Oracles

What are oracles?

xSynth utilizes the decentralized Chainlink oracle network & Pyth oracle network, which provides up-to-date token prices data to smart contracts on Polygon and Ethereum Mainnet.

Responsibilities of an oracle

• Updates, stores, and distributes up-to-date token prices relevant to the system.

• Disables exchange functionality if prices are not fresh.

• Provides functionality to perform exchange rate conversions between synth flavors.

How does xSynth utilize oracles?

The xSynth protocol utilizes its respective ExchangeRates contract to retrieve frequently stored price updates.

xSynth Oracle Contracts

At xSynth, the on-chain manifestation of the oracle is the ExchangeRates contract, which stores prices that are frequently updated by the oracle. The primary user of these prices is the Synthetix contract, which needs them to calculate debt allocations when issuing and burning synths, and to determine the correct quantity of synths when performing an exchange of one flavour for another.

It is also used by some other contracts, such as the Depot and PurgeableSynth contracts.

Constituent Contracts

Contract	Description
Oracle	The oracle is responsible for collecting and updating all token prices known to the xSynth system. Although it is not a contract, it controls a known Ethereum address from which price updates are sent to the ExchangeRates contract.
ExchangeRates	The xSynth exchange rates contract which receives token prices from the oracle, and supplies them to all contracts that need it.