These days, equavalent salaries in india are between 1/4th to 1/2 of equavalent american or uk salary for the same job. Adjusting for cost of living is a bit tricky as there are many things which are cheaper in India, but many things that a sw developer may want to buy are not so. In general electronic items are a bit more expensive in India, but things like rent, cost of food, clothing, cost of a basic car are lesser here in India. OTOH, mostly it is not apples to apples comparison. e.g. you can get cars for 5-8000 usd here in India, but those cars would most likely be illegal to sell in the US. When the manufacturers sell the same exact model here in India, the prices are a lot higher.

So if OP says that they get 1/4th of the salary that people from US get for same role, then I feel that he is most likely underpaid.