# Vapi

**Canonical:** https://apis.io/providers/vapi/  
**Website:** https://vapi.ai/  
**APIs profiled:** 16

Vapi is a voice AI agents platform for building, testing, and deploying real-time voice agents across phone, web, and SIP. The Vapi REST API exposes assistants, calls, chats, campaigns, phone numbers, tools, files, squads, sessions, structured outputs, and analytics, plus server/client webhook events. A published OpenAPI spec is available at https://api.vapi.ai/api-json.

## Kin Score — 31.2 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 31.2).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 53.1 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 7.9 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

Regulatory layer — **Telecommunications**: 23.6 (matched via tags).

## Agent readiness — 29.1 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| 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 (16)

- **Vapi Webhooks API** — Server- and client-side webhook events emitted by Vapi during voice sessions, including end-of-call reports, transcripts, function calls, status updates, and tool invocations.
- **Vapi Analytics API** — The Analytics API from Vapi — 1 operation(s) for analytics.
- **Vapi Assistants API** — The Assistants API from Vapi — 2 operation(s) for assistants.
- **Vapi Calls API** — The Calls API from Vapi — 2 operation(s) for calls.
- **Vapi Campaigns API** — The Campaigns API from Vapi — 2 operation(s) for campaigns.
- **Vapi Chats API** — The Chats API from Vapi — 3 operation(s) for chats.
- **Vapi Eval API** — The Eval API from Vapi — 4 operation(s) for eval.
- **Vapi Files API** — The Files API from Vapi — 2 operation(s) for files.
- **Vapi Insight API** — The Insight API from Vapi — 4 operation(s) for insight.
- **Vapi Observability/Scorecard API** — The Observability/Scorecard API from Vapi — 2 operation(s) for observability/scorecard.
- **Vapi Phone Numbers API** — The Phone Numbers API from Vapi — 3 operation(s) for phone numbers.
- **Vapi Provider Resources API** — The Provider Resources API from Vapi — 2 operation(s) for provider resources.
- **Vapi Sessions API** — The Sessions API from Vapi — 2 operation(s) for sessions.
- **Vapi Squads API** — The Squads API from Vapi — 2 operation(s) for squads.
- **Vapi Structured Outputs API** — The Structured Outputs API from Vapi — 3 operation(s) for structured outputs.
- **Vapi Tools API** — The Tools API from Vapi — 2 operation(s) for tools.

## Agentic access (1)

- **Vapi Agentic Access** — 79 operations · 48 acting · 48 human-in-the-loop

## Security (3)

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

## Plans (1)

- **Vapi Plans Pricing**

## Tags

Artificial Intelligence, Voice, Agents, Real-Time, CPaaS

---

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