What Is a Stablecoin, and Who Backs It?
Part of the guide: Money for AI agents: spend, save, and Lightning
Think of a cloakroom ticket. The ticket is useful because someone promises to hand something back. Printing a magnificent ticket does not improve the cloakroom. Even gold lettering cannot rescue a coat rack made of spaghetti. A reserve-backed stablecoin has a similar split: token, promise, backing.
The 10-second version
- A dollar stablecoin aims to stay worth a dollar. That target is often called its peg. A target is not an assured market price.
- The issuer makes the redemption promise. Redemption means exchanging the token back for the money it represents.
- Reserves support that promise. Government rules about reserves do not turn the token into government-guaranteed money.
Sources: GENIUS Act, enacted text and BIS Bulletin 73, checked 2026-10-18.
Who owes the money?
For the reserve-backed payment stablecoins discussed here, the issuer is the party behind the redemption obligation. The token is what moves between holders; the reserve assets support the issuer's promise. Those are different jobs.
[Your token] → [Issuer promises redemption] → [Reserves support the promise]
Who runs the cloakroom?
That diagram is an analogy, not a description of every stablecoin design. The GENIUS Act defines payment stablecoins around an issuer's obligation to redeem for a fixed monetary amount and its representation of stable value. It also requires permitted issuers to publish redemption procedures and fees. The label alone does not explain the cash-out process.
What counts as backing?
Section 4 of the enacted law specifies identifiable reserves of at least 1:1 for permitted payment stablecoin issuers. Eligible assets include cash, withdrawable bank deposits and short-term Treasury securities. Backing does not necessarily mean paper dollars sleeping in a vault.
The overlooked detail: monthly reserve disclosures must include amounts, composition, average tenor and the geographic location of custody for each reserve category. In everyday language: what is there, how long until it matures, and where it is held.
These are statutory requirements. They are not evidence that a particular issuer has complied. The law also has a separate effective-date provision; this note does not verify the current implementation timetable.
Why can the price wobble?
The authors of BIS Bulletin 73 explain that stablecoins circulating as bearer instruments can trade away from par. Par means the promised face value. The price someone offers for your token and the issuer's redemption promise are separate things.
In his Fed speech, Michael Barr explains why reserve quality and liquidity matter. Liquidity means being able to turn assets into money promptly. If holders rush to redeem, even assets considered high quality can face stress. He also notes that stablecoins lack deposit insurance. A reserve portfolio is not a government rescue promise.
What we did not check
We did not inspect any issuer's reserves, custody accounts or redemption terms. Issuer compliance and individual holders' cash-out eligibility remain unverified here. We did not rank brands or check every stablecoin design. Barr explicitly warns that the law does not cover everything commonly called a stablecoin.
The honest trade
Sources
- Congress.gov, GENIUS Act, enacted text (checked 2026-10-18)
- Federal Reserve, Michael Barr on payment technologies and stablecoins (checked 2026-10-18)
- BIS Bulletin 73, Stablecoins versus tokenised deposits (checked 2026-10-18)