Price Oracle

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Price Oracle
Polygon Contract Address
​View on Polygonscan​
Source Code
​PriceOracle.sol​
Overview
The PriceOracle performs two necessary functions for the SIREN protocol:
First and most importantly, the PriceOracle stores the settlement price at expiration for every Series' underlying asset. On every Friday at 8am UTC, an offchain bot process is scheduled to fetch and set the current price for every asset traded on the SIREN protocol. Since all Series' expiration dates are aligned to Friday 8am UTC, this allows any expired Series to fetch the settlement price of the underlying token at expiration and use it along with the Series' strike price to calculate the payouts for bToken and wToken holders.
Second, the PriceOracle gives all other protocol contracts a single place to access onchain price data. Currently we use only Chainlink's oracles, but other's like Uniswap V3 could easily be used. Contracts like the MinterAmm and SeriesController use the PriceOracle to fetch the current price for the tokens they use. It simplifies the protocol when all other contracts need only have a single address with a known interface for fetching onchain prices.
Functions
Modifiers
onlyOwner
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  modifier onlyOwner() {
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    require(
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        hasRole(DEFAULT_ADMIN_ROLE, msg.sender),
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        "ERC1155Controller: Caller is not the owner"
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    );
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​
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    _;
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  }
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Certain functions can only be called by the SIREN protocol owner multisig address. The function addTokenPair](#addTokenPair) exist so that as [MinterAmm`s with new underlying tokens and price tokens are deployed, we can add the correct price oracles for these token pairs. If this function was callable by any address, than a malicious address could set their own malicious price oracle, and attack the protocol.
The functions updateImplementation and transferOwnership exist so that the owners can update the contracts in the event of a critical vulnerability that puts user's funds at risk.
View/Pure Functions
getSettlementPrice
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  function getSettlementPrice(
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    address underlyingToken,
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    address priceToken,
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    uint256 settlementDate
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  ) external view override returns (bool, uint256)
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Returns the settlement price of the underlying token denominated in units of the priceToken at the given settlementDate. The SeriesController](series-controller.md#overview) uses this price to compute the [payouts](glossary.md#option-payouts) for [option tokens](glossary.md#option-tokens). Only token pairs which have been previously added by an admin-only call to [addTokenPair` will execute successfully.
The settlement price is set by an offchain bot process every Friday 8am UTC, because all Series expiration dates are aligned to Friday 8am UTC. See the setting the settlement price section for more details on how this price is set.
Parameters
Name
Type
Description
underlyingToken
address
An ERC20 token address
priceToken
address
An ERC20 token address
settlementDate
uint256
A block timestamp (i.e. seconds after epoch) that must be aligned to 8am Friday UTC
Return Values
Name
Type
Description
isSet
bool
true if a call to [setSettlementPrice](#setSettlementPrice) has previously been executed and set the price to a non-zero value, otherwise it is false`
settlementPrice
uint256
The price of the given token pair at the given settlementDate
getCurrentPrice
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  function getCurrentPrice(
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    address underlyingToken,
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    address priceToken
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  ) public view override returns (uint256)
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Returns the current price of the underlying token denominated in units of the priceToken. For example, if the current price of WBTC was $34,000, then the value returned by PriceOracle.getCurrentPrice for a WBTC Series would be 34_000 * 1e8. Only token pairs which have been previously added by an admin-only call to addTokenPair will execute successfully. The PriceOracle fetches this price from an onchain oracle, which for now our all Chainlink Oracles.
Parameters
Name
Type
Description
underlyingToken
address
An ERC20 token address
priceToken
address
An ERC20 token address
getFriday8amAlignedDate
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  function getFriday8amAlignedDate(uint256 _timestamp)
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    public
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    pure
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    override
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    returns (uint256)
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Returns the block timestamp of the first Friday 8am UTC date prior to _timestamp. The SeriesController uses this function to ensure the expiration dates of each of its Series is aligned to Friday 8am UTC. The SIREN protocol uses a single date for each week's expiration dates in order to standardize the times at which its Series expire.
Parameters
Name
Type
Description
_timestamp
uint256
The block timestamp which will be used to find the prior Friday 8am UTC aligned block timestamp
Mutating Functions
setSettlementPrice
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  function setSettlementPrice(address underlyingToken, address priceToken)
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    external
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    override
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Sets all prior [Friday 8am UTC] settlement dates that have not yet been set by first fetching the current price of the underlyingToken denominated in units of priceToken, and setting all previous unset settlement dates. This function is intended to be called immediately after every Friday 8am UTC for each of the PriceOracle's token pairs, so that every Series that has their expiration date on that Frodau 8am UTC date will have the correct settlement date set. For now, an offchain bot process managed by the Siren team is scheduled to call this function for each token pair.
Parameters
Name
Type
Description
underlyingToken
address
An ERC20 token address
priceToken
address
An ERC20 token address
addTokenPair
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  function addTokenPair(
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    address underlyingToken,
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    address priceToken,
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    address oracle
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  ) external onlyOwner
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Sets the oracle as the price oracle to use for the given token pair of underlyingToken and priceToken. This function uses the onlyOwner modifier in order to prevent an malicious address from setting a malicious oracle for a given token pair. Once a token pair has been added with addTokenPair, the getCurrentPrice, setSettlementPrice and getSettlementPrice functions can be called with the given token pair.
Parameters
Name
Type
Description
underlyingToken
address
An ERC20 token address
priceToken
address
An ERC20 token address
oracle
address
The address of the onchain oracle to use when fetching current prices for this token pair
updateImplementation
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  function updateImplementation(
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    address _newImplementation
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  ) external onlyOwner
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Updates this PriceOracle's logic contract. The SIREN protocol's contracts use the EIP-1822 standard for implementing upgradeable contracts. This allows us to update vulnerable contracts and keep users' option tokens safe. When the SIREN protocol has reached a certain level of stability, we can remove these safety guards and ensure no one on the Siren team can swap out the smart contract functionality.
Parameters
Name
Type
Description
_newImplementation
address
The address of the new logic contract to use for the PriceOracle's function implementations
transferOwnership
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  function transferOwnership(address newOwner) public virtual onlyOwner
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Removes ownership from the current owner and assigns ownership to the newOwner address. See the onlyOwner modifier for the permissions granted to the protocol admin.
Parameters
Name
Type
Description
newOwner
address
The address of the new admin for this contract
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Last modified 6mo ago
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