aid: clicksend-sms
name: ClickSend SMS
description: >-
  ClickSend is a global business communications platform for sending and
  receiving SMS, MMS, voice, email, fax, and physical post via API or web
  dashboard, with direct carrier routing and a 99.95% uptime SLA. The
  ClickSend REST API v3 provides endpoints for SMS, MMS, voice, email, fax,
  post letters, contacts, accounts, and webhooks, secured with HTTP Basic
  Authentication using a username and API key.
type: Index
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - SMS
  - MMS
  - Messaging
  - Voice
  - Email
  - Fax
  - Direct Mail
  - Communications
url: >-
  https://raw.githubusercontent.com/api-evangelist/clicksend-sms/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.19'
apis:
  - aid: clicksend-sms:rest-api-v3
    name: ClickSend REST API v3
    description: >-
      REST API v3 for ClickSend covering SMS, MMS, voice broadcasts, email,
      fax, post letters and postcards, contact lists, accounts, subaccounts,
      and webhook subscriptions. Authentication uses HTTP Basic Auth with
      account username and API key. An OpenAPI/Swagger specification is
      published in the official ClickSend SDK repositories on GitHub.
    humanURL: https://developers.clicksend.com/docs/
    baseURL: https://rest.clicksend.com/v3
    tags:
      - SMS
      - MMS
      - Voice
      - Email
      - Fax
      - Post
      - Contacts
      - Basic Auth
    properties:
      - type: Documentation
        url: https://developers.clicksend.com/docs/
      - type: OpenAPI
        url: https://raw.githubusercontent.com/ClickSend/clicksend-go/master/api/swagger.yaml
      - type: API Portal
        url: https://developers.clicksend.com/
      - type: GitHub Organization
        url: https://github.com/ClickSend

common:
  - type: Website
    url: https://www.clicksend.com
  - type: Documentation
    url: https://developers.clicksend.com/
  - type: Pricing
    url: https://www.clicksend.com/en/pricing/
  - type: Sign Up
    url: https://dashboard.clicksend.com/signup
  - type: Knowledge Base
    url: https://help.clicksend.com
  - type: Integrations
    url: https://integrations.clicksend.com/
  - type: Blog
    url: https://blog.clicksend.com
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com