Could I use an US based asset as collateral? I can pull 10 -15000 off my credit cards for 5% but I'm looking for 10 times that amount.
Sure you can. If you're looking to get 100-150k and have a US based asset worth that much, I'm assuming it's real estate in the US. So get a long term low mortgage on that, and take the cash and put it into buying your overseas place in cash.
It works out the same - instead of owning your US place in cash and overseas place with a mortgage of 100-150k at 4%, you own the US place with a mortgage of 100-150k at 4% and the overseas place in cash.
You're adding some more risk because if your overseas place is forcibly taken from you, you still have the lien here, but if you feel secure about that, go for it.
If you have some other - non-real estate - asset here worth 150k (collectible car or something?), it'll be a lot harder to use as collateral, you'll have to look into the specifics of that and/or provide us more details.
But the short answer is yes.