Higher Conversion rate at Vested

Hi,
I use Axis Bank to add money in Vested wallet. I would like to understand why conversion rate is higher at Vested? I have account at your competitor INDmoney also. At INDmoney same Axis Bank has lower conversion rate than Vested.
That means more Dollar for the same INR. Why is it higher at Vested?

P.S I have not tried adding money using other banks.