Synthetic Asset

Synthetic assets bring real-world price exposure on-chain without custody of the underlying. Synthetix (launched 2018) pioneered DeFi synthetics: users stake SNX tokens as collateral (at 500%+ collateralization ratios) to mint synthetic assets like sUSD (synthetic dollar), sETH, sXAU (gold), and even synthetic stocks like sTSLA. A price oracle feeds the real-world price, and the synthetic token tracks it perfectly. Holders gain exact price exposure without owning the underlying — and can trade between any synthetics with zero slippage (trades against the protocol rather than a counterparty pool).

The collateralization model matters enormously. Synthetix uses a debt pool model: all SNX stakers collectively back all outstanding synthetics. If sETH appreciates significantly, the total debt pool grows and all stakers owe more. This global debt exposure creates complex risk dynamics. Mirror Protocol on Terra used a similar model for synthetic stocks — and when Terra/LUNA collapsed in May 2022, Mirror's synthetic stocks became worthless when the underlying collateral (UST) depegged to zero.

Alternative approaches include perpetual futures (which provide leveraged synthetic exposure without requiring physical ownership), oracle-collateralized CDPs, and structured product vaults. Perp protocols like GMX, dYdX, and Gains Network effectively offer synthetic asset trading through perpetual contracts. On-chain synthetic assets face regulatory uncertainty — many are classified as securities if they track regulated assets like US stocks. This is why some protocols geo-block US users and why Mirror Protocol's synthetic stocks were controversial.