ExchangeRateFeeder

The ExchangeRateFeeder contract is responsible for calculating and determining the exchange rate between an Ethereum stablecoin and their aTerra counterpart.

Events

RateUpdated

Emitted when exchange rate is updated.

event RateUpdated(
    address indexed _operator,
    address indexed _token,
    uint256 _before,
    uint256 _after,
    uint256 _updateCount
);

Key	Type	Description
_operator	address	Address that updated the exchange rate
_token	address	Address of token that had its exchange rate updated
_before	uint256	Exchange rate value pre-update
_after	uint256	Exchange rate value post-update
_updateCount	uint256	Number of times that interest was compounded during the update

State

Status

Represents the exchange rate updatability for a stablecoin.

enum Status {NEUTRAL, RUNNING, STOPPED}

Key	Description
NEUTRAL	Set when a stablecoin was first added
RUNNING	Exchange rate of stablecoin available for updates
STOPPED	Set when exchange rate updates for this stablecoin is stopped

Token

Represents information for an aTerra token.

struct Token {
    Status status;
    uint256 exchangeRate;
    uint256 period;
    uint256 weight;
    uint256 lastUpdatedAt;
}

Key	Type	Description
status	Status	Exchange rate updatability status
exchangeRate	uint256	Exchange rate when the exchange rate was last updated.
period	uint256	Minimum time period required between exchange rate updates
weight	uint256	Interest rate per period of time
lastUpdated	uint256	Block timestamp when exchange rate was last updated

Functions

exchangeRateOf

Gets the exchange rate for the specified aTerra token. Returns a simulated value (reflects yield accrued since last exchange rate update) if _simulate is set as true. Returns the last updated exchange rate value is _simulate is set as false.

function exchangeRateOf(
    address _token, 
    bool _simulate
) external view returns (uint256);

Key	Type	Description
_token	address	Address of aTerra token to retrieve exchange rate
_simulate	bool	Indicator on whether to return a interest-accrued value

update

Updates the exchange rate for specified aTerra token.

function update(address _token) external;

Key	Type	Description
_token	address	Address of aTerra token to update exchange rate