Helio Protocol is an over-collateralized stablecoin protocol built on the BNB Chain. Its core mechanism resembles traditional over-collateralized stablecoin systems but distinguishes itself by converting locked BNB assets into Liquid Staking Derivatives (LSDs) to generate yield. This yield is then distributed to stakers and liquidity providers of its native stablecoin, HAY. While the protocol has not yet launched a governance token, it secured a $10 million investment from Binance in August.
Introduction to Over-Collateralized Stablecoins
Stablecoins have become a cornerstone of the cryptocurrency ecosystem, with total issuance exceeding $724 billion. Among these, fiat-collateralized stablecoins dominate the market. Over-collateralized stablecoins represent a mature subcategory, often classified within decentralized finance (DeFi) lending projects.
Pioneers like MakerDAO paved the way for this sector, with protocols like Liquity gaining rapid traction. Examples such as DAI and LUSD demonstrate the viability of well-designed over-collateralized stablecoins.
What is Helio Protocol?
Launched in May 2022, Helio Protocol went live on the BNB Chain in August of the same year. It allows users to mint its HAY stablecoin by locking BNB as collateral. This collateral is automatically converted into various BNB Liquid Staking Derivatives (LSDs) like snBNB, BNBx, stkBNB, and ankrBNB. The yield generated is channeled into a communal pool to reward those staking HAY or providing liquidity.
The protocol faced a significant challenge in December 2022 when an exploit in Ankr Protocol's aBNBc token led to massive unauthorized minting of HAY, crashing its price to $0.20. The team responded by buying back and burning approximately 15 million HAY tokens, successfully restoring its peg to $0.99.
In a strategic move, Helio merged with liquid staking platform Synclub in July, expanding its functionality. This was followed by a $10 million investment from Binance in August.
How Helio Protocol Works
Core Mechanism
At its heart, Helio is a Collateralized Debt Position (CDP) protocol. Users lock BNB (BUSD is no longer supported) to mint HAY. The locked BNB is converted into LSDs to earn staking rewards. After repaying their debt and interest, users can withdraw their collateral either as an LSD asset immediately or as native BNB after a 7-15 day unbonding period.
Maintaining the Peg
Unlike protocols with direct redemption mechanisms, Helio employs an interest rate model to maintain HAY's peg to $1 USD.
- When HAY trades above $1, borrowing rates and staking rewards are lowered. This encourages more minting, increasing supply to push the price down.
- When HAY trades below $1, borrowing rates and staking rewards are increased. This incentivizes debt repayment and burning of HAY, reducing supply to push the price up.
Liquidation Process
Helio uses a Dutch auction model for liquidations. When a position becomes undercollateralized, the collateral is auctioned off starting at a price provided by an oracle; this price gradually decreases over time until a buyer is found. The user who triggers the liquidation by starting the auction receives a fixed tip plus a percentage of the sale (the chip), paid from the protocol's HELIO token reserve.
Use Cases for the HAY Stablecoin
A stablecoin's utility is critical to its success. Currently, around 8.3 million HAY tokens are staked, offering an Annual Percentage Rate (APR) of 0.31%.
To boost adoption, the Helio team has implemented various incentive programs. These primarily involve liquidity mining incentives on several decentralized exchanges (DEXs). These incentives help stabilize HAY's price and encourage users to mint it by providing lucrative yield opportunities.
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Tokenomics and Future Distribution
Helio Protocol plans a dual-token economy:
- HAY: The decentralized, over-collateralized stablecoin.
- HELIO: The prospective governance token, designed for protocol incentives and community governance.
Although not yet launched, the whitepaper outlines a total supply of 1 billion HELIO tokens, allocated as follows:
- 60% to the Community
- 17% to the Ecosystem
- 10% to the Treasury
- 5% to Liquidity Providers
- 6% to Strategic Financing (with a 1-year cliff, then vesting over 7 years)
- 1% to the Team (with a 1-year cliff, then vesting over 7 years)
- 1% for Airdrops
Current Status and Future Roadmap
As one of the largest CDP protocols on the BNB Chain, Helio's Total Value Locked (TVL) peaked near $110 million. However, following the Ankr incident and a decline in BNB's price, its TVL now stands at over $4.7 million.
Helio's published roadmap outlines a two-phase plan for growth:
- Multi-Chain Expansion: Adding support for ETH as collateral and expanding to other networks like Ethereum, Arbitrum, and zkSync.
- Protocol Upgrades: Implementing contract upgrades to enhance the stability mechanisms for HAY.
The protocol faces significant challenges. The market for BNB liquid staking is currently limited due to lower staking yields. Expanding to Ethereum is a logical step, but the ETH LSD market is highly competitive and dominated by established players like Lido, making differentiation difficult.
Frequently Asked Questions
What is Helio Protocol?
Helio Protocol is a decentralized finance (DeFi) platform on the BNB Chain that allows users to mint the HAY stablecoin by over-collateralizing their BNB assets. It uniquely auto-converts collateral into yield-generating liquid staking derivatives.
How does HAY maintain its peg to the US dollar?
HAY maintains its peg through an algorithmic interest rate model. It adjusts borrowing costs and staking rewards to incentivize minting when the price is high and burning when the price is low, effectively managing its circulating supply.
What are the risks of using Helio?
Key risks include the volatility of BNB collateral (leading to liquidations), smart contract vulnerabilities, and potential de-pegging events for the HAY stablecoin, as witnessed during the Ankr exploit.
What is the difference between HAY and HELIO tokens?
HAY is the stablecoin used for transactions and savings within the ecosystem. HELIO is the planned governance token that will grant holders voting rights and be used for protocol incentives.
Can I use Ethereum (ETH) as collateral on Helio?
Not currently. While support for ETH collateral is a key part of Helio's published future roadmap, the protocol currently only accepts BNB.
How are liquidations handled?
Helio uses a Dutch auction liquidation system. Undercollateralized positions are auctioned off at a descending price, and a portion of the proceeds is used to reward the keeper who triggers the liquidation event.
Conclusion
Helio Protocol offers a familiar CDP model for minting a stablecoin on the BNB Chain. Its primary innovation lies in automatically leveraging liquid staking derivatives on locked collateral to generate extra yield for its users. However, it operates in a challenging environment with limited demand for BNB liquid staking and fierce competition in the broader stablecoin and LSD markets. Its future success likely depends on successful multi-chain expansion and carving out a unique value proposition.