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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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Learn how to get your service up and running with our simple quickstart guides.
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Insights
Idempotency keys and why your retry logic needs them
APIA timeout doesn’t mean the request failed. Without idempotency, your retry might send the same message twice.Webhooks vs polling: choosing a delivery receipt strategy
DevelopersPolling is easier to build and harder to live with. Here’s how to decide which approach fits your volume and latency requirements.Sending your first SMS with the Esendex API
DevelopersA five-minute walkthrough from API key to delivered message, with curl examples you can paste straight into a terminal.
