Advice of Charge for Online Commissions

(I have no clue what to flair this)

Hello! I'm a composer, and I'd like to start making a bit of money from my work from cheap online commissions. I write a lot of shorter pieces of many genres, often to complement a bigger art piece like a theatre production or a short film. I'm really attracted by the idea of doing commissions online, but I have no clue how to price my work. I'm thinking that for a short piece of 2-3 mins I would charge around $10 USD, but I don't know if that's reasonable or not. Any career composers willing to help me out?