It's hard to anticipate what a domain like this will be used for. But all sorts of apps are being introduced to make things "easy" for people. And .US is memorable because it's the pronoun "us" -- as in "choose us".
The domain is short and familiar. It reads a bit like "Toys R Us" -- "Easy dot Us".
IF someone wants it, you could sensibly ask for mid 4-figures. If you feel prepared to risk never selling, you might ask for $1x,xxx. Statistically, that's far-fetched. But the domain is versatile enough that you might get lucky and have a well-funded company approach you.
You may end up needing to settle for $1,xxx or below $1,000. Really it just depends on the buyer. Gauge their interest level and their funding and then act to close a sale at whatever price seems appropriate.
Most likely $xxx to $1,xxx if it sells. But the range is fairly wide.
Very little value to a domainer for resale, though. Probably just $xx -- maybe $1xx. If the domainer wants to use it for a project, then maybe a few hundred.