Like all currencies a universal credit coin consists of smaller units. To make it easy we refer to standardized units of measurement. The smallest unit is called a nUCC (spelled: nano UCC).
1 UCC consists of 1 000 000 000 nUCC
This means the smallest amount you would be able to send is exactly 0,000000001 UCC or in other words 1 nUCC.
NOTE: Before we had scaled 1 UCC to be 1 000 000 μUCC (micro), but we have refined it during development. This is because the internal calculation of the the coinload was based on this scale when we introduced decreasing payouts. The bigger the scale was, the smaller was the blur in view of a long period of time. This is the main reason we changed the scale.