About the USD to INR rate
India receives more remittance income than almost any other country, and a large share of it arrives in US dollars from the United States — which makes USD/INR one of the most practically important rates for millions of families, not just traders.
The Reserve Bank of India periodically intervenes to manage excessive volatility in the rupee, so this pair tends to move more gradually day-to-day than currencies with fully free-floating policies, even though it still responds to US rate decisions and India's trade deficit data.
If you're sending money to India, comparing this mid-market rate against what a transfer app quotes you is worth doing every time — the remittance corridor is competitive enough that fees and margins vary noticeably between providers.