Crypto trading · Beginner

Stablecoins Explained

Holding a stablecoin is lending an issuer money at zero interest, which makes a parked balance a credit decision rather than cash.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

In short

A stablecoin is a cryptocurrency designed to track a fiat currency, usually the US dollar, so traders can price pairs and hold value without leaving crypto. Stability comes from a mechanism: fiat reserves, crypto collateral, or algorithmic supply control. Each can fail under stress, and pegs have broken by a few tenths of a percent and, in some designs, entirely.

What to remember

A parked stablecoin balance is an open position. A 5% de-peg on 8,000 USD costs 400 USD with no trade on and no stop to hit.
The three designs fail differently. Fiat-backed fails on the reserve, crypto-collateralised fails on a correlated crash, and algorithmic fails on a confidence spiral.
An attestation is a balance confirmation on one date, not an audit. Check composition, frequency, and who is actually allowed to redeem at par.
De-pegs happen during market stress, which is exactly when you wanted that balance available to buy.

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A peg is a design goal, not a property of the asset

A stablecoin is a cryptocurrency built to hold a steady value, almost always one US dollar. It exists so the market has a unit to price things in and a place to sit between trades without moving money back through a bank. Most crypto pairs you will ever trade are quoted in one, which means a stablecoin is not an optional part of your exposure. It is the denominator of nearly everything you do.

The word stable describes the intention of the design. It is not a guarantee delivered by the asset, and the distinction is the whole lesson. A peg is maintained by a mechanism, and mechanisms have conditions under which they stop working.

What a 5% de-peg costs a position you thought was flat

You sell a position and hold 8,000 USD in a dollar-pegged stablecoin, waiting for a setup. By your own accounting you are in cash and out of the market. Over a weekend the coin trades at 0.95 as redemption doubts spread.

Your 8,000 is now worth 7,600. You did not have a position on, you had no stop to be hit, and the loss is 400 USD, four times the 100 USD you would have risked on a normal trade at 1% of a 10,000 USD account. Worse, the moment is exactly when you want to buy: the de-peg happens during market stress, so the setup you were waiting for arrives with your dry powder impaired. And if you try to exit into another stablecoin, you pay the de-peg again in the spread, because everyone else is doing the same thing.

Historical de-pegs have ranged from a few tenths of a percent lasting minutes, which is noise, to complete and permanent collapse. Both happened within the same eighteen-month window in this market. Sizing the parked balance as though it were a bank deposit ignores the difference.

Three ways to hold a dollar, three failure modes

Fiat-backed. The issuer holds cash and short-term government paper intended to match the coins outstanding, and redeems one for one. The failure mode is the reserve: what is actually in it, who verified that, and whether redemption works for you or only for large institutional clients.
Crypto-collateralised. Backed by other digital assets, usually over-collateralised so a fall in the collateral does not immediately break the peg. The failure mode is a fast, correlated crash in the collateral, which is precisely the environment in which you need the peg to hold.
Algorithmic. The peg is defended by automated supply expansion and contraction rather than by reserves. The failure mode is a confidence spiral: the mechanism relies on someone being willing to arbitrage it, and when that willingness disappears there is nothing underneath. Multiple large algorithmic designs have gone to near zero.

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Reading a reserve attestation without over-trusting it

Fiat-backed issuers publish attestations, and these are useful and frequently misread. An attestation is an accountant confirming the balances reported on a particular date. It is not a full audit, it does not follow the money for the rest of the month, and it says nothing about liquidity under stress.

Look at three things. The composition, because cash and short-dated treasury bills behave very differently from commercial paper or loans in a run. The date and frequency, because a quarterly snapshot tells you little about today. And the redemption terms, because a peg is ultimately defended by arbitrageurs redeeming at par, and if only clients above a large minimum can redeem, retail holders are relying on a secondary market rather than on the reserve.

Parking cash in a stablecoin is a credit decision

This is the reframing that changes behaviour. Holding a stablecoin is lending money to an issuer, unsecured, at zero interest, with the right to demand a dollar back. In any other market you would call that short-term credit exposure, the sense in which the trading glossary defines counterparty risk, and you would care who the borrower was.

So treat it that way. Split large parked balances across more than one issuer, in the same way you would not hold all your cash at one small bank. Know which model you are holding and do not assume that two tickers on the same exchange screen carry the same risk. And be aware that yields offered on stablecoin deposits are paid for by someone taking risk with your balance, which is a second credit decision stacked on the first.

Practical rules for stablecoin exposure

Count it as a position. Include parked stablecoin balances in your exposure review rather than in a mental cash column.
Prefer the largest, most liquid issuers for working balances, and keep long-term savings out of the asset class entirely if a dollar is what you actually want.
Watch the pair, not the label. If a stablecoin is trading at 0.997 on the venue you use, your quote currency has already moved and every price on that screen is shifted.
Do not chase yield on a parked balance. A few percent of interest is a poor trade against the loss of the principal you were holding precisely to keep it intact.
Have a second route out. Know in advance how you would convert to fiat or to a different issuer if the primary one is impaired, because that is not a plan you can make during the event.

None of this makes stablecoins unusable. They are the plumbing of the market and you will use them constantly. It makes them a considered exposure rather than an assumed one, which is the same discipline the risk management guide applies to everything else you hold.

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Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

FAQ

Stablecoins Explained: questions

Are stablecoins actually safe to hold?

They are safer than volatile crypto assets and less safe than a bank deposit, and the gap depends entirely on the issuer. Fiat-backed coins from large issuers have generally held their peg with brief exceptions, while several algorithmic designs have failed completely. Holding one is unsecured credit exposure to the issuer, so size it and split it the way you would any other credit decision.

What causes a stablecoin to lose its peg?

Doubt about whether the backing exists or can be accessed. For fiat-backed coins that means questions about reserve quality, a banking partner failing, or redemption being restricted. For crypto-collateralised coins it is a fast fall in the collateral. For algorithmic coins it is a loss of confidence in the mechanism itself, which removes the arbitrage that was holding the peg together.

Why do crypto exchanges quote prices in stablecoins?

Because moving actual dollars requires banks, and banking access for crypto venues is slow, expensive and inconsistent across jurisdictions. A dollar-pegged token settles in minutes at any hour and works identically everywhere. The consequence is that most crypto prices you see are denominated in a private issuer's liability rather than in central bank money, which is worth remembering when that liability wobbles.

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