# Vapi

**Canonical:** https://apis.io/providers/vapi-ai/  
**Website:** https://vapi.ai  
**APIs profiled:** 15

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.

## Kin Score — 74.9 / 100 (exemplar)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 74.9).

| Facet | Score |
|---|---|
| Discoverability | 77.8 |
| Contract Quality | 77.7 |
| Governance | 30.3 |
| Contract Governance | 30.3 |
| Operational Transparency | 76.3 |
| Developer Ergonomics | 78.6 |
| Commercial Clarity | 92.1 |
| Access Clarity | 92.1 |

## Agent readiness — 48.9 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | verified |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | documented |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | no |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Paid · Self-serve signup — onboarding: self-serve, pricing: paid, trial: no (confidence: high).

## APIs (15)

- **Vapi Analytics API** — Analytics endpoints.
- **Vapi Assistants API** — Assistants endpoints.
- **Vapi Calls API** — Calls endpoints.
- **Vapi Campaigns API** — Campaigns endpoints.
- **Vapi Chats API** — Chats endpoints.
- **Vapi Eval API** — Eval endpoints.
- **Vapi Files API** — Files endpoints.
- **Vapi Insight API** — Insight endpoints.
- **Vapi Observability/Scorecard API** — Observability/Scorecard endpoints.
- **Vapi Phone Numbers API** — Phone Numbers endpoints.
- **Vapi Provider Resources API** — Provider Resources endpoints.
- **Vapi Sessions API** — Sessions endpoints.
- **Vapi Squads API** — Squads endpoints.
- **Vapi Structured Outputs API** — Structured Outputs endpoints.
- **Vapi Tools API** — Tools endpoints.

## MCP servers (1)

- **Vapi MCP Server**

## Agentic access (1)

- **Vapi Ai Agentic Access** — 86 operations · 48 acting · 48 human-in-the-loop

## Security (3)

- **Vapi Ai Authentication** — http · 1 scheme
- **Vapi Ai Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Vapi Ai Trust Center** — SOC 2, PCI DSS, GDPR

## Plans (1)

- **Vapi Ai Plans Pricing**

## Tags

Artificial Intelligence, Voice AI, Voice Agents, Conversational AI, Telephony, Real-Time, Transcription, Text-to-Speech, LLM, Agents, MCP

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/vapi-ai/). Scores are computed from the provider's own public artifacts under a published rubric.