Sold for 350 pure.

https://imgur.com/a/A4JBxyP

Compares are very broken for when the trade was done, so I can only show screenshots.

As said in this suggestion; https://backpack.tf/suggestion/626532e8147e247fe147eb17 , the Fire Glazed Minigun was sold for 500 pure, then 350 pure was used to trade for the Spectrum Splattered Detonator. The seller's compare just shows like the Detonator was traded with nothing in return; https://backpack.tf/profiles/76561198033592102#!/compare/1650326400/1650844800 , that's because the 350 pure were traded away quickly after the trade, so the compare didn't catch up, we got confirmation of that; https://imgur.com/a/yAeZ5BL (moved to marketplace tf)