Quo

Quo (formerly OpenPhone) is an AI-powered business communication platform that unifies calls, texts, and contacts in one shared workspace for startups and small businesses. Its REST Public API (https://api.quo.com/v1) lets developers send and receive SMS, manage contacts, conversations, and tasks, retrieve AI-generated call summaries and transcripts, and subscribe to Standard-Webhooks-signed events for messages and calls. Authentication is via a workspace API key sent in the Authorization header. This profile was added to the API Evangelist network from VC portfolio discovery and enriched from Quo's live developer documentation and published OpenAPI.

Quo publishes 9 APIs on the APIs.io network, including Calls API, Contact Custom Fields API, Contacts API, and 6 more. Tagged areas include Company, Communication, Messaging, SMS, and Voice.

The Quo catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Quo’s developer surface includes documentation, API reference, getting-started guide, support, pricing, changelog, authentication, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub
51.6/100 developing ▬ flat Agent 49/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
9 APIs 1 MCP Servers
CompanyCommunicationMessagingSMSVoiceContactsWebhooksAPI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 51.6/100 · developing
Contract Quality 17.1 / 25
Developer Ergonomics 13.0 / 20
Commercial Clarity 7.4 / 20
Operational Transparency 4.1 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 49/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/quo: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Quo Calls API

Operations related to calls

Quo Contact Custom Fields API

The Contact Custom Fields API from Quo — 1 operation(s) for contact custom fields.

Quo Contacts API

Operations related to contacts

Quo Conversations API

Operations related to conversations

Quo Messages API

Operations related to text messages

Quo Phone Numbers API

Operations related to phone numbers

Quo Tasks API

The Tasks API from Quo — 10 operation(s) for tasks.

Quo Users API

Operations related to users

Quo Webhooks API

Operations related to webhooks

Scroll for all 9

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

quo-mcp.yml

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Quo Webhooks

ASYNCAPI

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Quo Authentication

apiKey · 1 scheme

SECURITY

Quo Domain Security

TLSv1.3 · DMARC

SECURITY

Quo Trust Center

SOC 2, HIPAA, GDPR

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 Webhooks
Webhooks

Access & Security 4

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity
 TrustCenter
TrustCenter
 Compliance
Compliance

Operate 3

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog
 Deprecation
Deprecation

Commercial 2

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: quo
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/quo.png
name: Quo
description: Quo (formerly OpenPhone) is an AI-powered business communication platform that unifies calls, texts, and contacts
  in one shared workspace for startups and small businesses. Its REST Public API (https://api.quo.com/v1) lets developers
  send and receive SMS, manage contacts, conversations, and tasks, retrieve AI-generated call summaries and transcripts, and
  subscribe to Standard-Webhooks-signed events for messages and calls. Authentication is via a workspace API key sent in the
  Authorization header. This profile was added to the API Evangelist network from VC portfolio discovery and enriched from
  Quo's live developer documentation and published OpenAPI.
url: https://raw.githubusercontent.com/api-evangelist/quo/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- craft-ventures
- general-catalyst
- kindred-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Communication
- Messaging
- SMS
- Voice
- Contacts
- Webhooks
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: quo:quo-calls-api
  name: Quo Calls API
  description: Operations related to calls
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Calls
  properties:
  - type: OpenAPI
    url: openapi/quo-calls-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-contact-custom-fields-api
  name: Quo Contact Custom Fields API
  description: The Contact Custom Fields API from Quo — 1 operation(s) for contact custom fields.
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Contact Custom Fields
  properties:
  - type: OpenAPI
    url: openapi/quo-contact-custom-fields-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-contacts-api
  name: Quo Contacts API
  description: Operations related to contacts
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/quo-contacts-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-conversations-api
  name: Quo Conversations API
  description: Operations related to conversations
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Conversations
  properties:
  - type: OpenAPI
    url: openapi/quo-conversations-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-messages-api
  name: Quo Messages API
  description: Operations related to text messages
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/quo-messages-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-phone-numbers-api
  name: Quo Phone Numbers API
  description: Operations related to phone numbers
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Phone Numbers
  properties:
  - type: OpenAPI
    url: openapi/quo-phone-numbers-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-tasks-api
  name: Quo Tasks API
  description: The Tasks API from Quo — 10 operation(s) for tasks.
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/quo-tasks-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-users-api
  name: Quo Users API
  description: Operations related to users
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/quo-users-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
- aid: quo:quo-webhooks-api
  name: Quo Webhooks API
  description: Operations related to webhooks
  humanURL: https://www.quo.com/api
  baseURL: https://api.quo.com
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/quo-webhooks-api-openapi.yml
  - type: APIReference
    url: https://www.quo.com/docs/mdx/api-reference/introduction
  - type: Documentation
    url: https://www.quo.com/docs
  - type: GettingStarted
    url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
  - type: Authentication
    url: authentication/quo-authentication.yml
  - type: Conventions
    url: conventions/quo-conventions.yml
  - type: ErrorCatalog
    url: errors/quo-problem-types.yml
  - type: DataModel
    url: data-model/quo-data-model.yml
  - type: Webhooks
    url: asyncapi/quo-webhooks.yml
  - type: Lifecycle
    url: lifecycle/quo-lifecycle.yml
  - type: ChangeLog
    url: changelog/quo-changelog.yml
common:
- type: Website
  url: https://quo.com
- type: DeveloperPortal
  url: https://www.quo.com/docs
- type: Documentation
  url: https://www.quo.com/docs
- type: APIReference
  url: https://www.quo.com/docs/mdx/api-reference/introduction
- type: GettingStarted
  url: https://www.quo.com/docs/mdx/api-reference/send-your-first-message
- type: Support
  url: https://support.quo.com
- type: Pricing
  url: https://www.quo.com/docs/mdx/pricing-support/pricing-overview
- type: TermsOfService
  url: https://www.quo.com/docs/mdx/pricing-support/terms-of-service
- type: ChangeLog
  url: https://support.quo.com/changelog
- type: LLMsTxt
  url: llms/quo-llms.txt
- type: Authentication
  url: authentication/quo-authentication.yml
- type: Conformance
  url: conformance/quo-conformance.yml
- type: DomainSecurity
  url: security/quo-domain-security.yml
- type: TrustCenter
  url: security/quo-trust-center.yml
- type: Compliance
  url: security/quo-trust-center.yml
- type: Deprecation
  url: lifecycle/quo-lifecycle.yml
- type: Webhooks
  url: asyncapi/quo-webhooks.yml
- type: MCPServer
  url: mcp/quo-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 16
  pass: local-v1