Arena Points

Arena Points (AP) is a feature added in Grand Theft Auto Online as part of the Arena War update.

Overview
The Arena Points work as a separate experience point system similar to the Reputation, with the sole difference in that AP is earned through the Arena War modes, only when the player owns an Arena Workshop (otherwise, they only earn RP points). As expected, the player earns more AP if they win a match.

Sponsorship Tier
Each experience bar represents a level defined as Sponsorship Tier, which gives the player a reward, ranging from RP bonuses and Arena clothes to discounts on vehicle modifications and trade prices. Note that rewards are picked randomly.

Specific tiers also gives special vehicles that can be requested on Pegasus, which are either rare vehicles found in Grand Theft Auto V or standard vehicles that have no option for purchase or even able to store on garages.

Rewards

 * RP bonus: The player receives a fair amount of Reputation Points (RP).
 * Clothing: Arena-related clothing items are unlocked by sets on the clothing stores or, in the case of masks, on the Vespucci Movie Masks.
 * Modifications: Arena vehicles can have a 50% discount on various set of modifications that apply to all of the three variants (boost, jump, lights, etc.), while specific items are determined by the vehicle listed in the reward (i.e. earning the "Spearheads set" for the Cerberus may unlock the decorations set for the three variants).
 * Players can alternatively purchase a modification without having to earn the reward, but their cost are twice the amount of their "base" price.
 * Trade prices: Vehicles on sale at the Arena War website may get a trade price, which is a 25% discount from their base prices.

Skill Level
The Skill Level is a separate level that determines the player's performance on the Arena War modes. It appears at the end of the match.

The Skill Level has a unique scoring system, where in order to increase a level, they must win matches in the equal amount of the level. This mean the player has to win one match in level 1, two matches in level 2, three matches in level 3, and so on. Losing or leaving the match decreases their Level points by one. Level 20 is the maximum skill level and cannot progress further.

The Skill Level can be increased in either Public or Private matches, the latter being a perfect opportunity if the player decides to play private matches with a friend, since one can easily let the other win every time, reaching the maximum level quickly without risking the progress.