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ELK Studios · mobile-first slots API
ELK Studios API: Wild Toro, Nitropolis and X-iter slots on your casino, one connection
ELK Studios designs slots for the phone first and puts unusual tools in the player's hands, from automatic betting strategies to the X-iter mode menu. With SoftAggregator, all of it runs on your site through a single API and your own wallet.
What makes an ELK slot different
An ELK slot hands the player more control than most: they can let a betting strategy adjust the stake, or pay to enter a chosen bonus mode through X-iter. Add careful maths and mobile-first design, and you have a studio with a very recognisable feel.
ELK Studios was incorporated in Stockholm in 2012 and launched its first games in September 2013. Its breakthrough came with Wild Toro in 2017, which won EGR's Game of the Year award. On 1 December 2021, Scientific Games (since renamed Light & Wonder) completed the acquisition of the studio, which still develops under the ELK brand in Sweden.
Player tools you should know about
Two in-game tools shape how ELK sessions look in your reports: Betting Strategies and X-iter. Neither needs anything from you technically, but both influence the size and rhythm of the transactions you will see.
Betting Strategies
Introduced across ELK titles such as Wild Toro, Betting Strategies let the game change the stake automatically according to a preset rule. The Optimiser adapts the bet to the balance, the Leveller raises it after losing spins and resets after a win, and the Booster increases it after each loss up to a chosen maximum. Players who like a system enjoy them; operators just see debits of different sizes from one spin to the next.
X-iter
X-iter, unveiled in 2021, is ELK's menu of paid entries into special game modes. Instead of a single bonus-buy button, the player chooses between several modes at different costs, from boosted spins to direct access to free spins. It gives the ELK catalogue a clear hook for players who like to decide how much risk to take.
ELK Studios highlights
Dates from ELK Studios and its acquirer's announcements
| Title or feature | Year | Why players choose it |
|---|---|---|
| Wild Toro | 2017 | Walking wilds, a matador respin challenge and the bull that turns wild; EGR Game of the Year |
| Betting Strategies | Across the catalogue | Automatic stake management for players who follow a system |
| Nitropolis | November 2020 | The first game built on ELK's Nitro Reels |
| X-iter | 2021 | A menu of paid bonus modes at different entry costs |
Wiring ELK into a seamless wallet
Nothing about ELK requires custom code on SoftAggregator. The game calls our platform, we call your callback URL with a GET request, and your system moves money on its own ledger. Your players' balances never leave your database.
Practically, you will see three kinds of request. A balance call asks what the player holds. A debit takes the stake, or the X-iter entry fee, in integer minor units (a 0.40 stake arrives as 40). A credit pays a win, including wins from free spins that the player never paid for spin by spin, which is why a credit can come with no debit. Group lines by round_id, reject duplicates by call_id, reverse the original call when rb=1 arrives, and ignore the type label for any validation decision.
Verify each request by recomputing md5(timestamp + salt_key) and checking the timestamp is less than 30 seconds old. Reply HTTP 200 with error 0 when it worked, error 1 plus the balance when funds are short, error 2 for anything else such as a failed signature or unknown username. The developer docs show the exact field list, and the way this single contract spans every studio is set out on our game aggregator API page.
Audience and currencies
ELK has always been strong with Nordic and wider European slot players, and its mobile-first style travels well to Latin American and Asian markets where most play happens on a phone. You pick the currency per player when you call createPlayer, and it stays fixed.
Native options relevant to ELK players include SEK, NOK, DKK, EUR, GBP, CHF, PLN, CZK, CAD, BRL, MXN, ARS, INR, IDR, MYR, SGD, KRW and USD. Where your players pay in a different currency, you can operate the account in USD or EUR and convert on your side; contact us to discuss yours. Our catalogue and currency list are updated continuously, and getProviderList and getGameList hold the current truth.
The case for SoftAggregator over a single-studio contract
ELK is one studio. SoftAggregator is ELK plus 40,000+ games from 200+ providers, reachable through one set of credentials, one wallet specification and one back office. You also keep full control of your brand.
ELK through one integration versus direct
| Need | SoftAggregator | Studio-by-studio |
|---|---|---|
| Add ELK and other premium slot studios | Same API call, different gameid | New project each time |
| Track X-iter and strategy-heavy games | Bets, wins, RTP% and GGR per game in real time | Studio reports, one per supplier |
| Fund play | Prepaid credit, live credit bar, low-balance alerts | Separate settlements |
| Run several sites | One account, per-site keys, callback and currency | Repeat the setup per site |
| Test before launch | Demo white-label casino and demo back office | Varies |
Support runs 24/7 on Telegram (@mentionso) and at [email protected], and new studios and releases are announced on @casinogamessoftware. Casino and sport can also share that wallet through our sportsbook API.
ELK Studios questions from operators
How can I integrate ELK Studios slots into my casino?
Through SoftAggregator: sign up, receive your keys, implement one seamless wallet callback, then list ELK titles with getGameList and open them with getGame. Wild Toro, Nitropolis and the rest of the ELK lobby run on the same connection as every other studio in our catalogue.
Does X-iter work when ELK games are launched through your API?
Yes. X-iter is part of the game client, so the player sees the same menu of paid modes. For you it means debits whose size depends on the mode the player picked; the credits that follow are settled like any other win.
ELK betting strategies change the stake by themselves. Is that a problem for my wallet?
No. Each spin is still an individual debit with its own call_id, just with a varying amount. If a strategy tries to stake more than the player holds, answer error 1 with the current balance and the game stops the spin.
Who owns ELK Studios today?
Scientific Games, now Light & Wonder, completed its acquisition of ELK Studios on 1 December 2021. ELK continues to design and release games under its own name from Stockholm.
Can I launch ELK games in portrait mode on phones?
Pass device=mobile to getGame and the mobile client opens. ELK has built its games mobile-first since the studio launched in 2013, so phone players get the intended layout.
Sources and last update
Studio dates and features were checked on ELK Studios' own game pages and in the acquirer's newsroom.
- ELK Studios game pages (Wild Toro, Nitropolis), consulted September 2026
- Light & Wonder (then Scientific Games) newsroom on the acquisition of ELK Studios, December 2021
- SoftAggregator API documentation (docs.html)
Last reviewed: 24 September 2026.
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