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The Trading Plaza, booths and auctions, explained
Almost every diamond in Pet Simulator 99 changes hands in one place: the Trading Plaza. It is a separate server with its own rules, its own shop system and its own auction board, and the sales that happen there are what RAP averages. Understanding the Plaza is understanding the market.
Getting in
The Plaza is a separate server instance capped at 50 players, reached through a portal in The Castle, and it requires at least one rebirth before it lets you in. Boosts are suspended inside, so nobody grinds faster than anyone else on the market floor. Inside you will find player booths, the Auction Board, the Trading Terminal, a mailbox, the Pet Collection Machine, a Diamond Party feature, leaderboards and reward machines.
The Pro Trading Plaza gate
A second, Pro tier of the Plaza sits behind a hard wealth gate: own 50 or more huge pets, or 5 or more titanic pets, or a single gargantuan pet. Pets stored in boxes do not count. This is the high value market floor, where the pets that headline the values list actually change hands, and the gate is why huge and titanic supply matters so much: those pets are both the goods and the price of admission.
Booths: the shop system
A booth is a personal shop stall. You list items at a diamond asking price and buyers purchase directly, no haggling required. Booth skins are cosmetic, and they are tradable items with their own RAP. Two anti-scam rules from January 2024 shape how booths feel: players render transparent near booths so an avatar cannot block your view of a stall, and a newly listed item carries a 3 second purchase cooldown, which blunts both bot sniping and fat finger listings. A booth price is an asking price, never a value: check it against RAP in the checker before you buy.
The Auction Board
The game's auction house is the Auction Board inside the Plaza (there is no separate auction system). Auctions run 60 seconds, for pets including huge and titanic pets, exclusive eggs and items, with bids in diamonds. The anti-sniping rule is the part bidders miss: a bid placed inside the final 15 seconds resets the timer to 15 seconds, so an auction never truly ends while people are still bidding. Sniping at the last second does not steal anything; it just extends the fight. Value your maximum bid against RAP before the auction starts, not against the current bid in the heat of it.
The Trading Terminal: where prices are really set
The Terminal is a machine in the Plaza that searches booth listings globally, across Plaza servers: pets, cards, items, potions, enchants, ultimates, hoverboards, eggs, charms and booths, with filters including the shiny and golden variants. Find a listing and it teleports you to the seller's server to buy. Because it makes every booth on every server visible from one screen, the Terminal is the practical price discovery surface of the whole economy, and its completed sales are the raw material RAP is averaged from.
Direct trading
Player to player trading opens from the inventory menu and covers pets, items, enchants, potions, hoverboards, booths and diamonds themselves; either side can add any amount of diamonds and pets. Trade access is a setting (enabled, disabled, or friends only), and some items are flagged untradable and cannot move at all: anyone offering you an untradable item through some side channel is describing a trade the game will not let happen.
Values and exists counts: the official BIG Games public API (ps99.biggamesapi.io), pulled November 1, 2026, 16:42 UTC. RAP is a recorded average of real Trading Plaza and auction sales, not a guaranteed trade price. Pet and egg facts: Pet Simulator Wiki contributors (CC BY-SA), checked November 1, 2026. eggvalues.com is a fan site and is not affiliated with BIG Games or Roblox Corporation.