Is this a scam?

Hi everyone! I'm very very new to this and I'm honestly uneasy about this one dom who keeps insisting on receiving money on a platform called Mercuryo which I've honestly never heard of. I just reached out on snapchat to hear him out and sent him some things. I didn't think he would like send the money right away and I have to pay $90 to activate the wallet... which is ridiculous. Should I block? What should i do?

https://preview.redd.it/ar5spfiujqde1.jpg?width=600&format=pjpg&auto=webp&s=b60ce239c55651d3883c08aa0ee7a89e2f40afad