ICON (ICX)

Overview

ICON is a blockchain project built around a simple idea: different networks should be able to exchange information and assets. Its original blockchain used ICX as its native coin. People used ICX to pay transaction fees, take part in network governance, and interact with applications built on ICON. Developers used the network to create smart contracts, which are programs that carry out actions when set conditions are met. (icon.community)

ICON is now in a major transition. The project’s cross-chain work has moved toward SODAX, a platform built around the Sonic blockchain and a token called SODA. The ICON blockchain remains live for ICX transfers and token migration, but its staking rewards and new coin issuance ended in March 2026. The foundation has set December 31, 2026 as the final date for converting ICX to SODA and for shutting down the ICON network. These dates are central to understanding ICX today: it is both the coin that powered ICON’s development and a token being phased out as that work moves to SODAX. (icon.foundation)

History & Team

From an independent chain to SODAX

The ICON Foundation was established in Switzerland in 2017. Its early vision was to connect separate blockchain communities while allowing each one to keep its own rules. ICON held an ICX token sale that year, and its blockchain launched in January 2018. A major upgrade, ICON 2.0, followed in November 2021. It introduced a blockchain engine written in Go and laid the groundwork for Java smart contracts. (icon.foundation)

Min Kim has been a central figure in the project since its founding and serves as president of the ICON Foundation Council. His earlier roles include chief operating officer at Tapas Media and chief strategy officer at DAYLI Financial Group. ICON’s development also involved engineers, foundation staff, independent application teams, and community validators, historically called Public Representatives, or P-Reps. Early funding came through the token sale; ICON’s original plan assigned half of its initial token allocation to that sale. (icon.foundation)

In 2025, the foundation announced that ICON’s next phase would be SODAX. The change moved the project’s main infrastructure from its own blockchain to Sonic and introduced a one-for-one path from ICX to SODA. It also shifted the project’s focus from running an independent chain toward building tools that help people and applications act across several networks. (forum.icon.community)

Technology & How It Works

Blocks, contracts, and cross-chain messages

ICON was designed as a delegated proof-of-stake blockchain. In that system, ICX holders could stake their coins and delegate support to validators. Validators produced blocks, checked transactions, and voted on network proposals. Holders could take part without operating a server themselves. During the current maintenance period, a smaller group of seven core nodes keeps the chain running for transfers and migration. (icon.community)

Applications on ICON used smart contracts known as SCOREs. A SCORE might record a token transfer, manage an exchange, or check a digital credential. ICON 2.0 added support for writing these contracts in Java, a familiar language for many software developers. Users paid for actions on the chain in ICX. (icon.foundation)

Cross-chain communication was ICON’s other major technical goal. Its Blockchain Transmission Protocol, or BTP, provided a way to pass messages between different blockchains. xCall gave developers a common interface for sending those messages, so an application did not need a different basic message format for every connection. A cross-chain message can ask an application on another network to perform an action; moving an asset may involve additional contracts that manage how it is represented on each chain. This work helped shape the broader messaging and execution tools used by SODAX. (icon.community)

Tokenomics & Utility

What ICX was used for

ICX began with several linked roles. It paid network fees, supported transfers between users, helped choose validators, and could be used in ICON-based financial applications. Staking and delegation also formed part of the chain’s earlier reward system. The original token plan divided ICX among token-sale participants, the foundation, community and strategic partners, the team and early contributors, and a reserve. (icon.community)

ICON’s economic rules changed over time. Its incentive system issued ICX for network activity, while a later arrangement with the Balanced application used part of that application’s fees to buy and burn ICX. A burn permanently removes coins from circulation. New ICX issuance and ICON staking rewards ended in March 2026, so descriptions of the older reward system no longer describe how the maintenance-mode chain operates. (icon.foundation)

ICX’s remaining role is closely tied to migration. The approved conversion provides one SODA for one ICX. SODA is a token on Sonic, where the SODAX platform now carries forward much of the project’s work. Two-way conversion ended on September 25, 2026; conversion from ICX to SODA remains open through December 31, 2026. SODA has its own supply rules and uses, rather than continuing ICON’s former staking and issuance system. (icon.foundation)

Ecosystem & Use Cases

Applications built around ICON

ICON supported applications beyond simple coin transfers. Balanced brought swaps, loans, and a collateral-backed stablecoin called bnUSD to the ecosystem. Wallets such as Hana helped people hold assets and use applications. ICON also supported developers building tokens and other services through smart contracts. These projects gave ICX uses beyond paying the fee for an ordinary transfer. (coingecko.com)

The project also explored uses for institutions, including digital identity and document verification. In such systems, a blockchain record can help someone check whether a credential was issued and whether its record has changed. The original vision was broad: communities such as businesses, schools, and financial organizations could use their own systems while gaining a way to communicate with others. (icon.foundation)

SODAX builds on the cross-chain side of that history. Its tools are designed to coordinate swaps, lending, borrowing, and messages across supported networks. Developers can use its software tools to add cross-network features to their own applications. This change makes ICON’s earlier products and design choices useful context for understanding the platform that followed it. (icon.foundation)

Advantages & Challenges

ICON’s main contribution was bringing smart contracts and cross-chain communication together in one project. Delegated staking gave coin holders a way to support governance, while Java SCOREs gave developers a widely used language for building applications. BTP and xCall addressed a practical problem: separate blockchains need shared ways to send instructions if their applications are to work together. (icon.community)

The same goal brought technical challenges. Cross-chain actions require several systems to handle messages correctly. In August 2026, an error in an ICON migration contract allowed previously signed withdrawal messages to be replayed. The network was temporarily halted, and the foundation reported that it deployed a fix before operations resumed. The transition also changes the shape of ICON’s governance: the broad validator and reward model of its active years has given way to a seven-node maintenance network while ICX moves to SODA. (icon.foundation)

Where to Buy & Wallets

ICX can be purchased on Kraken and Bitvavo, subject to each platform’s supported regions and services. Exchange support is changing during the move to SODA; Binance’s ICX page says the coin is no longer listed for spot trading on its main exchange. A purchase of ICX and a conversion to SODA are separate actions, and they result in tokens on different blockchains. (kraken.com)

Hana Wallet and ICONex support ICX on the ICON network. Hana can also connect with a Ledger hardware wallet, while ICONex is the foundation’s original browser-extension wallet. The project’s migration service converts eligible ICX into SODA on Sonic. Transactions made with SODA on Sonic use S, Sonic’s native coin, for network fees. (icon.community)

Regulatory & Compliance

The ICON Foundation is a Swiss nonprofit based in Zug. During the 2017 token sale, it used identity checks and excluded participants of certain nationalities, including those of the United States, China, and Singapore. Token rules depend on jurisdiction and on how a token or related service functions. Switzerland’s financial regulator, FINMA, distinguishes among payment, utility, and asset tokens when applying its rules. (icon.foundation)

In the European Union, the foundation published a SODA crypto-asset whitepaper under the Markets in Crypto-Assets framework in 2026. That filing describes SODA as a utility token replacing ICX through a voluntary one-for-one migration. It addresses SODA’s proposed admission to trading in the EU; the token involved in that filing is SODA on Sonic. (icon.foundation)

For Islamic finance, Sharlife, a Malaysian Shariah screening service, classifies ICX as Shariah-compliant. Its assessment points to the coin’s payment and staking functions. Activities built around a token can have different terms: a transfer, a swap, and a lending arrangement do different things. Shariah assessment of a particular SODAX service therefore turns on how that service operates, alongside any assessment of the token itself. (sharlife.my)

Future Outlook

ICON’s announced path is specific. Its blockchain is scheduled to stop on December 31, 2026, when the ICX-to-SODA migration window also closes. A read-only archive is planned for historical transaction records. Until then, the maintenance-mode chain serves as the route for remaining ICX transfers and conversion. (icon.foundation)

The longer-running part of ICON’s work is its effort to make separate networks easier to use together. SODAX carries that aim forward through cross-chain messaging, developer tools, and financial applications based on Sonic. The shift shows how a project that began by building its own blockchain can reuse its ideas and technology within a different structure. (icon.foundation)

Summary

ICON began as a smart-contract blockchain with ICX at the center of its fees, governance, and applications. Its best-known work focused on helping independent blockchains communicate. In 2026, ICX is in the final stage of a one-for-one migration to SODA, and ICON’s network is scheduled to close at year’s end. Its place in the crypto ecosystem rests on the chain it built and the cross-chain tools that continue through SODAX. (icon.community)