Developer Documentation

sendmsg.io API Reference

RESTful API for transactional and marketing email, SMS, and WhatsApp messaging. Bearer token authentication, JSON responses, and real-time delivery tracking.

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Base URL

apis.sendmsg.io

Auth

Bearer API_KEY

Format

JSON / REST

API Endpoints

Email Sending

Send transactional and marketing emails via REST API or SMTP relay with built-in reputation protection.

POST/v1/integrations/{id}/send

GET/v1/integrations/{id}/status

Contacts

Create, update, and manage contacts with custom properties, groups, and segmentation.

GET/api/v2/contacts

POST/api/v2/contacts

PUT/api/v2/contacts/{id}

DELETE/api/v2/contacts/{id}

Templates

Manage email templates with dynamic variables, Unlayer editor support, and version control.

GET/api/v2/templates

POST/api/v2/templates

PUT/api/v2/templates/{id}

Domains

GET/api/v2/domains

POST/api/v2/domains

GET/api/v2/domains/{id}/verify

Sender IDs

Manage verified sender email addresses linked to authenticated domains.

GET/api/v2/sender-ids

POST/api/v2/sender-ids

Reports & Analytics

Access delivery stats, open/click tracking, bounce reports, and reputation metrics.

GET/api/v2/reports/delivery

GET/api/v2/reports/domains

GET/api/v2/reports/activities

Groups

Organize contacts into groups for targeted campaigns and segmented sending.

GET/api/v2/groups

POST/api/v2/groups

PUT/api/v2/groups/{id}

Webhooks

Receive real-time delivery events — bounces, opens, clicks, complaints — via HTTP callbacks.

POST/v1/integrations/{id}/send (webhook payload)

Ready to integrate?

Get your API key from the sendmsg.io console and start sending in minutes. Full reference documentation with code examples in cURL, Python, and Node.js.

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