curl --request GET \
  --url https://test.deribit.com/api/v2/private/delete_address_beneficiary \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "private/delete_address_beneficiary",
  "params": {
    "currency": "BTC",
    "address": "bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf0uyj"
  }
}
'

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": "ok"
}