What IS ONDC how it gives discounts more than Swiggy and Zomato

When Ankit Prakash, founder of Aritic, an automation platform, ordered a paneer burger-and-Pepsi combo from Indiana Burgers on Paytm, a seller app on the Open. Network for Digital Commerce (ONDC) he found that it was priced about 45 percent cheaper than what Swiggy was charging for the same.
Like Prakash, other users began comparing prices across platforms, creating a lot of buzz on social media, which pushed up ONDC’s daily order volumes by 2.5X, from 10,000 to 25,000 orders in a span of a few days.
This led people to question whether ONDC would kill the duopoly of Swiggy and Zomato, the two companies that control over 90 percent of India’s $5 billion food delivery market.
Backed by the government, the ONDC is an experiment the first of its kind — to make e-commerce interoperable, giving companies more control over business decisions. It was launched in April last year, but had a slow start. In the first six months, it could only manage a couple of hundred transactions a day at best.