Respond.io

Respond.io is an AI-powered customer-conversation management platform that unifies omnichannel messaging - WhatsApp, Messenger, Instagram, Telegram, SMS, email, and website chat - into a single inbox. Its REST Developer API lets businesses manage contacts, send and read messages across channels, manage conversations, post comments, apply tags and custom fields, and subscribe to webhooks.

Respond.io publishes 6 APIs on the APIs.io network, including Comments API, Contacts API, Conversations API, and 3 more. Tagged areas include Messaging, Omnichannel, Customer Conversations, WhatsApp, and AI.

Respond.io’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

38.1/100 thin ▼ -5.2 Agent 37/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessPaidSelf serve

6 APIs

MessagingOmnichannelCustomer ConversationsWhatsAppAI

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 38.1/100 · thin

Contract Quality 15.3 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 9.5 / 20

Operational Transparency 4.1 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

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/respond: 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 6

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

Rate Limits 1

Documented rate limits and quota policies.

Respond Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: respond
url: https://raw.githubusercontent.com/api-evangelist/respond/refs/heads/main/apis.yml
name: Respond.io
kind: company
description: Respond.io is an AI-powered customer-conversation management platform that unifies omnichannel messaging - WhatsApp,
  Messenger, Instagram, Telegram, SMS, email, and website chat - into a single inbox. Its REST Developer API lets businesses
  manage contacts, send and read messages across channels, manage conversations, post comments, apply tags and custom fields,
  and subscribe to webhooks.
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/respond.png
tags:
- Messaging
- Omnichannel
- Customer Conversations
- WhatsApp
- AI
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: respond:respond-comments-api
  name: Respond.io Comments API
  description: Internal collaboration comments on a contact.
  humanURL: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  baseURL: https://api.respond.io/v2
  tags:
  - Comments
  properties:
  - type: OpenAPI
    url: openapi/respond-comments-api-openapi.yml
  - type: Documentation
    url: https://developers.respond.io/
  - type: APIReference
    url: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  - type: PostmanCollection
    url: collections/respond.postman_collection.json
  - type: APIReference
    url: https://developers.respond.io/docs/api/42fc125b57906-messaging
  - type: APIReference
    url: https://developers.respond.io/docs/api/fd927d6437cf5-conversation
  - type: Review
    url: review.yml
- aid: respond:respond-contacts-api
  name: Respond.io Contacts API
  description: Create, read, update, merge, list, and delete contacts.
  humanURL: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  baseURL: https://api.respond.io/v2
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/respond-contacts-api-openapi.yml
  - type: Documentation
    url: https://developers.respond.io/
  - type: APIReference
    url: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  - type: PostmanCollection
    url: collections/respond.postman_collection.json
  - type: APIReference
    url: https://developers.respond.io/docs/api/42fc125b57906-messaging
  - type: APIReference
    url: https://developers.respond.io/docs/api/fd927d6437cf5-conversation
  - type: Review
    url: review.yml
- aid: respond:respond-conversations-api
  name: Respond.io Conversations API
  description: Open, close, status, and assign conversations.
  humanURL: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  baseURL: https://api.respond.io/v2
  tags:
  - Conversations
  properties:
  - type: OpenAPI
    url: openapi/respond-conversations-api-openapi.yml
  - type: Documentation
    url: https://developers.respond.io/
  - type: APIReference
    url: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  - type: PostmanCollection
    url: collections/respond.postman_collection.json
  - type: APIReference
    url: https://developers.respond.io/docs/api/42fc125b57906-messaging
  - type: APIReference
    url: https://developers.respond.io/docs/api/fd927d6437cf5-conversation
  - type: Review
    url: review.yml
- aid: respond:respond-custom-fields-api
  name: Respond.io Custom Fields API
  description: Structured contact metadata definitions.
  humanURL: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  baseURL: https://api.respond.io/v2
  tags:
  - Custom Fields
  properties:
  - type: OpenAPI
    url: openapi/respond-custom-fields-api-openapi.yml
  - type: Documentation
    url: https://developers.respond.io/
  - type: APIReference
    url: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  - type: PostmanCollection
    url: collections/respond.postman_collection.json
  - type: APIReference
    url: https://developers.respond.io/docs/api/42fc125b57906-messaging
  - type: APIReference
    url: https://developers.respond.io/docs/api/fd927d6437cf5-conversation
  - type: Review
    url: review.yml
- aid: respond:respond-messages-api
  name: Respond.io Messages API
  description: Send messages to contacts and read message history.
  humanURL: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  baseURL: https://api.respond.io/v2
  tags:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/respond-messages-api-openapi.yml
  - type: Documentation
    url: https://developers.respond.io/
  - type: APIReference
    url: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  - type: PostmanCollection
    url: collections/respond.postman_collection.json
  - type: APIReference
    url: https://developers.respond.io/docs/api/42fc125b57906-messaging
  - type: APIReference
    url: https://developers.respond.io/docs/api/fd927d6437cf5-conversation
  - type: Review
    url: review.yml
- aid: respond:respond-tags-api
  name: Respond.io Tags API
  description: Workspace tags and contact tag assignment.
  humanURL: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  baseURL: https://api.respond.io/v2
  tags:
  - Tags
  properties:
  - type: OpenAPI
    url: openapi/respond-tags-api-openapi.yml
  - type: Documentation
    url: https://developers.respond.io/
  - type: APIReference
    url: https://developers.respond.io/docs/api/c6e1aa937640e-contact
  - type: PostmanCollection
    url: collections/respond.postman_collection.json
  - type: APIReference
    url: https://developers.respond.io/docs/api/42fc125b57906-messaging
  - type: APIReference
    url: https://developers.respond.io/docs/api/fd927d6437cf5-conversation
  - type: Review
    url: review.yml
common:
- type: AgenticAccess
  url: agentic-access/respond-agentic-access.yml
- type: TrustCenter
  url: security/respond-trust-center.yml
- type: DomainSecurity
  url: security/respond-domain-security.yml
- type: Authentication
  url: authentication/respond-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/respond-io
- type: Website
  url: https://respond.io/
- type: Documentation
  url: https://developers.respond.io/
- type: Plans
  url: plans/respond-plans-pricing.yml
- type: RateLimits
  url: rate-limits/respond-rate-limits.yml
- type: FinOps
  url: finops/respond-finops.yml
- url: https://respond.io/blog/rss.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Respond.io

Kin Score

APIs 6

Respond.io Comments API

Respond.io Contacts API

Respond.io Conversations API

Respond.io Custom Fields API

Respond.io Messages API

Respond.io Tags API

Open Collections 1

Respond.io Developer API

Pricing Plans 1

Respond Plans Pricing

Rate Limits 1

Respond Rate Limits

FinOps 1

Respond Finops

Security Posture 3

Respond Authentication

Respond Domain Security

Respond Trust Center

Agentic Access 1

Respond Agentic Access

Resources