granter is the address of the user granting an allowance of their funds.
grantee is the address of the user being granted an allowance of another user's funds.
curl -L \ --url 'https://stride.nownodes.io/cosmos/feegrant/v1beta1/allowance/{granter}/{grantee}'
{ "allowance": { "granter": "text", "grantee": "text", "allowance": { "@type": "text", "ANY_ADDITIONAL_PROPERTY": "anything" } } }