Coin Flip

Probability

Coin Flip uses the boolean isHeads to decide the outcome of a coin flip with true or false.

if (coinFlip[i] == 1 && game.isHeads == true) {

if (coinFlip[i] == 0 && game.isHeads == false) {

Player outcome	Probability
Heads	50%
Tails	50%

House Edge and Multiplier

A 2% fee is taken off the payout by multiplying with 1.98 when a player wins. No fee is taken on a loss. The 2% fee can be found in the Coin Flip contract:

payout += (game.wager * 19800) / 10000;
payouts[i] = (game.wager * 19800) / 10000;

This gives the following multiplier:

Player outcome	Fee	Multiplier
Win	2%	1.98x
Loss	0%	0x

With this information, the house edge for Coin Flip can be calculated at 1% ((2+0)/2).

Odds

With the above in mind the odds and house edge for Coin Flip are:

Odds	Outcome
Decimal odds	0.99
Return to Player	99%
Probability odds	49.5%