Here's something I posted back in February on APIs:
"Just thinking about ways to help people start an account and it occurred to me that if they could use other crypto currencies that would make entry much easier. I know there are issues with converting fiat to crypto but, how about crypto to crypto? What if a person could simply select from a drop down menu one or more of some of the top performing coins and instantly convert that amount to DNotes that is automatically deposited in a retirement or, other vault account?
No third parties, no exchanges to deal with manually, the vault site does the calculation and API calls could make the exchange. I'm not an expert in this area but I believe this could be totally automated without re-inventing the wheel. Something to think about. The easier it is to get onboard, the better."
If we could receive almost any coin and convert/deposit it to a customers vault account as DNotes, that would be amazing...
I would go for that. If I were selling something online, I would want to be able to accept as many different ways to pay as possible, including being able to take payment in as many people's favorite cryptocoins.
The mining pool Multipool.us has a similar feature and it integrates with Cryptsy. So let's say you point your mining rig to their multiport, you would be mining a number of different Scrypt coins based on their formulas for determining the most profitable coin to mine. You can then set your account to automatically pay out each coin to your Cryptsy address for that coin. Then when you're logged into Cryptsy, you can set each coin to autosell. Of course the autosell converts your altcoin into Bitcoin based on the parameters you set (you have four to choose from). In the end what you end up with is a fairly seamless conversion from your rig's hashing power to the various altcoins your rig mines to Bitcoin. You then could make a manual trade from Bitcoin to DNotes (Cryptsy doesn't support DNotes yet but I'm sure that will change soon enough). Of course, your source of altcoins could also come from selling merchandise and taking payments in the various cryptocoins.
I mention this as an existing system that approaches the crypto to crypto conversion. Ways that this system could be improved on are that the conversion goes from altcoin directly to DNotes (without having to first convert to Bitcoin), and that it can all happen within the DNotes Vault (no need to send to a secondary website and then back again). I imagine conversion from altcoin to DNotes could be based on an aggregate of the going rate for that altcoin across several exchanges along with a Bitcoin/DNotes price index. I personally wouldn't have a problem if there was a small percentage fee involved especially if the process could be automated and it was all handled within DNotes Vault and it was very secure.
Converting a pre-approved list of alt-coins, including Bitcoin, to DNotes within DNotesVault is not a big technical challenge. The unsettled regulatory requirements may be more challenging than we like to believe. Let's keep our options on the table for now.