Sequence is an infrastructure platform for integrating blockchain functionality into games and applications, developed by Horizon Blockchain Games. One of the project's key products is its embedded wallets — non-custodial wallets created directly within an application that allow users to sign in via email, social accounts, or other familiar authentication methods. This approach hides much of the technical complexity of Web3: players do not necessarily need to install a separate wallet extension, store a seed phrase, or manually confirm every standard action. By 2026, Sequence has developed a broader stack that includes wallets, SDKs for Unity and Unreal, an Indexer, Transaction API, payment tools, and infrastructure for in-game assets.
Contents
- What Is Sequence and How Has Its Web3 Infrastructure Evolved?
- Embedded Wallets and Seedless Player Authentication
- SDKs, Indexer, and Sequence Infrastructure for Web3 Games
- Gas, Transactions, and In-Game Digital Assets
- Ecosystem Wallet and the Future of Sequence in Blockchain Gaming
1. What Is Sequence and How Has Its Web3 Infrastructure Evolved?
Sequence was created by Horizon Blockchain Games, a Canadian company that also developed the Web3 trading card game Skyweaver. Horizon has been working in blockchain gaming since the late 2010s, while Sequence emerged as a separate infrastructure product for developers. Its purpose is to move common operations involving wallets, transactions, and on-chain data into a ready-to-use technology layer.
In October 2022, Horizon raised $40 million in a Series A funding round led by Brevan Howard Digital and Morgan Creek Digital. Ubisoft, Take-Two Interactive, Polygon, Xsolla, BITKRAFT, and other investors also participated in the round. The company stated that part of the capital would be used to develop Sequence and expand its developer ecosystem.
Sequence was initially closely associated with NFTs and Web3 games, where developers needed wallets, marketplaces, and tools for managing gaming assets. Over time, the platform evolved into a modular infrastructure stack for EVM applications. In addition to gaming, its current documentation identifies payments, DeFi, stablecoin applications, and other on-chain services as potential use cases.
Sequence is not a standalone blockchain or gaming L1 network. The platform operates as an infrastructure layer on top of supported EVM networks and provides developers with SDKs and APIs. As a result, a game can use its own smart contracts and selected blockchain network while Sequence handles wallets, authentication, data retrieval, and transaction submission.
2. Embedded Wallets and Seedless Player Authentication
Sequence Embedded Wallet is designed to create a non-custodial EVM wallet directly within a game or application. Users can authenticate via email, a social provider, or guest mode, after which the wallet is created programmatically. The gaming interface does not need to display traditional Web3 connection windows or require users to approve every individual operation.
In Embedded Wallet v5, Sequence uses the secure AWS Nitro Enclaves environment to process sensitive data. According to the documentation, the architecture is designed so that accessing a wallet requires the owner's consent, while Sequence itself cannot access protected data inside the enclave. This distinguishes the embedded model from a conventional custodial gaming account, where private keys are controlled by the service operator.
Key features of Sequence Embedded Wallet include:
- creating an EVM wallet when a user registers;
- authentication via email and social accounts;
- guest login for selected use cases;
- message signing and interaction with smart contracts;
- sending standard and batched blockchain transactions;
- support for ERC-20, ERC-721, and ERC-1155 assets;
- the ability for projects to sponsor gas fees;
- integration with Web, Unity, Unreal Engine, and mobile applications.
For games, the main difference of this approach lies in the user experience. In a traditional Web3 model, a player first installs an external wallet, creates or manages keys, connects the wallet to an application, and obtains the network's native token to pay transaction fees. Embedded Wallet moves many of these operations to the infrastructure layer, making registration more similar to a conventional Web2 account.
However, the absence of a seed phrase in the user interface does not mean that cryptographic keys and related risks disappear. Security depends on authentication implementation, session management, the developer's application, and wallet infrastructure. An embedded wallet should therefore be viewed as a different way of managing access to an on-chain account rather than as a solution that eliminates all risks associated with crypto wallets.
3. SDKs, Indexer, and Sequence Infrastructure for Web3 Games
Sequence provides several SDKs for different development environments. Unity and Unreal Engine, two widely used game engines, are particularly important for gaming studios. The Unity SDK combines wallet and Indexer functionality, while the Unreal SDK provides tools for authentication, transactions, inventory management, and other Web3 mechanics. JavaScript, TypeScript, and React tools are available for browser applications, while React Native SDK supports mobile products.
The Indexer addresses a separate challenge for blockchain games: retrieving up-to-date information about user assets. Instead of continuously scanning a blockchain independently, an application can use the API to request balances, tokens, NFTs, and related on-chain activity. This allows the blockchain to serve as the ownership layer for gaming items without requiring the game client to process the network's entire transaction history directly.
| Component | Function | Use in Games |
|---|---|---|
| Embedded Wallet | Non-custodial wallet inside an application | Registration and management of gaming assets |
| Ecosystem Wallet | Unified smart wallet for an ecosystem | Shared account across multiple applications |
| Unity SDK | Sequence integration with Unity | Web3 functionality in Unity games |
| Unreal SDK | Native integration with Unreal Engine | Wallets, transactions, and inventory |
| Indexer | Retrieval of on-chain data | Balances, NFTs, and gaming items |
| Transaction API | Transaction submission and processing | Gas abstraction, batching, and sponsorship |
The infrastructure also includes tools for marketplace and checkout use cases. Developers can display NFT inventories directly within a game, create an in-game store, or allow users to purchase digital items without requiring them to visit a third-party marketplace. This is particularly relevant to Web3 gaming because an external wallet and separate NFT marketplace increase the number of steps between the gaming interface and the blockchain.
The modular architecture allows studios to use only the components they need. For example, a project can integrate the wallet and Indexer while implementing its own marketplace, or use Sequence for transaction infrastructure on top of an existing account system.
4. Gas, Transactions, and In-Game Digital Assets
One of the challenges of blockchain games is the need to pay gas fees. Even if a user receives an NFT for free, transferring it later or interacting with a smart contract may require the network's native token. Sequence Transaction API supports gas sponsorship, allowing developers to cover transaction fees for users at the project, contract, or specific-address level.
Transaction API operates as a relayer and supports not only fee sponsorship but also fee abstraction, batched transactions, and parallel transactions. In certain scenarios, users can pay transaction fees with a supported token instead of the network's native asset. For games, this makes it possible to combine several on-chain actions into a simpler user flow.
For example, receiving an item, interacting with a smart contract, and performing another related operation can be processed without a series of separate confirmations if the application's architecture supports this model. Developers must still account for the cost of subsidized gas: transactions that are free for players are not free for the game itself, so sponsorship policies require economic limits and protection against abuse.
Sequence supports common Ethereum token standards, including ERC-20, ERC-721, and ERC-1155. ERC-1155 is particularly applicable to gaming items because a single contract can manage multiple types of fungible and non-fungible assets. A player's inventory can be displayed within a familiar gaming interface while ownership of the corresponding token is recorded on-chain.
As a result, Sequence separates the game's user experience from low-level blockchain mechanics. Users can interact with a conventional store, profile, and inventory while the infrastructure handles signing, data requests, transaction submission, and smart contract interactions in the background.
5. Ecosystem Wallet and the Future of Sequence in Blockchain Gaming
By 2026, Sequence's wallet architecture has evolved beyond the original Embedded Wallet. Current documentation identifies Ecosystem Wallet v6 as the primary direction for new ecosystem integrations, while Embedded Wallet v5 continues to be supported for existing applications and prototypes. Developers with active embedded integrations are encouraged to consider a potential transition to the newer architecture.
Ecosystem Wallet is a non-custodial smart wallet that can be used across multiple applications within the same ecosystem. Authentication supports passkeys, social accounts, and email, while Smart Sessions allow predefined, limited permissions to be granted to a specific application. This reduces the need to repeatedly request user signatures while maintaining restrictions on an application's access to the wallet.
For gaming ecosystems, this approach addresses fragmentation. If a publisher operates multiple games, a unified account can use a shared identity and address across applications, while gaming assets can be displayed in a connected portfolio. Sequence is also developing cross-chain functionality, built-in swaps, on-ramp, and checkout tools, gradually turning the wallet from a standalone login module into an interface connecting users with multiple blockchain services.
At the same time, Sequence remains dependent on the development of the Web3 gaming market itself. Embedded wallets reduce technical barriers but do not solve issues related to game quality, demand for tokenized items, or the sustainability of in-game economies. Smart contract risks, compromised user accounts, integration errors, and risks associated with the networks on which applications operate also remain relevant.
In its current form, Sequence is more accurately described as a modular Web3 infrastructure stack rather than simply a crypto wallet for games. Embedded Wallet remains an important part of this model, but it operates alongside Ecosystem Wallet, SDKs, Indexer, Transaction API, marketplace, and payment tools. For the gaming industry, the main purpose of this approach is to integrate ownership of on-chain assets and blockchain transactions directly into the gaming UX without turning wallet interaction into a separate user process.
