# Introduction

What is Hybrid Stack Token?

Hybrid Stack Token (HST) is an innovative token type that integrates Fungible Tokens (FT), Non-Fungible Tokens (NFT), and Semi-Fungible Tokens (SFT) into a single and cohesive framework. This design addresses the fragmentation of traditional token standards by uniting diverse token types within a layered architecture, offering unprecedented flexibility for crypto applications.

<figure><img src="/files/gdQEjUt0ne46QF2pWIj9" alt=""><figcaption></figcaption></figure>

HST framework consists of two distinct layers: **Base Token** and **Stack Tokens**. **Base Token** serves as the foundational layer, with its type (FT, NFT, or SFT) determined by the specific implementation. Each Base Token is equipped with a unique identifier and storage space, enabling it to manage Stack Tokens and store metadata, relationships, or custom attributes. The Base Token defines the technical ecosystem—establishing the rules and infrastructure for token issuance—and provides native liquidity as a foundational value pool.

**Stack Tokens**, which can also be FT, NFT, or SFT, are issued on top of the Base Token. These tokens implement diverse functionalities tailored to specific requirements, such as expiration, metadata updates, or conditional transfers. While the Base Token lays the groundwork, Stack Tokens enhance its value by introducing unique attributes and enabling personalized, diversified market applications, ranging from currency transactions to digital collectibles and real word assets.

### Purpose and Vision

**Purpose**: HST was developed to unify the disparate worlds of FT, NFT, and SFT, overcoming the inefficiencies of traditional token systems that rely on separate standards (e.g., ERC-20, ERC-721, ERC-1155). By leveraging the Base Token’s unique identifier and storage space, HST simplifies token management and fosters innovation. The Base Token’s role in providing native liquidity and defining the technical ecosystem, combined with Stack Tokens’ ability to create diverse markets, enables a wide range of use cases—from gaming and DeFi to real word assets—within a single framework.

**Vision:** HST aims to pioneer a modular, scalable, and interoperable token ecosystem that powers the future of decentralized technologies. By offering a flexible foundation where developers can customize Stack Token functionalities and markets, HST seeks to drive the next generation of cryptocurrencies.

### Current Implementation

To date, [HACD (Hacash Diamond)](/hacd-labs/hacd-hacash-diamond/editor.md) stands as the world’s first implementation of the HST framework, marking a significant milestone in token innovation.&#x20;

<a href="/pages/cEHgDv7NGBquDGHeLyQ4" class="button primary">HACD</a>

{% hint style="info" %}
Creating new HST is not yet supported on Ethereum or Solana; users can issue Stack Tokens within HACD’s framework.
{% endhint %}


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