Exotel

Exotel is an Indian cloud telephony and customer-engagement (CPaaS) platform offering programmable voice, SMS, virtual numbers (ExoPhones), IVR/call flows, call campaigns, and call-center tooling. Its Twilio-style REST APIs place outbound calls (connect two numbers or connect a number to a call flow), send SMS, return call and number metadata, and manage campaigns, over region-specific subdomains (api.exotel.com for Singapore, api.in.exotel.com for Mumbai/India) using HTTP Basic auth with an API Key and API Token. Exotel AgentStream adds a documented WebSocket voice-streaming API for real-time voicebots.

Exotel publishes 6 API contracts indexed on the APIs.io network, including AgentStream Voice Streaming API, Call Details API, Campaigns API, and 3 more. Tagged areas include Cloud Telephony, Voice, SMS, India, and CPaaS.

The Exotel catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Exotel’s developer surface includes authentication, documentation, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.8/100 thin ▬ flat Agent 21/100 agent aware Front door AI 6/6 dominant saas Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessFreemiumSelf serveFree trial⚡ Free to try

1 published contract

Cloud Telephony Voice SMS India CPaaS Call Center IVR Numbers Communications Customer Engagement Real-Time

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 28.8/100 · thin

Contract Quality 10.6 / 19

Developer Ergonomics 4.8 / 15

Access Clarity 1.2 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · 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 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Telecommunications 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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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/exotel: 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Customer Support, Helpdesk and Contact Center	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 6

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

Exotel AgentStream Voice Streaming API

Documented WebSocket (wss://) voice-streaming API. When a call reaches a Voicebot or Stream applet, Exotel opens a secure WebSocket to your endpoint and streams base64 linear-PC...

Exotel Call Details API

Retrieve details of past and in-progress calls.

Exotel Campaigns API

Create and manage bulk outbound call campaigns (v2).

Exotel Numbers API

Look up telecom metadata for phone numbers.

Exotel SMS API

Send SMS and retrieve message details.

Exotel Voice API

Place and control outbound voice calls.

Open Collections 6

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

Exotel Call Details API

OPEN COLLECTION

Exotel Call Details Campaigns API

OPEN COLLECTION

Exotel Call Details Numbers API

OPEN COLLECTION

Exotel Call Details SMS API

OPEN COLLECTION

Exotel Call Details Voice API

OPEN COLLECTION

Exotel API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Exotel Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Exotel Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Exotel Finops

FINOPS

Event Specifications 1

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

Exotel AgentStream Voice Streaming API

Exotel AgentStream (also surfaced through the Voicebot and Stream applets) is a documented public WebSocket API for real-time voice media streaming during a call. When a call hi...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Exotel — asyncapi rules

5 rules · 1 errors 4 warnings

SPECTRAL

Security Posture 2

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

Exotel Authentication

http · 1 scheme

SECURITY

Exotel Domain Security

HSTS · DMARC

SECURITY

Agentic Access 1

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

Exotel Agentic Access

12 operations · 5 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 2

Authentication, authorization, and security posture

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: exotel
url: https://raw.githubusercontent.com/api-evangelist/exotel/refs/heads/main/apis.yml
name: Exotel
kind: company
description: Exotel is an Indian cloud telephony and customer-engagement (CPaaS) platform offering programmable voice, SMS,
  virtual numbers (ExoPhones), IVR/call flows, call campaigns, and call-center tooling. Its Twilio-style REST APIs place outbound
  calls (connect two numbers or connect a number to a call flow), send SMS, return call and number metadata, and manage campaigns,
  over region-specific subdomains (api.exotel.com for Singapore, api.in.exotel.com for Mumbai/India) using HTTP Basic auth
  with an API Key and API Token. Exotel AgentStream adds a documented WebSocket voice-streaming API for real-time voicebots.
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: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  label: Freemium (free trial) · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/exotel.png
tags:
- Cloud Telephony
- Voice
- SMS
- India
- CPaaS
- Call Center
- IVR
- Numbers
- Communications
- Customer Engagement
- Real-Time
created: '2026-07-12'
modified: '2026-07-12'
specificationVersion: '0.23'
apis:
- aid: exotel:exotel-agentstream-voice-streaming-api
  name: Exotel AgentStream Voice Streaming API
  tags:
  - WebSocket
  - Voice Streaming
  - Voicebot
  - Real-Time
  tags_raw:
  - WebSocket
  - Voice Streaming
  - Voicebot
  - Real Time
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developer.exotel.com/docs/agentstream/developer-guide
  baseURL: wss://your-bot-host.example.com
  properties:
  - url: https://developer.exotel.com/docs/agentstream/developer-guide
    type: Documentation
  - url: asyncapi/exotel-asyncapi.yml
    type: AsyncAPI
  description: Documented WebSocket (wss://) voice-streaming API. When a call reaches a Voicebot or Stream applet, Exotel
    opens a secure WebSocket to your endpoint and streams base64 linear-PCM audio in ~100 ms frames (connected/start/media/dtmf/mark/stop);
    the Voicebot applet is bidirectional so your server sends media/mark/clear back to speak to the caller and barge in. Exotel
    is the WebSocket client; you host the endpoint.
- aid: exotel:exotel-call-details-api
  name: Exotel Call Details API
  description: Retrieve details of past and in-progress calls.
  humanURL: https://developer.exotel.com/api/make-a-call-api
  baseURL: https://api.exotel.com/v1/Accounts
  tags:
  - Call Details
  properties:
  - type: OpenAPI
    url: openapi/exotel-call-details-api-openapi.yml
  - type: Documentation
    url: https://developer.exotel.com/api/make-a-call-api
  - type: APIReference
    url: https://developer.exotel.com/api/make-a-call-api
  - type: PostmanCollection
    url: collections/exotel.postman_collection.json
  - type: OpenCollection
    url: collections/exotel.opencollection.json
  - type: Documentation
    url: https://developer.exotel.com/api
  - type: Documentation
    url: https://developer.exotel.com/api/sms
  - type: APIReference
    url: https://developer.exotel.com/docs/sms-api/api-reference/send-sms
- aid: exotel:exotel-campaigns-api
  name: Exotel Campaigns API
  description: Create and manage bulk outbound call campaigns (v2).
  humanURL: https://developer.exotel.com/api/make-a-call-api
  baseURL: https://api.exotel.com/v1/Accounts
  tags:
  - Campaigns
  properties:
  - type: OpenAPI
    url: openapi/exotel-campaigns-api-openapi.yml
  - type: Documentation
    url: https://developer.exotel.com/api/make-a-call-api
  - type: APIReference
    url: https://developer.exotel.com/api/make-a-call-api
  - type: PostmanCollection
    url: collections/exotel.postman_collection.json
  - type: OpenCollection
    url: collections/exotel.opencollection.json
  - type: Documentation
    url: https://developer.exotel.com/api
  - type: Documentation
    url: https://developer.exotel.com/api/sms
  - type: APIReference
    url: https://developer.exotel.com/docs/sms-api/api-reference/send-sms
- aid: exotel:exotel-numbers-api
  name: Exotel Numbers API
  description: Look up telecom metadata for phone numbers.
  humanURL: https://developer.exotel.com/api/make-a-call-api
  baseURL: https://api.exotel.com/v1/Accounts
  tags:
  - Numbers
  properties:
  - type: OpenAPI
    url: openapi/exotel-numbers-api-openapi.yml
  - type: Documentation
    url: https://developer.exotel.com/api/make-a-call-api
  - type: APIReference
    url: https://developer.exotel.com/api/make-a-call-api
  - type: PostmanCollection
    url: collections/exotel.postman_collection.json
  - type: OpenCollection
    url: collections/exotel.opencollection.json
  - type: Documentation
    url: https://developer.exotel.com/api
  - type: Documentation
    url: https://developer.exotel.com/api/sms
  - type: APIReference
    url: https://developer.exotel.com/docs/sms-api/api-reference/send-sms
- aid: exotel:exotel-sms-api
  name: Exotel SMS API
  description: Send SMS and retrieve message details.
  humanURL: https://developer.exotel.com/api/make-a-call-api
  baseURL: https://api.exotel.com/v1/Accounts
  tags:
  - SMS
  properties:
  - type: OpenAPI
    url: openapi/exotel-sms-api-openapi.yml
  - type: Documentation
    url: https://developer.exotel.com/api/make-a-call-api
  - type: APIReference
    url: https://developer.exotel.com/api/make-a-call-api
  - type: PostmanCollection
    url: collections/exotel.postman_collection.json
  - type: OpenCollection
    url: collections/exotel.opencollection.json
  - type: Documentation
    url: https://developer.exotel.com/api
  - type: Documentation
    url: https://developer.exotel.com/api/sms
  - type: APIReference
    url: https://developer.exotel.com/docs/sms-api/api-reference/send-sms
- aid: exotel:exotel-voice-api
  name: Exotel Voice API
  description: Place and control outbound voice calls.
  humanURL: https://developer.exotel.com/api/make-a-call-api
  baseURL: https://api.exotel.com/v1/Accounts
  tags:
  - Voice
  properties:
  - type: OpenAPI
    url: openapi/exotel-voice-api-openapi.yml
  - type: Documentation
    url: https://developer.exotel.com/api/make-a-call-api
  - type: APIReference
    url: https://developer.exotel.com/api/make-a-call-api
  - type: PostmanCollection
    url: collections/exotel.postman_collection.json
  - type: OpenCollection
    url: collections/exotel.opencollection.json
  - type: Documentation
    url: https://developer.exotel.com/api
  - type: Documentation
    url: https://developer.exotel.com/api/sms
  - type: APIReference
    url: https://developer.exotel.com/docs/sms-api/api-reference/send-sms
common:
- type: AgenticAccess
  url: agentic-access/exotel-agentic-access.yml
- type: DomainSecurity
  url: security/exotel-domain-security.yml
- type: Authentication
  url: authentication/exotel-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/exotel
- type: Website
  url: https://exotel.com
- type: Documentation
  url: https://developer.exotel.com
- type: Plans
  url: plans/exotel-plans-pricing.yml
- type: RateLimits
  url: rate-limits/exotel-rate-limits.yml
- type: FinOps
  url: finops/exotel-finops.yml
- url: https://exotel.com/blog/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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