What Is ICON (ICX)? BTP, xCall, and the SODAX Transition

What ICON and the ICX Token Set Out to Do

In 2017, most blockchain teams were building islands. Each network had its own rules, its own assets, and no way to talk to anything outside its borders. ICON was founded in South Korea with a different goal: connect everything. The project launched with a vision it called "hyperconnecting the world," building infrastructure to link institutional blockchains, government systems, hospital networks, and public chains into one coherent ecosystem through a single protocol.

Min Kim, who previously worked at DAYLI Financial Group and Deutsche Bank, co-founded ICON alongside the Korean enterprise development firm ICONLOOP. The 2017 ICO raised 150,000 ETH, roughly $42.75 million at the time, by selling half of the total ICX supply. ICX served as the gas token and governance layer for the ICON mainnet, and early stakers earned a share of the 3.99% annual inflation under the IISS 3.1 model, split between voters, block producers, the Community Priority System Fund, and relay operators.

For several years, ICON remained one of the more technically serious interoperability projects in crypto. That changed when the team made a decisive pivot, not just to a new product, but to an entirely new chain.

How BTP and xCall Actually Work

The technical foundation ICON built over seven years centers on two components. The first is BTP, the Blockchain Transmission Protocol, a native messaging layer designed for secure and trustless cross-chain communication without relying on intermediary oracles. BTP handles asset transfers and contract calls between ICON and connected networks at the protocol level.

The second is xCall, also called ICON General Message Passing. Where BTP is one specific wire, xCall is the socket that accepts many wires. It sits as a standardized abstraction layer above multiple underlying interoperability protocols — IBC, BTP, Wormhole, LayerZero, and ICON's Central Relay all plug in underneath. Developers building on xCall write once and route across any supported protocol without touching each one individually.

This architecture positions ICON not as a competitor to LayerZero or Wormhole but as a layer above them. Applications using xCall inherit the security properties of whichever underlying protocol routes the message, while the developer interface stays consistent.

ICON's Pivot to SODAX and the End of ICX Emissions

In 2025, the ICON Foundation announced that building interoperability infrastructure was only half the job. The team decided to apply everything they had built — BTP, xCall, cross-chain routing — to a live DeFi product. The result was SODAX, a cross-chain DeFi platform migrated off the ICON L1 and onto Sonic, a high-throughput EVM chain.

SODAX offers intent-based swaps, lending, and borrowing across more than 12 connected chains, including Arbitrum, Stellar, Sui, and chains in the Cosmos ecosystem. The core design principle is Protocol-Owned Liquidity. Rather than renting liquidity from yield farmers who leave at the first sign of a better rate, SODAX holds its own liquidity pool permanently. This removes the bridge dependency and the mercenary TVL problem in one move.

The pivot had a direct consequence for ICX holders: token emissions ended permanently on March 26, 2026. The inflationary staking model that had distributed rewards to validators and voters since 2017 was switched off. What replaced it was a fundamentally different economic design.

The ICX to SODA Migration

ICX holders migrate to SODA at a 1:1 ratio through sodax.com/migrate. The ICON L1 remains live during the transition period and the migration is currently two-way, meaning holders are not forced to act under time pressure. However, the direction of value is clearly moving toward SODA, where the protocol activity and fee generation now live.

SODA has a hard-capped maximum supply of 1.5 billion tokens, replacing the inflationary ICX model entirely. Staking rewards no longer come from new token issuance. Instead, stakers receive a 20% share of all fees generated by SODAX's swaps, lending, and borrowing activity. SODAX Stake launched March 16, 2026, with reward distributions beginning April 8. SODAX Pool launched March 24 with distributions from April 2.

The shift from inflation-based to fee-based rewards is structurally significant. The yield paid to stakers is a function of actual protocol usage. If SODAX grows its trading volume and borrowing demand, staking yield grows with it.

Image by Sodax

Where SODAX Fits in the Cross-Chain DeFi Landscape

The cross-chain DeFi space has matured into distinct categories. Bridge protocols move assets. Aggregators route through bridges on behalf of users. Protocol-Owned Liquidity systems own the liquidity themselves and avoid the bridge layer entirely. SODAX competes in that third category.

The distinction matters for longevity. Bridge-dependent platforms carry counterparty risk every time a user crosses a chain boundary. POL platforms internalize that risk by owning what they route through. SODAX's Solver SDK handles the complexity — gas abstraction, asset wrapping, slippage optimization — and presents users with a single interface regardless of which chains are involved.

ICON spent seven years building the infrastructure layer. SODAX is the first real test of whether that infrastructure drives a sticky financial product. To track the current SODA token value as the migration plays out, the crypto price calculator on LBank can help convert positions across assets.