In ARC Raiders, the easiest way to make coins is honestly not about grabbing everything you see, but learning what's actually worth turning in. A lot of players figure this out after a few raids: your stash fills up fast, and half the stuff you're carrying is just taking space instead of helping your next run ARC Raiders Coins.
The most reliable items to sell are the pure valuables and trinkets. Things like Lance's Mixtape, Breathtaking Snow Globe, Music Box, Playing Cards, Red Coral Jewelry, Fine Wristwatch, Statuette, and Pottery are basically made for this. They don't really have a gameplay purpose beyond being worth coins, so when you extract with them, it's usually an easy decision to cash them in. Higher-end ones like the Mixtape and Snow Globe can feel especially good to find because they give a big payout for very little effort.
You also end up selling a lot of duplicate gear over time. In ARC Raiders, inventory space is always tight, and holding onto weapons or equipment you never actually use doesn't help much. If something isn't part of your current loadout and you don't have a clear plan for it, it's usually better to turn it into coins and free up space for something more useful on your next raid.
Low-value junk items fall into the same category once you understand crafting better. Stuff like Air Fresheners, Coffee Pots, Coolant, Blown Fuses, and other small industrial or household items tend to drop everywhere. Early on you might keep them "just in case," but after a while you realize they're easy to replace and don't really change your progression, so selling them becomes the default move ARC Raiders Coins for sale.
That said, it's not always a straight "sell everything" situation. Some rarer materials or modules can look like easy money but might actually be important for upgrades later, so it's worth being a bit careful with things that clearly tie into crafting higher-tier gear. If you're not sure what something is for, it's usually safer to hold it until you understand your next upgrade path.
A simple way to think about it is this: keep what helps your next few raids, sell what doesn't. Once you start doing that consistently, your coin income naturally improves, your stash stops feeling messy, and every extraction feels like it actually moved you forward instead of just adding clutter.