I've just confirmed that a Moog Mother32 wallwart powers the Axoloti quite well. It connects, it's center-positive, and it's rated for 12V/1200mA. Same one as for the Moog DFAM. The cable is over six feet long.
These are 'MEGA Electronics' FJ-SW1201200N, might be gettable separately or wholesale. Pretty cool regardless, though, since people often put Moog eurostuff in euroracks, which leaves the wallwart unused… and an Axoloti can be a VERY powerful addition to a Eurorack setup. So if you have that, you already have the wallwart for using the Axo separate from a computer and USB power. You just need a lot of euro jacks to wire in, and a microSD card to store your patches.