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Cryptocurrency & Blockchain

Stablecoins: How They Stay Pegged

Fiat Reserves, Crypto Collateral, and the Algorithmic Designs That Failed — A TLDR Primer

Cryptocurrency moves fast — and stablecoins are one of the most misunderstood corners of it. You've probably heard that they're "pegged to the dollar," but what does that actually mean? How does a digital token hold a $1 price when Bitcoin can drop 20% in a day? And what went wrong when Terra/Luna lost nearly everything in a week?

A concise primer with no filler. You'll learn exactly how fiat-backed stablecoins like USDT and USDC use reserve models and mint/redeem mechanics to stay near $1, why DAI's overcollateralization design can survive a crypto crash, and how algorithmic stablecoins tried — and famously failed — to hold a peg without any real collateral. The book walks through the UST death spiral step by step, explains real depeg events like USDC during the SVB bank collapse, and closes with where regulation is heading and why billions of dollars in remittances now flow through stablecoin rails.

This guide is written for high school and early college students encountering crypto economics for the first time, for economics or personal finance students who want a clear primer on how stablecoins work, and for anyone who watched the Terra Luna UST collapse play out and still isn't sure what happened. No prior blockchain knowledge required — every term is defined the first time it appears.

If you want to understand one of the most consequential financial innovations of the last decade without wading through whitepapers, pick this up.

What you'll learn
  • Explain what a stablecoin is and why crypto needs one
  • Distinguish fiat-backed, crypto-collateralized, and algorithmic designs
  • Describe the arbitrage mechanics that keep a peg in place
  • Analyze the failure of TerraUSD and what it revealed about algorithmic stablecoins
  • Evaluate the real risks: reserve quality, depegs, regulation, and counterparty trust
What's inside
  1. 1. What a Stablecoin Is and Why It Exists
    Defines stablecoins, explains the volatility problem they solve, and introduces the concept of a peg.
  2. 2. Fiat-Backed Stablecoins: USDT, USDC, and the Reserve Model
    Covers how centralized issuers like Tether and Circle hold dollar reserves to back each token and how mint/redeem keeps the price near $1.
  3. 3. Crypto-Collateralized Stablecoins: DAI and Overcollateralization
    Explains how MakerDAO's DAI uses locked crypto worth more than the stablecoins issued, with liquidation mechanics that defend the peg.
  4. 4. Algorithmic Stablecoins and the Terra/Luna Collapse
    Walks through the seigniorage and dual-token designs, then dissects UST's death spiral in May 2022.
  5. 5. How Pegs Break: Depegs, Bank Runs, and Reserve Risk
    Examines real depeg events (USDC during SVB, USDT in 2022) and the systemic risks even 'safe' stablecoins face.
  6. 6. Regulation, Use Cases, and What Comes Next
    Surveys how stablecoins are actually used (trading, remittances, dollar access abroad) and where regulation is heading.
Published by Solid State Press
Stablecoins: How They Stay Pegged cover
TLDR STUDY GUIDES

Stablecoins: How They Stay Pegged

Fiat Reserves, Crypto Collateral, and the Algorithmic Designs That Failed — A TLDR Primer
Solid State Press

Stablecoins: How They Stay Pegged

Fiat Reserves, Crypto Collateral, and the Algorithmic Designs That Failed — A TLDR Primer

Copyright © 2026 Solid State Press.

Published by Solid State Press.

All rights reserved. No part of this book may be reproduced or transmitted in any form without prior written permission, except for brief quotations in critical reviews and educational use.

Part of the TLDR Study Guides series.

Contents

  1. 1 What a Stablecoin Is and Why It Exists
  2. 2 Fiat-Backed Stablecoins: USDT, USDC, and the Reserve Model
  3. 3 Crypto-Collateralized Stablecoins: DAI and Overcollateralization
  4. 4 Algorithmic Stablecoins and the Terra/Luna Collapse
  5. 5 How Pegs Break: Depegs, Bank Runs, and Reserve Risk
  6. 6 Regulation, Use Cases, and What Comes Next
Chapter 1

What a Stablecoin Is and Why It Exists

Bitcoin's price dropped 37 percent in a single week in May 2021. Ethereum lost half its value in three months during 2022. If you have ever tried to use a currency that swings that violently, you already understand the core problem that stablecoins are designed to solve.

A stablecoin is a cryptocurrency whose value is designed to stay fixed at a specific target — almost always one US dollar. That target is called the peg. The coin's issuer or protocol uses some mechanism — held reserves, locked collateral, or algorithmic incentives — to keep the market price as close to $1.00 as possible, even as the broader crypto market moves. The next four sections of this book are about how those mechanisms work and, sometimes, how they fail. This section gives you the foundation: what the problem actually is, and why a dollar-like token sitting on a blockchain is useful enough that tens of billions of dollars flow through stablecoins every day.

The Volatility Problem

Volatility means the size and frequency of price swings. Bitcoin and Ethereum are volatile because their prices are set purely by supply and demand among speculators, investors, and traders with wildly different views about future value. There is no mechanism anchoring the price to anything in the physical economy.

That volatility is fine — even desirable — if you are holding crypto as a speculative asset. But it becomes a serious obstacle the moment you want to use crypto as money. Consider three everyday financial tasks: paying for something, sending money to a relative abroad, or earning yield by lending assets on a decentralized platform. All three require the unit you're transacting in to be stable enough that neither party loses or gains unexpectedly just from waiting a day.

Imagine agreeing to pay a freelancer 0.05 ETH for a logo, with ETH at $2,000 — so roughly $100. If ETH drops to $1,400 before the transaction settles, the freelancer gets $70 worth of purchasing power instead of $100. That is a 30 percent pay cut from price movement alone, not from any business decision either party made. Neither side can plan around that.

About This Book

If you are taking a personal finance or economics course that touches on digital assets, enrolled in a blockchain or fintech elective, or simply trying to make sense of crypto news for the first time, this guide was written for you. It also works for the curious adult — parent, tutor, or self-learner — who wants a clear, honest explanation of how stablecoins actually work without wading through whitepapers.

This is a cryptocurrency basics study guide written for high school and early college readers. It walks through how stablecoins maintain their dollar peg using fiat reserves, explains DAI overcollateralization in plain terms, breaks down the fiat-backed vs. algorithmic stablecoin difference, and covers the Terra Luna UST collapse in a way that finally makes the mechanism click. It also introduces the stablecoin regulation landscape students are increasingly tested on. Short by design, no filler.

Read straight through once for the big picture, pay close attention to the worked examples, then attempt the practice problems at the end to confirm you have it.

Keep reading

You've read the first half of Chapter 1. The complete book covers 6 chapters in roughly fifteen pages — readable in one sitting.

Coming soon to Amazon