The reference rate as on 30th April, 2018 was not published. In fact, the reference rates were not published by RBI for the dates from 28th April to 1st May, probably due to holidays. The reference rate was earlier published on 27th of April and now it's been published for the 2nd of May, as follows.
The Reserve Bank of India’s Reference Rate for the US Dollar is INR 66.6636 on May 02, 2018.
The corresponding rate for the previous day (April 27, 2018) was INR 66.7801.
Based on the reference rate for the US Dollar and the middle rates of the cross-currency quotes, the exchange rate of EUR, GBP and JPY against the Rupee are given below:
Source: Reserve Bank of India