Clickatell
Clickatell is a chat commerce and CPaaS company offering SMS and WhatsApp messaging (One API), the SMS API, Chat 2 Pay payments-in-chat, and Chat Flow workflow APIs for businesses.
Clickatell publishes 8 API contracts indexed on the APIs.io network, including Chat 2 Pay API, Chat 2 Pay API Client Callbacks API, External Link Callback API, and 5 more. Tagged areas include Company, SMS, WhatsApp, Messaging, and CPaaS.
The Clickatell catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.
Clickatell’s developer surface includes getting-started guide, authentication, documentation, changelog, pricing, support, and 20 more developer resources.
What this lets a business do 3
Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →
Kin Score
Kin Score
How this is scored →scored 2026-11-06 · rubric v0.27.0
It updates itself when the score changes. Paste this where you link to your API docs:
<a href="https://apis.io/providers/clickatell/"><img src="https://apis.io/badge/clickatell/card.svg" alt="Clickatell on APIs.io — Kin Score by API Evangelist"></a>Other styles, a README pill and a shields.io endpoint are on the badge page.
- MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
- Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
- A2A Agent Card +8 pts — a2a/
-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 - Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
- Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
- Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
- Access Clarity scores 5.3 — up to +18.9 composite points
- Developer Ergonomics scores 36.9 — up to +12.6 composite points
- Operational Transparency scores 13.2 — up to +11.3 composite points
Standards implemented 1
Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
APIs 8
Individual APIs this provider publishes, each with its own machine-readable definition.
Clickatell Chat 2 Pay API
The Chat 2 Pay API API from Clickatell — 8 operation(s) for chat 2 pay api.
Clickatell Chat 2 Pay API Client Callbacks API
The Chat 2 Pay API Client Callbacks API from Clickatell — 3 operation(s) for chat 2 pay api client callbacks.
Clickatell External Link Callback API
The External Link Callback API from Clickatell — 1 operation(s) for external link callback.
Clickatell One API
The One API API from Clickatell — 6 operation(s) for one api.
Clickatell One API Client Callbacks API
Forward CompatibilityWhile the basic callback structure will remain constant: { "integrationId": "string", "integrationName": "string", "event": {} }There are constant additi
Clickatell SMS API
The SMS API API from Clickatell — 3 operation(s) for sms api.
Clickatell SMS Client Callbacks API
The SMS Client Callbacks API from Clickatell — 2 operation(s) for sms client callbacks.
Clickatell Wait for Callback API
The Wait for Callback API from Clickatell — 1 operation(s) for wait for callback.
Scroll for all 8
Semantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Clickatell Context
JSON-LDSpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
Clickatell API Rules
SPECTRALJSON Schema 24
Standalone JSON Schema definitions for this provider's data models.
DetailedWidgetConfigResponse
JSON SCHEMAExternallink
JSON SCHEMAOmniMediaUploadResponse
JSON SCHEMAOmniMessageListResponse
JSON SCHEMAOmniMessageStatusResponse
JSON SCHEMAOmniReplyCallbackRequest
JSON SCHEMAOmniStatusCallbackRequest
JSON SCHEMAPayByLinkRequest
JSON SCHEMAPayByLinkTransactionLogResponse
JSON SCHEMAPaymentGatewayOperationResultResponse
JSON SCHEMAPaymentReceiptResponse
JSON SCHEMAReplyStatusNotificationRequest
JSON SCHEMASendBulkMessageRequest
JSON SCHEMASendMessageRequest
JSON SCHEMASendMessagesListResponse
JSON SCHEMASendOmniChannelMessagesRequest
JSON SCHEMASendPaymentOutcomeRequest
JSON SCHEMASendReplyMessageRequest
JSON SCHEMASms status callback
JSON SCHEMATransactionStatusEndpointResponse
JSON SCHEMATransactionStatusNotificationResponse
JSON SCHEMAWaitforcallback
JSON SCHEMAWhatsAppNotificationListResponse
JSON SCHEMAWidgetConfigResponse
JSON SCHEMAScroll for all 24
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
Other 3
Properties that don't map to a standard resource type
Source (apis.yml)
Clickatell API — frequently asked questions
Does Clickatell have an API?
Yes. APIs.io lists 8 APIs from Clickatell, including Clickatell Chat 2 Pay API, Clickatell Chat 2 Pay API Client Callbacks API and Clickatell External Link Callback API, and 5 more.
Is there an OpenAPI specification for the Clickatell API?
Yes. APIs.io indexes 8 OpenAPI specifications for Clickatell, each linked for download from this page.
How do I authenticate with the Clickatell API?
Clickatell uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Clickatell Authentication.
Is the Clickatell API ready for AI agents?
Clickatell has a Kin Score of 33.2 out of 100 (thin) and an Agent Readiness score of 26.7 (agent-aware), scored by API Evangelist on 2026-11-06.
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.