Y Combinator Profile
  type: Documentation
- url: plans/vapi-ai-plans-pricing.yml
  type: Plans
- url: rate-limits/vapi-ai-rate-limits.yml
  type: RateLimits
- url: finops/vapi-ai-finops.yml
  type: FinOps
- type: Features
  data:
  - Sub-700ms voice-to-voice latency orchestration layer
  - Transcriber + LLM + voice (TTS) modular pipeline with multi-provider choice
  - Bring your own provider keys to pay providers at cost
  - Assistants, Squads (multi-agent handoff), Sessions (persistent state)
  - Inbound and outbound calling over Twilio, Telnyx, Vonage, vapi.phoneNumber, and SIP
  - Campaigns for batched outbound calling with concurrency/retry
  - Tools (function, transfer-call, end-call, DTMF, hangup, voicemail, MCP, query, Make, Zapier, GHL, KB)
  - Server URL webhooks for real-time call events and function execution
  - Per-call mono/stereo/customer/assistant/video recordings, PCAP packet captures, call logs
  - Analytics, Insights, Observability Scorecards, and Evals for production monitoring and regression testing
  - Structured Outputs for JSON-schema-constrained extraction from calls
  - Chats API (text channel) and OpenAI-compatible /chat/responses
  - Official SDKs - server (TS, Python, C#, Ruby, PHP) and client (Web, Python, React Native, iOS, HTML)
  - Vapi MCP Server for Model Context Protocol integration
  - HIPAA and Zero Data Retention add-ons; SOC2 and PCI on Scale plan
  - $0.05/min Vapi orchestration fee on Build plan; model and voice costs passed at cost
  sources:
  - https://vapi.ai/pricing
  - https://docs.vapi.ai
  - https://api.vapi.ai/api
  - https://github.com/VapiAI
  - https://status.vapi.ai
  updated: '2026-05-24'
created: '2026-05-24T00:00:00.000Z'
modified: '2026-05-24'
position: Consuming
description: Vapi is a San Francisco-based voice AI platform that lets developers build real-time, low-latency
  voice agents over phone, web, and SIP. It orchestrates three modular components — a transcriber (STT), an
  LLM, and a voice (TTS) — into a sub-700ms voice-to-voice pipeline, with first-class support for tools/function
  calling, multi-agent squads, outbound campaigns, persistent sessions, structured outputs, recording artifacts,
  evaluation scorecards, and a full REST API plus official SDKs in TypeScript, Python, C#, Ruby, PHP, and
  client SDKs for Web, React Native, iOS, and Python. Vapi is a Y Combinator company.
maintainers:
- FN: Kin Lane
  email: [email protected]
  X: apievangelist
  url: https://apievangelist.com
specificationVersion: '0.16'