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Heymarket is a business messaging platform that lets teams send and manage SMS, MMS, and email conversations at scale. The Heymarket API is a REST API that gives you programmatic access to the same capabilities available in the Heymarket app, so you can integrate messaging directly into your own products and workflows.

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What you can do

With the Heymarket API you can:
  • Send messages — send SMS, MMS, and email messages to individual contacts or entire lists
  • Manage contacts — create, update, search, and delete contacts with custom fields
  • Track conversations — open, close, reassign, and transfer customer conversations
  • Organize lists — build and manage contact lists for broadcast messaging
  • Use templates — create and send pre-approved message templates
  • Schedule messages — queue messages to send at a specific time
  • Receive webhooks — subscribe to real-time events for inbound messages and status changes

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Base URL

All API requests are made to the following base URL: 
https://api.heymarket.com

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JSON encoding

All request bodies must be JSON-encoded, and all responses are returned as JSON. Set the Content-Type header to application/json on every request that includes a body. 
Content-Type: application/json

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HTTPS requirement

The Heymarket API only accepts requests over HTTPS. Requests made over plain HTTP are rejected. Make sure your HTTP client follows redirects and enforces TLS.

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Next steps

Authentication

Get your API key and learn how to authenticate every request.

Rate limits

Understand rate limits, request IDs, and how to handle errors.

Send a message

Follow a step-by-step guide to send your first SMS or MMS.

API reference

Browse the full reference for all available endpoints.