Exactly 13 years ago, on September 12, 2013, Counter-Strike received a mechanic that later became an inseparable part of the skin economy. The Arms Deal Contract allowed players to trade ten items of the same rarity for one skin of the next tier, although the first version of the system had far more restrictions than modern contracts.
The first contracts appeared back in 2013
The Arms Deal Contract became a continuation of the development of the skin system that Valve began actively expanding after the Arms Deal Update. The principle was quite simple: a player gave away ten items of the same rarity and received one skin one tier higher in return.
This exact basic mechanic survived CS:GO and has already been preserved in CS2. Over the years, an entire separate part of the in-game economy formed around contracts — from ordinary attempts to get rid of cheap skins to complex calculations of odds, float, and potential profit.
At first, the system was much stricter
The first version of contracts did not allow players to simply take any ten items of the appropriate rarity. For the Arms Deal Contract, skins specifically from the Arms Deal collection had to be used — items from other collections available at the time were not accepted by the system.
This significantly distinguished the original mechanic from the one players got used to later. The system gradually became more flexible, while the contract itself turned from a small addition to the update into one of the key tools for working with skins.
Valve separately clarified the situation with knives
One of the most interesting details of the old patch note was a separate clarification about knives. Valve immediately stated that it was impossible to receive a knife through the Arms Deal Contract, effectively shutting down one of the most obvious ideas players had for using the new mechanic.
This rule was fundamentally important for the item economy. Knives remained a separate category of rare drops, while the contract only allowed movement between standard skin rarity tiers, without creating an alternative way to obtain the most valuable items.
The contract could literally be signed
The old version of the interface was also remembered for another feature — the ability to draw directly on the contract document. Before confirming the trade-up, a player could leave their own signature, drawing, or any other scribble.
Of course, this did not affect the result of the contract in any way, but exactly such small details created the character of the old CS:GO interface. For many players, the trade-up process itself felt much more personalized because of this than simply pressing a button.
A whole system grew out of a simple mechanic
Over 13 years, the meaning of contracts changed significantly. If at first they were primarily a way to turn ten less valuable items into one rarer item, later players began to take collections, the odds of a specific result, float, and potential market value into account.
As a result, the ordinary Arms Deal Contract turned into a mechanic around which calculators, special strategies, and entire areas of skin trading appeared. At the same time, the fundamental principle has barely changed during all this time — ten items are given away for a chance to receive one rarer item.
13 years of one of the oldest skin mechanics
On September 12, 2013, contracts were only one of the new elements of the still-young CS:GO economy at the time. Thirteen years later, the system remains relevant already in CS2 and continues to be used by players every day.
And it all began much more simply: only certain skins, strict restrictions, and a separate warning that a knife definitely would not drop from a contract. And, of course, the legendary field where, before confirmation, players could leave their own “signature.”
