is $10 Pro monthly subscription a pre-requisite before i can purchase $10 in API credits? PS: i would have loved if I can directly buy $10 in credits and be fr

is $10 Pro monthly subscription a pre-requisite before i can purchase $10 in API credits? PS: i would have loved if I can directly buy $10 in credits and be free to spend it as quickly or as leisurly as I want -- without any monthly expiry or fixed recurring payments