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 Artificial Intelligence.

Respond.io’s developer surface includes authentication, documentation, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.3/100 developing ▬ flat Agent 25/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessPaid

1 APIs

Messaging OmnichannelCustomer ConversationsWhatsApp Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 43.3/100 · developing

Contract Quality 13.5 / 23

Developer Ergonomics 5.8 / 18

Access Clarity 8.5 / 18

Operational Transparency 3.7 / 12

Contract Governance 0.0 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. 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. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 6

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

Respond.io Comments API

Internal collaboration comments on a contact.

Respond.io Contacts API

Create, read, update, merge, list, and delete contacts.

Respond.io Conversations API

Open, close, status, and assign conversations.

Respond.io Custom Fields API

Structured contact metadata definitions.

Respond.io Messages API

Send messages to contacts and read message history.

Respond.io Tags API

Workspace tags and contact tag assignment.

Open Collections 8

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Respond.io Developer Comments API

OPEN COLLECTION

Respond.io Developer Comments Contacts API

OPEN COLLECTION

Respond.io Developer Comments Conversations API

OPEN COLLECTION

Respond.io Developer Comments Custom Fields API

OPEN COLLECTION

Respond.io Developer Comments Messages API

OPEN COLLECTION

Respond.io Developer Comments Tags API

OPEN COLLECTION

Respond.io Developer API

OPEN COLLECTION

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Respond Plans Pricing

4 plans

PLANS

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.

Respond Finops

FINOPS

Security Posture 3

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

Respond Authentication

http · 1 scheme

SECURITY

Respond Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Respond Trust Center

ISO 27001, GDPR

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Respond Agentic Access

20 operations · 15 acting

AGENTIC

Resources

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

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

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.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/respond.png
tags:
- Messaging
- Omnichannel
- Customer Conversations
- WhatsApp
- Artificial Intelligence
tags_raw:
- Messaging
- Omnichannel
- Customer Conversations
- WhatsApp
- AI
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.23'
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:
  - Message
  tags_raw:
  - 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: CapabilityMap
  url: capabilities/respond-capability-edges.yml
  name: Respond.io Business Capability Map
- 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

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