Always nice to find a literary magazine that pays and doesn't charge for submissions:
CRAFT is an online publication celebrating both emerging and established writers. Our focus is on the craft of writing and how those elements make a good story great. We are interested in strong fiction that shines because of its exploration of craft. We feature new and republished fiction; critical pieces on craft; craft exercises; interviews on craft with established writers; book reviews and summaries; and much more.
They pay $100 USD for flash fiction up to 1,000 words, then 10c/word on top of that until 2,000, and finally a flat $200 USD for work up to 7,000. Short fiction, as the title of their magazine suggests, should emphasize the craft of writing.
Notably, they also accept non-fiction articles, but there don't seem any pay rates associated with those. Do update the listing if you spot anything I missed.
They also accept reprint fiction, but don't pay for those.
CRAFT is open all year 'round, and you can find the listing here: https://literarium.net/market/craft/craft