Answer:
In buckles or lace I help set the pace. The farther you go the thinner I grow.
What goes up and down, but does not move?
Digital white-out.
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
I have two bodies joined together as one. When standing still, I run and run. What am I?
Brings the sky a lot closer.