Arknights: Endfield Guide | How to Increase Base Size

Here’s a guide on how to increase your Base size in Arknights: Endfield.

Game Guide by Ragib Rawnak on Jan 28, 2026

Adding to your base is a big part of getting better in Arknights: Endfield. Valley Stock Bills are a unique form of money that you will need to buy these upgrades. As you play the game, there are several ways to get this money.

Arknights: Endfield, Guide, How to Increase Base Size

Earning Bills at Outposts

If you get to the Valley Pass, you'll see a refugee camp that serves as a post. Here is where you can sell your extra stuff to get Valley Stock Bills. Arknights: Endfield is a great place to start. You can sell Origocrust, Amethyst Bottles, or Amethyst Parts.

You should also send an assistant to the camp, like Antal. Every time you sell something, you have a 20% chance of getting extra bills. Remember that each camp can only hold a certain number of bills, and it takes time to fill them back up.

Arknights: Endfield, Guide, How to Increase Base Size

Buying Base Upgrades

When you have saved up enough currency, go to your main base and look for the AIC NPC standing outside. This is where you buy expansions to make your building area larger.

The first upgrade costs about 20,000 Stock Bills, but later ones can cost as much as 160,000. You can also buy a Depot Bus for 5,000 Stock Bills in Arknights: Endfield.

This is a very useful upgrade because it gives your storage more spots to connect conveyor belts, which helps as you build more machines.

Arknights: Endfield, Guide, How to Increase Base Size

Trading for High Profit

The most effective way to get rich is by using the Stock Redistribution Terminal. Talk to the NPC named Lucky Carrot and finish his quests to unlock the Elastic Goods market. You want to buy items when they have a red arrow pointing down because that means they are cheap.

After you buy them, check your friends' list to see who has the highest selling price for those items. Visit a friend's ship and use their console to sell your goods in Arknights: Endfield.

This method can make you much more money than selling at your own base. You can add strangers to your friends list to give yourself more options for high prices.

Also, check our Arknights: Endfield Review and other guides below: