How a stablecoin peg works

A stablecoin peg is an issuer's promise that one token equals one unit of a target asset — for USDT, one US dollar. Tether backs each token with reserves and lets verified customers redeem USDT for dollars at par. That redemption right is the peg.

Arbitrage does the day-to-day work. If USDT trades at $0.999 on an exchange, traders buy it and redeem at $1.00, and their buying pushes the price back. A depeg is what happens when that mechanism stops holding the market price — temporarily or, in the worst cases, permanently.

Most depegs are measured in fractions of a percent and minutes. The ones that matter are the rare deep discounts — and those are exactly the moments that decide what a large ticket is worth when you are selling USDT in Dubai through a licensed desk.

What a depeg means in the UAE

The dirham is pegged to the US dollar at 3.6725, a Central Bank of the UAE policy in place since 1997. USDT tracks the dollar, so the USDT/AED rate is the dirham peg multiplied by whatever USDT happens to be worth — our explainer on why the USDT/AED rate sits at 3.67 covers the mechanics.

At full peg, one million USDT is AED 3,672,500 before costs. If USDT trades at $0.98, the same wallet is worth AED 3,599,050 before costs. Nothing about settlement changes — AED still arrives by UAEFTS the same business day once your account is approved — but the market has already taken 2%.

This is why depeg risk sits with the seller, not the desk. A desk prices off the live market; it cannot pay out dollars the market no longer believes exist.

Notable depeg episodes

A depeg episode is a period when a stablecoin trades materially away from its target. The record so far splits cleanly into reserved, fiat-backed coins that recovered — and one algorithmic coin that did not.

• October 2018 — USDT to about $0.85. Doubts over Tether's reserves and banking knocked the price down; it recovered within weeks (public market data, as of September 2026).
• May 2022 — TerraUSD (UST) to near zero. An algorithmic stablecoin with no dollar reserves lost its peg permanently. The same week, USDT briefly traded near $0.95 while processing roughly $7bn of redemptions in 48 hours, per Tether's statement.
• March 2023 — USDC to about $0.87. Silicon Valley Bank failed holding part of Circle's reserves; the peg restored within days once the US deposit backstop was confirmed.

The pattern, as of September 2026: fiat-backed coins have mean-reverted after every episode, while UST shows what an unreserved peg looks like when it breaks — the episode-by-episode account is in our guide to USDT depeg history and warning signs.

Why a depeg matters when you sell USDT

When you sell USDT at an OTC desk, the quote is the live market price minus the desk's spread — there is no official $1 rate to appeal to. Meridian publishes its spread, 0.08% to 0.40% by ticket size, on the main page pricing section.

During a depeg scare, three things happen at once: liquidity thins and spreads widen across the market, some counterparties requote or pause, and timing matters more because the price is moving. A desk that gives you one written, all-in price held for a defined window is worth more in stress than a marginally tighter quote that evaporates when you send.

A licensed desk also settles only to a bank account in your own name. In a stressed market that is a feature: the wire is documented, traceable and boring, exactly what your bank wants to see.

Worked example: a 2% discount on a 1,000,000 USDT ticket

A worked example shows the scale. Selling 1,000,000 USDT at a 0.25% spread, with the dirham at 3.6725:

What to watch before you settle

Before a large USDT sale, check where USDT actually trades against dollars on liquid pairs — not the number on a wallet screen. A wallet shows $1.00 by assumption; the market is the truth.

• Price vs $1 on liquid USDT/USD and USDT/USDC pairs — depth matters more than the last print.
• Issuer attestations — Tether publishes reserve reports on its transparency page; read the latest before size.
• Quote behaviour — ask whether the desk's written quote stays firm for a defined window during volatility.
• Account readiness — approval takes one business day in most cases, so finish the onboarding paperwork before you need the money.

In an active depeg, expect wider spreads and slower risk checks everywhere. If the exit route matters more than the last basis point, our checklist for cashing out crypto in Dubai legally covers the settlement side.

The bottom line

A depeg is a stablecoin failing to hold its target price — usually by fractions of a percent for minutes, occasionally by much more for weeks. For a large seller the discount is real money: on a seven-figure ticket even 1% dwarfs any desk's spread. Keep an approved account, insist on a written quote, and treat a deep discount as a pricing event, not a panic signal.

This guide is informational and is not legal, tax or investment advice, nor an invitation to buy or sell any virtual asset. Rules and figures are as of September 2026 — re-check the sources before acting. Virtual assets may lose their value in full or in part and are subject to extreme volatility.