Esendex

Esendex provides global business SMS and multichannel messaging services, offering APIs for SMS, WhatsApp, RCS, Email, Voice and more. It serves enterprises across multiple countries, enabling messaging, notifications, two‑factor authentication, digital letters and chatbot integration through a unified platform.

Esendex publishes 3 API contracts indexed on the APIs.io network: Credential Management API, Message Dispatcher API, and Message Headers API. Tagged areas include SMS, Messaging, Communications, and Business.

The Esendex catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Esendex’s developer surface includes authentication, documentation, API reference, getting-started guide, pricing, support, engineering blog, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.1/100 thin ▼ -6.6 Agent 19/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 Agent Skills

SMS Messaging Communications Business

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 32.1/100 · thin

Contract Quality 11.2 / 19

Developer Ergonomics 6.5 / 15

Access Clarity 0.8 / 15

Operational Transparency 0.8 / 10

Contract Governance 2.0 / 9

Discoverability 4.0 / 8

Regulatory Posture 2.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · 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 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 0 / 3

MCP Tool Quality 6 / 6

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.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

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)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 5.3 — up to +18.9 composite points
Operational Transparency scores 7.9 — up to +12.0 composite points
Developer Ergonomics scores 43.5 — up to +11.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/esendex/apis.yml: open an issue on github.com/api-evangelist/esendex to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 3

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

Esendex Credential Management API

The Credential Management API from Esendex — 6 operation(s) for credential management.

Esendex Message Dispatcher API

The Message Dispatcher API from Esendex — 2 operation(s) for message dispatcher.

Esendex Message Headers API

The Message Headers API from Esendex — 3 operation(s) for message headers.

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

esendex-send-message

AGENT SKILL

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Esendex Context

14 classes · 27 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Esendex API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

ApiResponseOfCreateCredentialResponse

2 properties

JSON SCHEMA

ApiResponseOfGetCredentialsResponse

2 properties

JSON SCHEMA

ApiResponseOfGetSessionsResponse

2 properties

JSON SCHEMA

ApiResponseOfUserCredential

2 properties

JSON SCHEMA

CreateCredentialRequest

8 properties

JSON SCHEMA

messages

9 properties

JSON SCHEMA

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Esendex Authentication

http · 1 scheme

SECURITY

Esendex Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Esendex Agentic Access

16 operations · 10 acting · 2 human-in-the-loop

16 operations · 10 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: esendex
name: Esendex
description: Esendex provides global business SMS and multichannel messaging services, offering APIs for SMS, WhatsApp, RCS,
  Email, Voice and more. It serves enterprises across multiple countries, enabling messaging, notifications, two‑factor authentication,
  digital letters and chatbot integration through a unified platform.
url: https://raw.githubusercontent.com/api-evangelist/esendex/refs/heads/main/apis.yml
x-type: company
x-source: harvest:tag-qc
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-14 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- SMS
- Messaging
- Communications
- Business
tags_raw:
- SMS
- Messaging
- Communications
- API
- Business
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/esendex-agentic-access.yml
- type: Spectral
  url: rules/esendex-rules.yml
- type: JSONLD
  url: json-ld/esendex-context.jsonld
- type: Vocabulary
  url: vocabulary/esendex-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/esendex-data-model.yml
- type: ErrorCatalog
  url: errors/esendex-problem-types.yml
- type: Conformance
  url: conformance/esendex-conformance.yml
- type: Hosts
  url: hosts/esendex-hosts.yml
- type: Vendors
  url: vendors/esendex-vendors.yml
- type: SDKs
  url: packages/esendex-packages.yml
- type: Packages
  url: packages/esendex-packages.yml
- type: StatusPage
  url: https://status.esendex.com/
- type: Authentication
  url: authentication/esendex-authentication.yml
- type: DomainSecurity
  url: security/esendex-domain-security.yml
- type: Website
  url: https://www.esendex.com
- type: Documentation
  url: https://www.esendex.co.uk/developers/
- type: DeveloperPortal
  url: https://www.esendex.co.uk/developers/
- type: APIReference
  url: https://www.esendex.co.uk/developers/
- type: GettingStarted
  url: https://www.esendex.co.uk/developers/
- type: Pricing
  url: https://www.esendex.co.uk/pricing/
- type: Support
  url: https://www.esendex.co.uk/contact/
- type: Blog
  url: https://www.esendex.co.uk/blog/
apis:
- aid: esendex:esendex-credential-management-api
  name: Esendex Credential Management API
  description: The Credential Management API from Esendex — 6 operation(s) for credential management.
  humanURL: https://developers.esendex.com/api-reference/
  baseURL: https://api.esendex.com
  tags:
  - Credential Management
  properties:
  - type: OpenAPI
    url: openapi/esendex-credential-management-api-openapi.yml
  - type: JSONSchema
    url: json-schema/esendex-messages-schema.json
  - type: JSONSchema
    url: json-schema/esendex-create-credential-request-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-create-credential-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-get-credentials-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-get-sessions-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-user-credential-schema.json
- aid: esendex:esendex-message-dispatcher-api
  name: Esendex Message Dispatcher API
  description: The Message Dispatcher API from Esendex — 2 operation(s) for message dispatcher.
  humanURL: https://developers.esendex.com/api-reference/
  baseURL: https://api.esendex.com
  tags:
  - Message Dispatcher
  properties:
  - type: OpenAPI
    url: openapi/esendex-message-dispatcher-api-openapi.yml
  - type: JSONSchema
    url: json-schema/esendex-messages-schema.json
  - type: JSONSchema
    url: json-schema/esendex-create-credential-request-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-create-credential-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-get-credentials-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-get-sessions-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-user-credential-schema.json
- aid: esendex:esendex-message-headers-api
  name: Esendex Message Headers API
  description: The Message Headers API from Esendex — 3 operation(s) for message headers.
  humanURL: https://developers.esendex.com/api-reference/
  baseURL: https://api.esendex.com
  tags:
  - Message Headers
  properties:
  - type: OpenAPI
    url: openapi/esendex-message-headers-api-openapi.yml
  - type: JSONSchema
    url: json-schema/esendex-messages-schema.json
  - type: JSONSchema
    url: json-schema/esendex-create-credential-request-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-create-credential-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-get-credentials-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-get-sessions-response-schema.json
  - type: JSONSchema
    url: json-schema/esendex-api-response-of-user-credential-schema.json
x-enrichment:
  date: '2026-10-14'
  status: enriched
  artifacts_added: 18
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Esendex API — frequently asked questions

Does Esendex have an API?

Yes. APIs.io lists 3 APIs from Esendex, including Esendex Credential Management API, Esendex Message Dispatcher API and Esendex Message Headers API.

Is there an OpenAPI specification for the Esendex API?

Yes. APIs.io indexes 3 OpenAPI specifications for Esendex, each linked for download from this page.

How do I authenticate with the Esendex API?

Esendex uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Esendex Authentication.

Is the Esendex API ready for AI agents?

Esendex has a Kin Score of 32.1 out of 100 (thin) and an Agent Readiness score of 18.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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