Onlyplay API: mobile-first casino games for your lobby

The case for Onlyplay in numbers the studio has published

Onlyplay's selling point is engagement, and in July 2025, marking five years since its founding, the studio published figures for its five signature games. Average sessions ran from about five minutes on Hot and Spicy Jackpot to more than twelve minutes on Piggy Tap, and the studio reported that Piggy Tap produced eight times more player actions and seventeen times more GGR than traditional slots.

Operators should read any studio figure as a studio figure, but the direction is clear: these are games designed to be played often and for a while on a phone. That is useful content for a lobby that lives on mobile traffic.

From outsourcing team to independent studio

Onlyplay was founded on 12 June 2020 and is headquartered in Vilnius, Lithuania. Its roots go back to 2007, when the team worked as an outsourcing company building gaming solutions for other businesses; the 2020 launch turned that experience into its own brand and portfolio.

That history shows in the product. Onlyplay titles are compact, technically light and built around a single strong mechanic rather than long cinematic intros. The catalogue covers video slots, crash formats and its own tap games, and the studio serves both fiat and crypto-oriented casinos.

What players like about Onlyplay games

• Something to do with your thumb. Tap Game mechanics give the player an action beyond pressing spin, which turns a slot into something closer to a mobile game.
• Jackpots on screen. Several titles show jackpot tiers permanently, which gives every spin a visible target.
• Respins that feel like progress. Coin collection and Hold and Win rounds make a bonus last and build anticipation.
• Local flavour. Caramelo Jackpot shows the studio will localise a game for one market, which players in that market notice immediately.
• Short screens. Two-reel and mini-reel layouts read well on small phones and slow networks.

Wiring Onlyplay into your platform

Onlyplay reaches your players through the standard SoftAggregator flow: list, create, launch, then answer wallet callbacks. Your server only has to keep balances correct; the jackpots, respins and wheels are run by the game. The exact fields are in the SoftAggregator API reference.

1. POST getProviderList and getGameList to the single endpoint with your api_login and api_password. Keep the Onlyplay provider key and each game's id_hash; use game_type for tabs and play_for_fun_supported to decide where to offer a demo.
2. POST createPlayer with the player currency. A Brazilian player created in BRL stays in BRL; for the same person in another currency, use a different username.
3. POST getGame with the id_hash, the language, device=mobile for phones, the player country and your homeurl. Show the URL in an iframe.
4. Answer our GET callbacks. debit takes the stake, credit pays wins, balance reports the figure you hold.

Patterns to expect from Onlyplay titles

Tap and multiplayer games tend to create frequent, small wallet movements, so a fast callback matters. A bonus buy in Piggy Tap arrives as one bigger debit. Jackpot and respin payouts can come as credits with no debit next to them, sometimes with type=bonus_fs; treat the type as information only and pay the credit.

Amounts are integers in minor units. call_id is unique per transaction, so a repeated call_id means a retry: reply with the first answer and do not book it twice. rb=1 marks a rollback. The key parameter must equal md5(timestamp + salt_key), with the timestamp no more than 30 seconds old. Your HTTP answer is always 200, and the error field says what happened: 0 for success, 1 for insufficient funds together with the current balance, 2 for everything you could not process.

Onlyplay markets and the currencies to use

Brazil is the clearest Onlyplay story, and BRL is native with us. The studio's mobile-first design also suits India, Southeast Asia, Latin America and Central and Eastern Europe, where our native list includes INR, BDT, IDR, PHP, THB, VND, MXN, ARS, PLN, CZK, HUF, RON, BGN and EUR.

Other currencies go through the USD or EUR route: your account runs in one of those, and you convert on your side before calling us. Ask us about your currency if it is not in the list above.

SoftAggregator or a separate Onlyplay contract

Onlyplay is strongest as part of a mixed mobile lobby, and that is what one integration with SoftAggregator gives you: Onlyplay next to 200+ other providers, one callback, one report, one balance of prepaid credit. Through our casino game aggregator API you can add Onlyplay the same week as BGaming or Evoplay, then judge each studio on live stakes, payouts, RTP% and GGR in your back office.

You keep your players, your balances and your brand; we never appear on screen. Keys arrive in your operator backend after approval, and 24/7 integration help is available on Telegram at @mentionso. If you want casino and sports on the same wallet, the sportsbook API runs on the same platform. The catalogue and currency list keep changing; the API always returns the current picture.

Operator questions about Onlyplay

Sources and last update

The figures quoted above are the studio's own, as reported in its fifth-anniversary review.

• Yogonet International, "Five years of Onlyplay: 5 iconic games behind the rise", 7 July 2025
• Onlyplay company profile, consulted September 2026
• SoftAggregator API documentation, September 2026

Last reviewed: 24 September 2026.

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