Currently IDQ can expose DQ rules as API's.  CDQ the functionality is slated to be available later this year.

thanks,

Scott

In IDQ you can also deploy a rule as a webservice, just open Developer, right click the rule and deploy as webservice.

The end-point can be found by opening the Admin Console -> DIS you deployed to -> Applications and expand the application you deployed to and select the webservice.

here is the doc: Create a REST Web Service

thanks,

Scott

The web service is deployed inside an informatica application.  The application has different service types. 

You deploy a mapplet that contains a DQ transform(s).  The mapplet has an input and output.  When you deploy it as a web service the inputs become inputs for the API and the outputs the return.  So you would use any API interface, postman, python, java....., that can call an API, feed it some data and get back the results.

A simple validation rule will return a binary output e.g. true/false, valid/invalid etc.

It is up to you or the designer of the web application which is used to input the data to determine how you handle the output of the rule which is returned.

On your second question, the webservice URL can be called to validate any data, providing you can create a method to pass the data to the webservice. If you are talking million or billions of rows of data however, a webservice is probably not the optimal method reading the data and passing to a rule.

In that scenario you should be using DQ mappings to read the data, pass to the rule and process the output.