How to verify UPI address is valid or not? Is there any free APIs? I want to check if the entered UPI address is existing or not

Question

Verification of UPI address using API.

I tried razorpay with this API: "https://api.razorpay.com/v1/payments/validate/vpa" but got response as:

{"error":{"code":"BAD_REQUEST_ERROR","description":"The requested URL was not found on the server.","source":"NA","step":"NA","reason":"NA","metadata":{}}}

I've passed client key and secret correctly but still receives this error.