Ok, full disclosure: I work for Gandi. We realize that motto is something you can't say on the radio, but it's so true, we just have to say it. We are a small, tough, smart company, the kind we want to work for. We do offer a full API for resellers, so you could white-box the solution if you wanted.
Unfortunately, the second I noticed their motto (no bullshit) I realized I cannot use them for our clients. Sigh :(