Exotel website screenshot

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
41.7/100 thin ▬ flat Agent 32/100 agent aware Full breakdown ↓
scored 2026-08-03 · rubric v0.9
AccessFreemiumSelf serveFree trial⚡ Free to try
6 APIs
Cloud TelephonyVoiceSMSIndiaCPaaSCall CenterIVRNumbersCommunicationsCustomer Engagement

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-03 · rubric v0.9
Composite quality — 41.7/100 · thin
Contract Quality 17.4 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.1 / 13
Governance 5.0 / 12
Discoverability 7.4 / 10
Agent readiness — 32/100 · agent aware
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 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
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.

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 1

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

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 API 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

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
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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: '0.19'
apis:
- aid: exotel:exotel-agentstream-voice-streaming-api
  name: Exotel AgentStream Voice Streaming API
  tags:
  - 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
Where this information came from

This is an independent, third-party profile of Exotel, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.