DEVELOPERS

Messaging APIs built for Developers

Use our multichannel APIs to send and receive messages across SMS, WhatsApp, Email and Voice.

Our APIs provide you with a single interface for all your messaging needs, allowing you to easily connect your software with your users.

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Seamless integration

Our APIs act as a single point of integration for various communication channels, eliminating the complexity of dealing with multiple vendors and networks. Focus on your messages for your end-users.

We’ve got your back

Comprehensive developer resources ensure you’re never left in the dark. We offer detailed API documentation, code examples in multiple languages, guides and dedicated local support teams ready to assist you.

Reliable and secure

With an uptime of 99.99% and ISO, Cyber Essentials, SOC2 accreditations rest assured that you are in safe hands.

Built by developers, for developers. Integrate our APIs for simple, real-time communication



Use our API documentation to integrate Esendex’ services into your systems within minutes. Here’s how to send an SMS:

// The POST v1/messages endpoint allows you to send a message to a single contact in one request.
// The message can also be sent via different channels; including SMS, Whatsapp and RCS.

curl -X POST 'https://api.esendex.co.uk/v2/messages' -H 'X-Api-Key: {{your-key-here}}' -H 'Content-Type: application/json' -d

{
  "accountReference": "EXxxxxxxxx",
  "name": "name",
  "characterSet": "characterSet",
  "channel": "channel",
  "from": "from",
  "validity": "2025-07-30T09:38:04.4517739+00:00",
  "messageType": "messageType",
  "body": {
    "text": "text",
    "templateId": "templateId"
  },
  "recipients": [
    {
      "msisdn": "msisdn",
      "variables": {},
      "metaData": {}
    }
  ],
  "addressBook": {
    "contacts": [
      {
        "id": "id"
      }
    ]
  },
  "metaData": {}
}

No commitment, 30 day free trial

Begin your journey by opening a free Esendex account today and get 100 SMS credits.

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Ready? Set? Go!

Learn how to get your service up and running with our simple quickstart guides.

Read our API docs

“Without Esendex’s SMS API we wouldn’t have been able to provide such a robust click-and-collect solution”

Commercial Manager – Capgemini

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