How much is an 1898 mercury dime worth circulated?

There were no 1898 Mercury Dimes released, Mercury dimes refer to dimes struck from 1916-1945 that depict Liberty with wings on her head.

Instead an 1898 dime is known as a "Barber" dime after Charles Barber who designed it.

Look at the back of your coin, if your coin has no mintmark, it is just worth scrap in heavily circulated condition (about $2 or so) If it has an O or S it has modest value of about $5 in worn condition (although the value jumps dramatically in better condition, particularly with the 1898-O)