Synthetic Asset

A synthetic asset is an instrument designed to give its holder the same economic exposure as another asset, such as a share, a commodity, a currency or an index, without actually owning it. The exposure is created by contracts rather than by holding the real thing: for example, by combining options, entering a swap, or holding a token whose value is set by a price feed. Investors and traders use synthetic assets to gain exposure that would otherwise be costly, restricted or unavailable, and to build positions that mix features of several instruments.

The term has two main uses. In traditional finance, it describes positions and products built from derivatives, such as a synthetic long stock position or a swap-based exchange-traded fund. In crypto and decentralized finance, it usually means a token, created through a smart contract and backed by collateral, that tracks the price of another asset. Synthetic assets are related to, but different from, wrapped tokens and tokenized securities, which are backed one-for-one by the real asset held in custody.

Suppose you want to follow the price of gold but cannot store gold bars. A friend who owns gold agrees: if gold rises, they will pay you the gain; if it falls, you will pay them the loss. You never touch any gold, yet your money moves just as if you owned some. That agreement is a synthetic version of gold.

Synthetic assets work the same way at scale. They copy the price behaviour of something else using promises and collateral rather than ownership. The copy can be useful and flexible, but it is only as good as the promise behind it: if the other side cannot pay, or the price used is wrong, the synthetic stops matching the real thing.

Professional traders have long built synthetic positions from simpler pieces. Buying a call option and selling a put option with the same strike price and expiry produces a position that behaves almost exactly like owning the share, a relationship known as put-call parity. Total return swaps let an investor receive the full return of a bond or equity index in exchange for paying a fee or interest rate, without buying the securities.

Some exchange-traded funds, especially in Europe, use synthetic replication: instead of holding all the shares in an index, the fund holds a basket of other securities and uses a swap with a bank to receive the index's return. A contract for difference, popular with retail traders in many countries, is another synthetic exposure. These structures can reduce costs and track hard-to-reach markets, but they add counterparty risk, since the investor depends on the bank or broker paying what it owes.

In DeFi, synthetic assets are created by protocols that let users lock up collateral and mint tokens tracking a price supplied by an oracle. The best-known example is Synthetix, which launched synthetic tokens tracking currencies, commodities and crypto assets, backed by stakers' collateral. Mirror Protocol, built on the Terra blockchain, offered synthetic versions of US shares until Terra's collapse in May 2022. More recent products include synthetic dollars, such as those designed by Ethena, which aim to hold a stable value through a mix of crypto collateral and offsetting derivatives positions; see synthetic dollar.

Typical features of crypto synthetics include:

• Over-collateralization. Users must lock more collateral than the value they mint, to absorb price swings.
• Liquidation. If collateral falls below a set ratio, positions can be closed automatically, a process similar to a collateralized debt position.
• Price feeds. The value of each synthetic depends on oracles reporting the price of the asset it tracks.

Synthetic assets allow users to gain exposure to assets that are hard to reach directly, such as foreign shares or commodities, to trade around the clock, to hedge existing holdings and to combine exposures in a single wallet. In crypto, synthetics were promoted as a way to bring traditional markets on-chain before regulated tokenized stocks became widely available.

Synthetic assets carry risks beyond those of the asset they track. Counterparty and collateral risk arises because the synthetic depends on someone, or some pool of collateral, honouring the payout. Oracle manipulation or failure can produce wrong prices, and several DeFi synthetic platforms have suffered losses from faulty feeds. Smart contract bugs, sharp market moves that trigger mass liquidations, and thin trading can all break the link to the underlying price. Holders of synthetics have no ownership rights in the real asset, such as votes or a claim in bankruptcy.

Regulators treat many synthetic products as derivatives or securities. In the United States, synthetic tokens tracking shares may fall under securities or swaps law, and the Securities and Exchange Commission's 2023 lawsuit against Terraform Labs included claims that Mirror Protocol's synthetic shares were security-based swaps offered without registration. In the European Union and the United Kingdom, contracts for difference sold to retail clients face leverage limits and risk warnings. As of November 2026, rules for crypto-based synthetic assets continue to evolve across jurisdictions.