As per the available info, Zerodha is charging 0.04% daily, which works out to around 15.7% annually. Is there any particular reason why Zerodha has opted to go for this rate as compared to lets say, 11.5% that it offers for LAS ?
I feel the rates are slightly on the higher side 
While interest rate is a key factor, We should also consider a comprehensive overview like Brokerage, Pledge charges, and DP charges as the interest rate offered by the top brokers is more or less in the same range.
| Broker | Interest | Brokerage | Pledge | DP | Number of days allowed |
|---|---|---|---|---|---|
| Groww | 15.75% below 25 lakhs,9.75% above 25 lakhs | 0.1% on order value (no upper cap) | 20 for pledge, 20 to unpledge | 18.25 + GST (which is 21.535 per ISIN per day) | Perpetual |
| Zerodha | 15.70% | 0.03% or ₹20, whichever is lower. | ₹30+ GST to pledge, and no charges for unpledging. | ₹13 + 18% GST = ₹15.34 | Perpetual |
| Angel | 18% now, 14.99% from Nov 1st | 20 or 0.1% which ever is lower, (from november 1st) | 20+ GST to pledge, 20+ GST to unpledge | 23.6 Non-BSDA, 59 BSDA (Including GST) | 90 max |