# OpenPhone

**Canonical:** https://apis.io/providers/openphone/  
**Website:** https://www.quo.com  
**APIs profiled:** 9

OpenPhone (rebranded to Quo in 2026) is a business phone and customer communications platform that provides shared phone numbers, calling, SMS/MMS texting, AI call summaries and transcripts, contacts, conversations, and tasks for teams. Its public REST API lets developers programmatically send messages, list and retrieve calls with recordings and voicemails, manage contacts and custom fields, manage conversations and tasks, look up phone numbers and users, and subscribe to webhooks for message and call events. The API uses API-key authentication in the Authorization header, returns JSON over HTTPS at https://api.quo.com, uses cursor-based pagination, and is rate limited to 10 requests per second. OpenPhone was surfaced as a portfolio company of 500 Global and profiled into the API Evangelist network.

## Kin Score — 51.6 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 51.6).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 71.4 |
| Governance | 20.8 |
| Operational Transparency | 39.5 |
| Developer Ergonomics | 53.8 |
| Commercial Clarity | 50.0 |

Regulatory layer — **Telecommunications**: 36.1 (matched via tags).

## Agent readiness — 44.4 (agent-ready)

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

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (9)

- **OpenPhone Calls API** — Operations related to calls
- **OpenPhone Contact Custom Fields API** — The Contact Custom Fields API from OpenPhone — 1 operation(s) for contact custom fields.
- **OpenPhone Contacts API** — Operations related to contacts
- **OpenPhone Conversations API** — Operations related to conversations
- **OpenPhone Messages API** — Operations related to text messages
- **OpenPhone Phone Numbers API** — Operations related to phone numbers
- **OpenPhone Tasks API** — The Tasks API from OpenPhone — 10 operation(s) for tasks.
- **OpenPhone Users API** — Operations related to users
- **OpenPhone Webhooks API** — Operations related to webhooks

## MCP servers (1)

- **openphone-mcp.yml**

## Security (3)

- **Openphone Authentication** — apiKey · 1 scheme
- **Openphone Domain Security** — TLSv1.3 · DMARC
- **Openphone Trust Center** — SOC 2, HIPAA, GDPR

## Tags

Company, Communications, Voice, SMS, Messaging, Telephony, Business Phone, CPaaS, Contact Center, Webhooks

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