RP

The Riot Points (Formerly known as combat points earlier in the European server) is currency that can purchased with real money and is used to purchase things to add convenience, extra customization options, or to add diversity to the experience. Examples of things that can be purchased with Riot Points are Champions, alternate Champion Skin, or boosts, which are modifiers that increase the rate at which you gain Influence Points or Summoner Experience Points. Apart from purchasing champions, which are also obtainable using Influence Points, Riot Points cannot be used to directly affect gameplay.

Buying Riot Points
There are multiple methods to choose from when buying Riot Points and in varying amounts.

10 dollar and 25 dollar cards are available at places like Best Buy, Gamestop,7/11 and EB Games.

$10 = 1380 RP

$25 = 3500 RP The cards dont say how many points are included, so be sure to purchase the right card.

You can also buy them online using your credit/debit card info.

On extremely rare events, such as the server issues of rotation week 40, summoners that played that week were compensated with 350 RP.

Value of Riot Points
Although many people claim that Legendary Skins cost $20, this table shows they actually cost $14 and that is not factoring in any bonus points you can gain by purchasing larger bundles of Riot Points.

Some online payment methods will give you more, or less points for your dollar. Purchasing points with a mobile phone for example, wields less net income of points, as opposed to using pay-pal for the transaction.

Champions' Prices
For a table listing the RP prices of all the champions, please see here.

Trivia

 * Although they can be used to purchase champions, Riot Points cannot be used to purchase runes.
 * Beware when purchasing champions with Riot Points, as some are more cost efficient that others. For example, costs 3150, and 975, whereas all champions who cost 6300 are 975. Thus, purchasing  would cost the same number of Riot Points as purchasing, though she is worth half the amount of Influence Points.