ClickSend SMS

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.

ClickSend SMS publishes 1 API on the APIs.io network: Sms API. Tagged areas include SMS, MMS, Messaging, Voice, and Email.

ClickSend SMS’s developer surface includes authentication, documentation, pricing, signup flow, engineering blog, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub

26.1/100 emerging ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessSelf serve

1 APIs

SMSMMSMessagingVoiceEmailFaxDirect MailCommunications

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 26.1/100 · emerging

Contract Quality 11.7 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 3.7 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.9 / 10

Agent readiness — 28/100 · 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 0 / 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

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/clicksend-sms: 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 1

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

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

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

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Knowledge Base

Knowledge Base

Source (apis.yml)

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
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/clicksend-sms.png
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:clicksend-sms-sms-api
  name: ClickSend SMS Sms API
  description: The Sms API from ClickSend SMS — 6 operation(s) for sms.
  humanURL: https://developers.clicksend.com/docs/
  baseURL: https://rest.clicksend.com/v3
  tags:
  - Sms
  properties:
  - type: OpenAPI
    url: openapi/clicksend-sms-sms-api-openapi.yml
  - type: Documentation
    url: https://developers.clicksend.com/docs/
  - type: API Portal
    url: https://developers.clicksend.com/
  - type: GitHubOrganization
    url: https://github.com/ClickSend
common:
- type: AgenticAccess
  url: agentic-access/clicksend-sms-agentic-access.yml
- type: TrustCenter
  url: security/clicksend-sms-trust-center.yml
- type: DomainSecurity
  url: security/clicksend-sms-domain-security.yml
- type: Authentication
  url: authentication/clicksend-sms-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/clicksend
- type: Website
  url: https://www.clicksend.com
- type: Documentation
  url: https://developers.clicksend.com/
- type: Pricing
  url: https://www.clicksend.com/en/pricing/
- type: Signup
  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

ClickSend SMS

Kin Score

APIs 1

ClickSend SMS Sms API

Open Collections 1

ClickSend SMS REST API v3

Security Posture 3

Clicksend Sms Authentication

Clicksend Sms Domain Security

Clicksend Sms Trust Center

Agentic Access 1

Clicksend Sms Agentic Access

Resources