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 API contracts indexed 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.

The Respond.io catalog on APIs.io includes 1 Spectral governance ruleset.

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

🌐 Visit website 📡 Profile data on GitHub

39.7/100 developing ▬ flat Agent 26/100 agent aware Front door AI 6/6 dominant Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract

Messaging OmnichannelCustomer ConversationsWhatsApp Artificial Intelligence

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Customer Service Management

BC-430

ConversationsMessages

POST /contact/{identifier}/conversation POST /contact/{identifier}/conversation/assignee POST /contact/{identifier}/message

Customer Relationship Management

BC-420

Contacts

POST /contact GET /contact/list POST /contact/merge

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 39.7/100 · developing

Contract Quality 10.1 / 19

Developer Ergonomics 4.8 / 15

Access Clarity 6.7 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.3 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 26/100 · 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 32.1 — up to +13.6 composite points
Operational Transparency scores 7.9 — up to +12.0 composite points
Contract Quality scores 54.1 — up to +11.5 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/respond/apis.yml: open an issue on github.com/api-evangelist/respond to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 7

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

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 7

Respond.io API pricing

Prices published by Respond.io, read 2026-09-20 from respond.io/pricing.

Plan	Price
starter	99 Includes: 5 Users; Team & Custom Inboxes, Mobile App, AI Prompt, AI Assist, Basic Reports, Two-Factor Authenti
growth	199 Includes: 10 Users; Everything in Starter, plus: Broadcasts, Workflows automation, AI Agents, Advanced Reports
advanced	349 Includes: Everything in Growth, plus: Mask Phone Number & Email Address, Multiple Workspaces, HTTP Requests in
Enterprise	Custom Includes: Everything in Advanced, Plus: Unlimited Users, Higher limit of workspaces, Higher API rate limits

Plan details, limits and sources →

Rate limits

Requests Per Second (per method): 5 requests
Channel Messaging Limits: see channel provider documentation messages
Enterprise API Limits: negotiated requests

Compiled by API Evangelist, not yet checked against Respond.io's documentation. Rate-limit details →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Respond.io

SLA

FinOps 1

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

Respond Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Respond.io API Rules

63 rules · 60 errors 2 warnings 1 info

SPECTRAL

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 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

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: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/respond.png
x-docs-platform: stoplight
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
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: Pricing
  url: https://respond.io/pricing
- 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

Respond.io API — frequently asked questions

Does Respond.io have an API?

Yes. APIs.io lists 6 APIs from Respond.io, including Respond.io Comments API, Respond.io Contacts API and Respond.io Conversations API, and 3 more.

Is there an OpenAPI specification for the Respond.io API?

Yes. APIs.io indexes 6 OpenAPI specifications for Respond.io, each linked for download from this page.

How do I authenticate with the Respond.io API?

Respond.io uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Respond Authentication.

How much does the Respond.io API cost?

Respond.io publishes its prices; its starter plan is 99 as of 2026-09-20. APIs.io lists 4 pricing plans for Respond.io, with each plan's price, limits and inclusions under Pricing on this page.

Is the Respond.io API ready for AI agents?

Respond.io has a Kin Score of 39.7 out of 100 (developing) and an Agent Readiness score of 25.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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