How to determine secp256r1 or secp256k1 is used on the web sites
If you look at the all information on the site that provides you can find the answer very fast.

X9.62 ECDSA Signature with SHA-256

X9.62 : Public Key Cryptography for the Financial Services Industry: The Elliptic Curve Digital Signature Standard (ECDSA)&quot;
So, it is the NIST curve and NIST uses the $r$ versions like secp256r1.

A must-read question on our site

Should we trust the NIST-recommended ECC parameters?