Item Pools — Kamigotchi Wiki

The Fountain at the Crossroads

Item pools live at the fountain in Room 31 (Scrapyard Exit) — the fork in the road leading out of the junkyard. Click the fountain to open the pool screen, or reach the same screen from the Menu wherever you are.

A pool is a standing trade between two items. It holds a reserve of each, and it will always take one and hand back the other. There is no counterparty to wait for and no order to fill: you throw something in, the waters flow something else back.

Tip

Mina's fountain quests walk you through it. A Short Pilgrimage asks you to travel to the Scrapyard Exit, and The Fountain of All That Flows explains the pools and hands you 10 Stone plus 10 Wooden Stick to experiment with.

How the Rate Is Set

A pool has no price list. The rate comes entirely from the ratio of the two reserves. If a pool holds 100,000 Musu and 2,000 Stone, then Stone is trading around 50 Musu each, because that is what the two piles imply.

Think of it as a seesaw. Every unit you take out of one side makes that side scarcer and the other side more plentiful, so the rate shifts against you as you trade. Small swaps land close to the implied rate; large swaps walk the rate a long way. This is price impact, and it is the single most important thing to understand about pools.

Swap into a pool of 100,000 Musu / 2,000 Stone	Stone received	Effective rate
1,000 Musu	19 Stone	~53 Musu per Stone
10,000 Musu	180 Stone	~56 Musu per Stone
50,000 Musu	662 Stone	~76 Musu per Stone

Ten times the input does not buy ten times the output. Splitting a large trade across several visits does not help either, because each swap leaves the reserves shifted for the next one — the curve is the curve. What actually helps is trading against a deep pool: the bigger the reserves, the less your trade moves them.

Info

A pool can never be emptied. The output of a swap approaches the reserve it draws from without ever reaching it, so no trade, however large, can take the last unit out of a pool.

The Swap Fee

Every pool charges a swap fee, skimmed off what you put in before the rate is worked out. Fees run up to a maximum of 10%, and each pool carries its own — check the fountain for the pool you are about to trade against.

The fee does not leave the pool. It stays in the reserves, which means it belongs to whoever is supplying that pool. Fees are the entire reason to be a provider rather than a trader.

Minimum Received (Slippage Protection)

Because the rate depends on the reserves, someone else's swap landing just before yours changes what you get. Every swap therefore takes a minimum received figure: the least amount of the other item you are willing to accept.

Warning

If the rate has moved past your minimum by the time your swap lands, the swap fails rather than filling at a worse rate. That is the protection working. Set the minimum too tight on a busy pool and your swaps will keep bouncing; set it too loose and you can be filled at a rate you would not have accepted.

What Can Be Pooled

Any stackable item can sit in a pool, including Musu itself. Onyx can be pooled once you have brought it in through the Token Portal — inside the game it is an ordinary item like any other, so it can be swapped and supplied like one.

Pools never create items. Every unit in a reserve was supplied by a player, so Onyx sitting in a pool is backed one-for-one by real tokens held in the portal. Items flagged non-tradable cannot be pooled at all, for the same reason they cannot be traded or sent.

Info

Which pools exist is live world state, not a fixed list. Pools are opened by the game, and the pairs available change over time. Check the fountain for what is currently swappable rather than relying on any list written down elsewhere.

Becoming a Provider

You can supply a pool instead of just trading against it. You deposit bothitems at the pool's current ratio and receive a share of the pool proportional to what you put in. Burn that share whenever you like and you get your slice of both reserves back.

The point is the fee. Swap fees pile up inside the reserves, so the pool your share is a slice of keeps getting slightly larger. The longer and busier the pool, the more your share is worth when you withdraw.

Action	What happens
Deposit	You supply both items at the current ratio and receive a share of the pool. Offer an unbalanced pair and the pool takes only the balanced part of it.
Hold	Swap fees accumulate in the reserves. Your share does not change size, but what it is worth grows.
Withdraw	Burn some or all of your share and receive that fraction of both reserves, fees included.

Warning

Providing liquidity is not free money. You end up holding whichever of the two items the traders were dumping, in the proportion the pool arrived at — if the ratio between the two items moves a long way, you can withdraw less total value than if you had simply held your items and collected no fees at all. Supply pools whose two items you are happy to hold either way.

Tip

Withdrawing always works. A pool can be paused by the game, which stops swaps and further deposits — but providers can still pull their share out of a paused pool, so a pause can never trap what you supplied.

Pool Output Is Not “Collected”

Items that come out of a pool are moved to you, not earned by you. They do not count toward lifetime collection totals, so a swap will not advance a quest objective that asks you to collect a number of some item, and Musu swapped out of a pool does not register as Musu earned. If a quest wants you to gather something, gather it — trading for it at the fountain does not tick the box.