Poker Odds API is an example API built using ASP.NET OWIN. Given a Texas Holdem Poker hand (and optionally the community cards) it will calculate the odds of winning.

Poker Odds uses the excellent PokerHandEval code written by Keith Rule (based in turn on the poker-eval library). Users of the API submit information on their hand, and get back information on the possible outcomes of the game.

Cards are submitted as a sequence of two character codes separated by spaces. For example, to specify that your pocket cards are the two of diamonds and the queen of clubs, you would pass "2d qc" as the pocket parameter. If you wanted to pass 7 Hearts, Ace of Spades and 10 Hearts as the board, you would specify this as "7h as th". Note that the character "t" indicates 10.

A live demo of the API is hosted at http://pokerodds.azurewebsites.net/

Requesting the following URL:

http://pokerodds.azurewebsites.net/?pocket=2d%20qc&board=7h%20as%20th

Results in the response:

{
	"Pocket" : "2d qc",
	"Board" : "7h as th",
	"Outcomes" : [{
			"HandType" : "HighCard",
			"WinChance" : 0.070544587970861425
		}, {
			"HandType" : "Pair",
			"WinChance" : 0.18659517426273459
		}, {
			"HandType" : "TwoPair",
			"WinChance" : 0.0509451079156173
		}, {
			"HandType" : "Trips",
			"WinChance" : 0.0087375091396539109
		}, {
			"HandType" : "Straight",
			"WinChance" : 0.013022991307173612
		}, {
			"HandType" : "Flush",
			"WinChance" : 0.0
		}, {
			"HandType" : "FullHouse",
			"WinChance" : 0.0
		}, {
			"HandType" : "FourOfAKind",
			"WinChance" : 0.0
		}, {
			"HandType" : "StraightFlush",
			"WinChance" : 0.0
		}
	],
	"OverallWinSplitChance" : 0.0,
	"Completed" : false
}

• ASP.NET OWIN