Will The Point allow you to fundraise in whatever currency you want?
I'll set up a website over the weekend. For the time being, we could have a google form where people put their pledge amounts which show up on a spreadsheet that's publicly viewable (but not publicly editable) on the site.
You would need some way to make the contract (pledges) enforceable. This would typically involve some sort of escrow account by a trusted third party, only with credit instead of cash.