Good idea to act like it's not for you, I will try this ^^
Thinks for the link, I looked at usertesting but it seem for bigger company base on the price
I don't know if you meant this literally but I couldn't find any mention of price ( just the "contact for trial" language which usually translates as "a lot").
Did you find any explicit mention of pricing ?
In the section "get pay to test", you can read users are being paid 10$ for each answer of an average of 20 min
You can post an anonymous survey on Reddit or specific Facebook groups, and have people leave their email if they are open to a follow-up interview.
If you already have a prototype, there are paid online services like UserTesting (https://www.usertesting.com/) where you can specify tasks for users to complete and get verbal feedback.