A stablecoin is a digital asset built to hold a fixed value by pegging its price to another asset, most often a fiat currency like the U.S. dollar. The rules that determine what an issuer must hold to back every stablecoin it puts into circulation are called reserve requirements. Major jurisdictions are now writing those rules.
How a price peg works
Pegging means promising a fixed exchange rate. A stablecoin that promises one-to-one parity with the U.S. dollar requires the issuer to hold enough assets to honor that promise when any holder wants to redeem. The peg does not sustain itself. The reserve does.
A stablecoin's displayed price can hold at one dollar whether the issuer holds assets that are easily redeemable or assets that are difficult to convert quickly. From the outside, the price looks the same. The reserve is what determines whether the price is a real commitment or a stated intention.
What reserve requirements actually govern
Reserve requirements specify which assets count as backing and how much of the total coin supply must be covered at any given time. They define, in legal terms, what an issuer means when it says a stablecoin is backed. Without such rules, that word describes whatever the issuer chooses to hold behind its coins.
An issuer operating under strict reserve requirements carries a different legal obligation than one operating in a jurisdiction with no framework. The coin's price claim may look identical. The underlying guarantee is not.
Why major jurisdictions are now setting those rules
Major jurisdictions are building stablecoin reserve frameworks because the consequence of a broken peg falls on the people holding the coin. Reserve requirements are an effort to require adequate backing before pressure builds, so that redemptions can actually be honored when demand arrives.
Every stablecoin in circulation is a claim on an underlying asset. Reserve rules determine whether that claim is covered. Without a framework, the word "stable" is a description of intent, not a legal guarantee.