Просто указывайте область в тексте запроса:

curl -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Token ***" \
  -H "X-Secret: ***" \
  -d '[ "Самарская Сызрань Авангардная" ]' \
  https://cleaner.dadata.ru/api/v1/clean/address

curl -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Token ***" \
  -H "X-Secret: ***" \
  -d '[ "форд фокус" ]' \
  https://dadata.ru/api/v2/clean/vehicle

[
    {
        "source": "форд фокус",
        "brand": "FORD",
        "model": "FOCUS",
        "qc": 0
    }
]