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 APIs 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 📡 Source on GitHub

39.1/100 thin ▬ flat Agent 21/100 agent aware Full breakdown ↓
scored 2026-08-24 · rubric v0.13.0

AccessFreemiumSelf serveFree trial⚡ Free to try

6 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-08-24 · rubric v0.13.0

Composite quality — 39.1/100 · thin

Contract Quality 13.2 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 6.7 / 17

Operational Transparency 3.5 / 11

Contract Governance 1.2 / 10

Discoverability 6.3 / 9

Regulatory Posture 2.5 / 15

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

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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/exotel: 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.

Exotel Rate Limits

5 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 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.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  label: Freemium (free trial) · 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/exotel.png
tags:
- Cloud Telephony
- Voice
- SMS
- India
- CPaaS
- Call Center
- IVR
- Numbers
- Communications
- Customer Engagement
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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