Stablecoins vs volatile coins: what actually backs the dollar in your wallet

A stablecoin is a token engineered to be worth exactly one dollar, and it stays there only because someone is holding real assets they promise to hand over when you cash out, which makes it fundamentally different from a volatile coin whose price is simply whatever the market decides that minute. Get that distinction clear and most of the confusion around crypto "dollars" falls away. A volatile coin is a bet. A fiat-backed stablecoin is an IOU. The interesting question is never whether it is currently trading at a dollar. It is whether the IOU is good.

A volatile coin is a bet. A stablecoin is an IOU. The only question that matters is whether the IOU is good.

Two very different jobs

Bitcoin and Ether make no promise about their price. Nobody guarantees a Bitcoin will be worth the same tomorrow as today, and its whole design leans the other way: a fixed or predictable supply, a price set purely by supply and demand. That volatility is a feature for people betting on the asset and a bug for anyone who just wants to move value without watching it lurch. If you want to understand why some coins are built to be scarce rather than stable, our piece on what a fixed-supply cryptocurrency actually means unpacks that side.

A stablecoin is built for the opposite job: to sit still. The most common kind, a fiat-backed stablecoin, tries to hold one dollar by keeping a dollar's worth of safe assets in reserve for every token it issues. USDC and USDT are the two largest. When the system works, you can send one of these tokens across the world in minutes and the person on the other end receives something worth a dollar, because they can, in principle, redeem it for one. The stability is not magic. It is collateral plus a credible promise to honour redemptions.

Where "stable" actually comes from

The word stablecoin describes a goal, not a guarantee. There are a few designs, and they are not equally sturdy.

Fiat-backed. For every token, the issuer claims to hold roughly a dollar of cash or cash-equivalent assets. This is the dominant model and the easiest to verify, because the reserves are supposed to be real, external, and reported.

Crypto-collateralized. The token is backed by other crypto assets, usually over-collateralized to absorb price swings. More transparent on-chain, but exposed to the volatility of whatever backs it.

Algorithmic. The token tries to hold its peg through code and incentives rather than reserves. This is the fragile one. In 2022, the algorithmic stablecoin TerraUSD collapsed from a dollar to near zero in days, erasing tens of billions of dollars. "Stable" in the name guaranteed nothing. The mechanism did, and the mechanism failed.

What backs the big dollar tokens

Take USDC as a worked example, because it publishes enough to check. Circle, its issuer, states that USDC is backed by cash and short-dated US Treasuries, with the majority held in the Circle Reserve Fund, an SEC-registered government money market fund managed by BlackRock. Circle says a Big Four accounting firm provides monthly third-party assurance that reserves are at least equal to the USDC in circulation, and it engaged Deloitte as its auditor in January 2023. That is a reasonably strong posture, and importantly, it is one you can inspect rather than take on trust.

But strong is not the same as risk-free, and USDC itself proved it. In March 2023, USDC briefly slipped below a dollar after Circle disclosed that about 3.3 billion dollars of its reserves, roughly 8 percent, were sitting at Silicon Valley Bank when that bank failed. The token regained its peg within a few days once the funds were secured and moved. Nothing about USDC's code broke. The reserves were simply parked somewhere that wobbled, and the token wobbled with it. That is the whole lesson of stablecoins in one event: the token is only as safe as the place the money lives.

A stablecoin does not de-peg because the code failed. It de-pegs because the money behind it was somewhere it should not have been.

Tether's USDT is larger still and publishes reserve breakdowns and quarterly attestation reports. Worth knowing: an attestation is not the same as a full financial-statement audit. An attestation is a snapshot, a firm confirming figures at a point in time under agreed procedures. A full audit is a deeper, standardized examination. Neither USDC nor USDT should be read as a bank deposit. In Canada, a stablecoin is not covered by CDIC deposit insurance the way money in a chequing account is, so "backed by reserves" and "guaranteed" are not the same sentence.

How to verify the reserves yourself

Here is the part almost nobody does, and it takes about ten minutes. The principle is the same one behind all honest crypto: don't trust, verify. We wrote a fuller checklist in reading a crypto project honestly, but for a stablecoin specifically, work through these.

1. Find the transparency page

Every serious fiat-backed issuer has one. Circle publishes its reserve information and attestations; Tether publishes reserves and attestation reports. If a stablecoin has no such page, you have learned the most important thing already.

2. Read the latest attestation, not the marketing

Open the most recent report and check four things: who signed it, the date, whether it is an attestation or a full audit, and whether the reported reserves are at least equal to the tokens in circulation. A recent report from a recognized firm showing reserves at or above circulation is what good looks like. A vague blog post with a big number and no signature is not.

3. Look at what the reserves actually are

Cash and short-dated government debt are about as safe and liquid as reserves get. The further an issuer drifts into riskier or less liquid assets, the more you are trusting their judgment to sell those assets fast in a panic. You want to be able to picture exactly what would be sold to pay you back.

4. Match the tokens to the reserves on-chain

The number of tokens in existence is public. Open the stablecoin's contract on a block explorer, read the total supply, and compare it to the reserves figure in the attestation. They should line up. This is the single cross-check that ties the issuer's paperwork to the blockchain's reality, and it is free.

The honest bottom line

Stablecoins solve a real problem: moving dollar-like value on a blockchain without riding the volatility of a coin like Bitcoin. That is genuinely useful. But the stability is borrowed from the reserves, and reserves can be safe, risky, well-run, or fictional. The good news is that the better issuers make the answer checkable, which is exactly the standard to hold every one of them to, including any token you already hold. This same posture, public supply, real reserves, plain disclosure, is the one Bremo documents at bremo.tech, and the right response to any project claiming it is not to believe the claim but to go and confirm it.

A stablecoin asks you to accept that one token equals one dollar. That is a reasonable thing to accept, but only after you have seen the dollar. Go look for it.