🧵nASTR Price Feeds by DIA

nASTR Price Feeds was developed by the leading Oracle of the Polkadot Ecosystem : DIA Protocol.

Methodology:

nASTR price using collateral feed will be derived as follows:

• nASTR price = ASTR price * (ASTR in staking contracts/ nASTR total supply)

• ASTR in staking contracts will be derived by calling function getAstrInStakingContractFromAddress() on Astar DappsStaking contract.

• nASTR total supply will be derived by calling function totalSupply on nASTR token contract

DIA Oracle Contract:

Astar address details for 0x88463254469c37b9cECb71A34746707e008fb5A9 | Blockscoutblockscout.com

To get the market price of ASTR/USD or nASTR/USD, query getValue() with argument “ASTR/USD” or “nASTR/USD”. Return values are the price (with 8 decimals, so divide by 10^8 to get the actual price) and unix timestamp of last update. Prices will update as soon as 1% change is detected.

Algem adapter Contract:

Astar address details for 0x8e066de9a3B0ac5965e4361fDE2752c11509f4F2 | Blockscoutblockscout.com

The contract connects the ASTR/USD price to onchain collateral information.

Call getNAstrPriceFromCollateralRatio() to get the latest price from the collateral ratio and getAstrInAllStakingContracts() to retrieve the number of staked ASTR in all registered contracts.

More details can be found on DIA's forum:

CDR #033: Algem | Price FeedsDIA Forum | Cross-Chain Oracles for Web3