Thanks for your reply.
I think that’s not what I was looking for. Let me explain it for you.
I have a feed with several products that were imported into wordpress. For example T-shirts.
So every post has a metakey “price” and a single value – for example “10”.
post1 – price: 10
post2 – price: 9
post3- price: 12
I want to create a page with ShowPosts that shows every post with a the metakey “price” where the value is less than 15.
Which means I wanted to know if I can add something to the shortcode like this: “between 0 and 15” or “<15”.
I tried several options in the backend as well.