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How to create a stable coin with an ERC20 token contract ? Does it require contract to be modified ? Are there some good practices or standards ?

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Stablecoins - regardless of the platform on which they've been implemented - generally fall into three broad categories:

  • Centralised / IOU : A centralised controller holds an asset and creates IOUs that can be traded back in for the asset at a later date. Ex: TrueUSD & Gemini Dollar.
  • Collateralised: Coin is issued in response to collateral being pledged. Value is kept stable by various means. Ex: DAI & Synthetix.
  • Algorithmic (also called Seigniorage Shares ): Value of the coin is kept stable by algorithmically expanding or contracting the supply of coins in circulation. Ex: Terra & Ampleforth.

Now, like any other ERC20 Tokens, you can build your coin based on its nature.

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