Hi Vitaly.
No, there is no documentation of using Alpaca API with MATLAB like it is available for Python.
There are no support packages available for it on Github as well.
But, it is possible to use MATLAB since Alpaca provides a REST API and any programming language that can make HTTP requests can use it.
The following example is on getting account information using Alpaca API in MATLAB:
url = 'https://api.alpaca.markets/v2/account';
options = weboptions('HeaderFields',{'APCA-API-KEY-ID','YOUR_API_KEY_ID_HERE';...
'APCA-API-SECRET-KEY','YOUR_API_SECRET_KEY_HERE'});
response = webread(url, options);
Replace "YOUR_API_KEY_ID_HERE" and "YOUR_API_SECRET_KEY_HERE" with your Alpaca API key ID and secret key, respectively. You can find your API keys on your Alpaca account dashboard.
"webread" is used for HTTP GET requests and "webwrite" can be used to make HTTP POST requests (for placing orders as an example). The response is returned as a JSON object.
Similary, you can use Alpaca's documentation to see the list of requests you can make and then use MATLAB to code them.