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The Ecomail API v2.0 lets you programmatically manage your email marketing — lists, subscribers, campaigns, automations, and more.

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Base URL

All API requests use the following base URL: 
https://api2.ecomailapp.cz/

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Authentication

Before using the API, you need an API key. To obtain one:
  1. Log in to your Ecomail account
  2. Go to Manage your account → For developers
  3. Click Copy API Key
Every request must include a key header containing your API key: 
curl https://api2.ecomailapp.cz/lists \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json"
Keep your API key secret. Do not expose it in client-side code or public repositories.

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Required headers

HeaderValue
keyYour API key
Content-Typeapplication/json

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CORS and security restrictions

For security reasons, the API does not accept direct HTTP requests from JavaScript/AJAX in a browser. Attempting to call the API from a frontend application results in a CORS (Cross-Origin Resource Sharing) error. JavaScript runs client-side, meaning API requests made directly from a browser would expose your API key. Always send API requests from a backend server where your API key is safely stored. Do not expose API requests in client-side code to prevent key leaks. If you need to access the API from a web application, route requests through your backend server to handle authentication securely.

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Rate limiting

The API allows up to 1,000 requests per minute per API key. If you exceed this limit, the API returns a 429 Too Many Requests status code with a Retry-After header indicating how many seconds to wait before retrying.

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Response format

All responses are returned as JSON. Successful responses return the requested data directly. Error responses include an appropriate HTTP status code.