Balance queries the number of NFTs of a given class owned by the owner, same as balanceOf in ERC721
get
/cosmos/nft/v1beta1/balance/{owner}//{class_id}
ownerstringrequired
owner is the owner address of the nft
class_idstringrequired
class_id associated with the nft
curl -L \
--url 'https://kava.nownodes.io/cosmos/nft/v1beta1/balance/{owner}/{class_id}'