I've been watching domains in this area, so let me give you my thoughts...
I don't think it is bad, but the 3 terms hurt it a bit. If it were just "creditchecking.com" it would be much better. The "Online" prefix works real well only when the following words are premium like "CreditScore" or even "CreditCheck". The "-ing" ending devalues the keyword a lot IMHO.
It is hard for to value exactly, but I think you would get $xx in resale value and $xxx if you could find an enduser. I think the domain, once developed, works well with the keywords, but it might be harder to find a buyer until that point.
Thanks!