curl --request POST \
  --url https://api.tokenlayer.network/functions/v1/check-token-ownership \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "token_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "user_address": "<string>",
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "success": true,
  "is_holder": true,
  "balance": 123,
  "cached": true
}