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03 — Crypto & Web3 · Core

Stablecoins & On-Chain Dollars

CTRT Learn · Core · 12 min read

Bitcoin and ether are volatile, which makes them awkward for everyday payments — no one wants their salary to drop 20% overnight. Stablecoins solve this by putting a stable currency, usually the dollar, onto the blockchain. They've quietly become the most-used product in all of crypto. This lesson explains how they work, the crucial differences in how they're backed, and why they matter well beyond crypto.

The problem they solve

Crypto's openness is powerful, but its volatility is a barrier to using it as money. If you want to trade, save, send, or get paid on-chain without gambling on price swings, you need something stable. Traditional dollars can't move on a blockchain. Stablecoins bridge the gap: a token that aims to always be worth one dollar (or euro, etc.), so you get crypto's speed, global reach, and programmability with fiat's price stability. They're how most value actually moves through the crypto economy.

What "on-chain dollars" unlock

A dollar on a blockchain behaves differently from one in a bank:

• Fast, global, cheap — send dollars anywhere in minutes, any time, often for cents, with no bank intermediary.
• Always on — no weekends, holidays, or banking hours.
• Programmable — they plug directly into smart contracts and DeFi (next course).
• Accessible — anyone with a phone can hold dollars, even without a bank account — significant in countries with unstable currencies or limited banking.

The crucial question: what backs it?

A stablecoin is only as trustworthy as whatever holds its value at one dollar. This is where they differ enormously, and where the risk lives:

• Fiat-backed — each token is backed by a real dollar (or safe equivalents like short-term government bonds) held in reserve. The dominant and generally safest model. The key risk: do the reserves genuinely exist, fully and accessibly? Transparency and audits are everything here.
• Crypto-backed — backed by a surplus of other crypto locked as collateral (over-collateralized to absorb volatility). Decentralized, but dependent on the collateral holding up.
• Algorithmic — backed by no real reserves, instead using code and incentives to maintain the peg. The most fragile model. Several have collapsed catastrophically — most infamously when one unravelled in 2022, erasing tens of billions in days.

The lesson is blunt: not all stablecoins are equally stable. Always know what stands behind the peg.

How a peg can break

A stablecoin is "pegged" to a dollar, but the peg is a promise, not a law of nature. It holds as long as people trust that each coin can be redeemed for its underlying value. If confidence cracks — reserves are doubted, redemptions are frozen, or an algorithmic mechanism fails — holders rush to sell, the price slips below a dollar (a depeg), and the rush can become self-fulfilling, exactly like a bank run from the Money lesson. Even reserve-backed coins can wobble briefly under stress. The strongest defence is transparent, high-quality, fully accessible reserves.

Why they matter beyond crypto

Stablecoins have grown into one of the most consequential developments in finance. They settle trillions of dollars in value, are becoming a meaningful holder of short-term government debt through their reserves, and offer dollar access to people worldwide. Regulators have taken notice, moving to bring them under formal rules — a sign they're being treated as real financial infrastructure, not a crypto curiosity. They may turn out to be the technology that brings the most people into digital finance.

The CTRT lens

Stablecoins are infrastructure: the rails on which on-chain markets run, and the unit most positions are measured in. Their growth, their reserve composition, and their regulatory path are all forces that shape the digital-asset landscape CTRT operates in. They also sharpen a theme picked up in the next courses — that transparency, sound backing, and trust are exactly the variables that separate durable money from fragile money, on-chain or off.

Key terms

• Stablecoin — a crypto token designed to hold a steady value, usually $1.
• Peg — the fixed value a stablecoin aims to maintain.
• Reserves — the assets backing a stablecoin's value.
• Depeg — when a stablecoin loses its intended value.
• Algorithmic stablecoin — one relying on code, not reserves — the riskiest kind.

Next course — DeFi: Lending, Exchanges & Yield →

CTRT Learn is general education, not financial, legal, or tax advice. Nothing here is a recommendation to buy or sell any asset. Digital assets are volatile and may result in total loss of capital. CTRT is operated by Centrente, part of the Trancent world.