Also vouching for interest in this.
--edit--
I'll make a brief pitch, as to why the KIN blockchain SDK is more important to have actions/support over the other two, which are Enjin and Dmarket.
At the bottom is the Too Long; Didnt Read (TL;DR) recap.
Lets first look at
Enjin and
Dmarket. They offer very cool features like Non Fungible Tokens (Unique Items) and appealing game demos, but at the end of the day they are tokens built on the Ethereum blockchain. In order to send ENJin based-tokens or Dmarket based-tokens from the game to the player, or player to player someone has to pay the transaction fee. You can think of transaction fees as a shipping fee. Either the buyer or the seller pays but
SOMEONE is going to be paying for it.
Well, how much are the fees for transfer? Thats easy, consult
https://ethgasstation.info/ and look at the numbers in the middle at the top. As of right now, the standard transaction fee is 3 GWEI (transaction fee) which is roughly $.01 that is being paid every time you wish to award an in game item to a player. This is an expensive hurdle to overcome, and you also have to find a way to prevent spam right? You dont want to award an item to players who complete their 10 min in game because then they can make bots and run you dry of the items (which cost you real $ to make plus the transaction fee of sending it to the players)
Next, if you look in the top right, it has the expected wait time. As of right now its 30 seconds. Again, paying $0.01 to reward a player and then a 30 second delay to receive it is going to be annoying for all involved. Of course, you can make it arrive faster if you pay a higher transaction fee like say $.03 and it would probably arrive in around 5-8 seconds.
TL;DRKIN was originally on Ethereum as well, but recently they have moved to their own blockchain which is a forked version of Stellar.
1) Transaction times are ~5 seconds or less. This is roughly the same time it takes traditional IAP to be approved on IOS/Android.
2) As a developer your in app transaction fees are reduced to $0.00 (free transactions!!!) This includes rewarding players with Kin and players purchasing In App Purchases with Kin are set to $0.00
3) Kin is giving away 50 million Kin to all Unity developers who are approved (limited time).
https://www.kin.org/developers/unityapply/apply/.
3a) Even if they did not provide Kin in a worst-case scenario with todays pricing you could buy 1 million Kin tokens for $50 USD and self-fund your account.
4) On Google's Play store, Kin is an approved currency for In App Purchases.
4a) Apple does not allow Kin as an IAP for now. However, the Kin team is still actively negotiating with them on it and there are rumors we may see approval in 2019.
5) At this time, there are no 3rd party Visual Scripting tools which utilize it. This would give you an edge vs the competitors.
6) While not obvious, Kin the currency was created by Kik, the messenger app. And as of 2017, Kik's valuation was at 1 Billion dollars and raised over $100 million dollars via crowdfunding for the purpose of creation of the Kin tokens.
There is more to learn about Kin, especially its Kin Rewards Engine (KRE) but that is not part of this brief (ha) overview.