Stablecoin is a token designed to track the value of a fiat currency, like USD, as closely as possible. But that doesn't mean a stablecoin is risk-free — it can carry reserve transparency risk, issuer risk, depeg risk, and regulation risk.
Token supply is about looking at things like total supply, circulating supply, the mint/burn mechanism, vesting schedule, and holder distribution. Meme coins tend to run on hype more than utility, so their volatility can be extremely high.
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A stablecoin is designed to be stable — that's not a guarantee. Understanding tokenomics is what lets you actually see the risk.