I just released 'Objects' in arcsecond.io. Code was already there, but the setup with Heroku and DNS and all tiny picky details were finally easier than I thought yesterday! Give it a try, with the following example:

http://api.arcsecond.io/1/objects/GRO J1655-40

This is still alpha version. APIs will change a bit in the future, but at least, you can already play with it!