Synthetic assets on blockchain: Mirror Protocol and Synthetix explained

Synthetic assets have moved from a niche experiment in decentralised finance to one of the most discussed instruments in the crypto economy. By replicating the price behaviour of equities, commodities, and fiat currencies through tokenised representations, they offer traders exposure to traditional markets without needing a broker, a custodian, or a bank account in any particular jurisdiction.

Two protocols dominate conversations about this technology: Mirror Protocol, which launched on the Terra blockchain, and Synthetix, which has operated on Ethereum since 2018. Both attempt to solve the same fundamental problem, how to bring off-chain price action on-chain, but they diverge sharply in architecture, collateral models, and the regulatory shadows they cast over users in places like Australia.

For Australian investors, the appeal is straightforward. The local market offers deep liquidity in major equities through the ASX, yet retail traders often face barriers to short selling, leveraged products, and foreign assets. Synthetic tokens promise a parallel venue that runs twenty-four hours a day and settles in crypto, even if the underlying reference points, like Apple shares or gold, trade in New York or London.

The mechanics of synthetic asset creation

At its core, a synthetic asset is a token whose value is pegged to something else. The "something else" can be a stock, an index, a commodity, or even another cryptocurrency. The token itself does not confer ownership of the underlying instrument. Instead, it mirrors price movement through a combination of collateral, oracles, and arbitrage incentives.

Most protocols require users to lock up collateral worth more than the value of the synthetic position they want to take. If a trader wants exposure to one synthetic Tesla token, for instance, they might deposit crypto collateral worth 150 percent of the position. This over-collateralisation absorbs volatility and protects the system from sudden price gaps, a feature that has become standard across decentralised finance platforms accessible from Sydney, Melbourne, or Perth.

The price feed itself comes from external oracles, services that pull real-world market data onto the blockchain. When the oracle reports a new price for an asset, smart contracts adjust the synthetic token accordingly. Without reliable oracles, the entire premise collapses, which is why protocol teams spend considerable resources securing redundant data sources.

Inside Mirror Protocol's Terra-based design

Mirror Protocol emerged in late 2020 as one of the flagship applications built on Terra, a blockchain focused on stablecoin payments. It allowed users to mint "mirrored assets," known as mAssets, that tracked US equities and other instruments. TerraUSD (UST) served as the primary collateral, supported by a basket of other cryptos locked into smart contracts.

Users could create mAssets by depositing collateral into a contract, or they could purchase them on secondary markets such as Terraswap. The protocol also introduced Mirror Tokens (MIR) for governance and liquidity provision, rewarding participants who helped maintain price alignment through arbitrage trades.

Mirror's collapse in May 2022, following the depeg of UST, underscored the fragility of synthetic systems that rely heavily on a single collateral type. Australian traders who held positions during that period learned quickly that the oracle can report a price while the underlying collateral evaporates, a distinction that matters when exchanges in Brisbane or Adelaide process withdrawals in Australian dollars.

How Synthetix powers decentralised derivatives

Synthetix takes a different approach, using a multi-collateral system built on Ethereum and later on Optimism, a layer-2 scaling network. Instead of pairing individual positions with discrete collateral pools, the protocol aggregates user deposits into a shared debt pool. When one trader profits, another absorbs a proportional share of the loss.

The protocol supports a wide range of synthetic instruments, including forex pairs, commodities, and inverse tokens that move opposite to crypto prices. Synthetix's SNX token serves as the primary collateral, and stakers earn fees and inflation rewards for securing the system. Perps (perpetual futures) trading on Synthetix is facilitated through integrations with platforms such as Kwenta.

This pooled model allows for deeper liquidity and more efficient capital use than isolated pools, but it introduces a different risk: every staker's exposure rises and falls with the network's overall debt. For Australians weighing whether to stake through a local interface or a decentralised wallet, the trade-off comes down to convenience versus self-custody.

Liquidity pools, oracles, and price tracking

Both protocols depend on arbitrageurs to keep synthetic prices aligned with reality. When a synthetic Apple token trades below the real share price on a traditional exchange, traders buy the token cheaply and short the underlying asset, or redeem the synthetic for its collateral value at a profit. That buying pressure pushes the synthetic price back up.

Mirror used Chainlink oracles for its price feeds, while Synthetix relies on a combination of Chainlink and Pyth. The redundancy is intentional. If one oracle reports a faulty price, the protocol can ignore it and wait for confirmation, a safeguard that became critical during episodes of extreme volatility in 2022 and 2023.

For Australian users, the practical question is not just which oracle is more reliable but which protocol offers clearer pathways for tax reporting. The Australian Taxation Office treats synthetic assets as property, meaning capital gains or losses apply on disposal. Keeping clean records of minting, swapping, and burning events is essential, especially when transactions touch multiple chains.

Australian regulation and investor considerations

ASIC has taken an increasingly active stance on crypto-derivatives products offered to retail clients. Several Australian exchanges have delisted leveraged tokens and perpetual swaps in response, pushing sophisticated traders toward decentralised alternatives such as Synthetix perps.

AUSTRAC registration also applies to digital currency exchanges serving Australian customers, which is why platforms like BTC Markets, Independent Reserve, and Swyftx have built compliance frameworks that local users recognise. Decentralised protocols sit in a grey zone: the code runs without an intermediary, but anyone marketing synthetic products to Australian residents still falls within the regulator's reach.

The local appetite for synthetic exposure remains strong, particularly among traders in Sydney and Melbourne who want access to US tech stocks outside ASX trading hours. The same hunger for real-time, automated systems is playing out across other emerging sectors in Australia, where cultivators are turning to automated fertigation and pH control to bring precision agriculture to legal cannabis operations. As the synthetic asset market matures, the gap between regulated centralised venues and decentralised synthetics is likely to narrow, either through clearer rules or through platforms that bridge both worlds.

The most important thing to remember is that synthetic assets are only as strong as their collateral, their oracles, and the regulatory environment around them. Mirror Protocol showed how quickly those pillars can fail when one element collapses. Synthetix offers a more resilient architecture but still exposes stakers to shared debt and oracle risk. Australian participants should weigh convenience against custody, and always assume that the price on-chain is only as trustworthy as the data feeding it.