What is a stablecoin? Why USDC is different from BTC

The problem stablecoins were trying to solve

Crypto has a usefulness problem. Bitcoin and Ethereum are great for some things (digital scarcity, programmable money, censorship resistance) but terrible for others (paying for things, sending payroll, holding value in the short term). If your salary arrived in Bitcoin, your rent would cost a different amount every month. If you tried to lend Bitcoin to a friend, you'd both spend the next year arguing about how much they owe you when they pay it back.

For crypto to be useful as money in everyday transactions, you need something that: 1. Behaves like the dollar (or another stable currency) in price 2. Lives on a blockchain (so it can be sent globally, instantly, 24/7, without a bank) 3. Can be moved with the same composability as other crypto

Stablecoins solve this. They're cryptocurrencies whose price is pegged to a stable reference, usually the U.S. dollar. One USDC is designed to always be worth one dollar. Same with USDT (Tether), DAI, RLUSD, and a growing list of others.

Once you understand this, you understand why stablecoins are huge. They give you all the benefits of crypto infrastructure (global, instant, programmable, available everywhere there's internet) without the volatility that makes Bitcoin impractical for normal transactions.

How they actually maintain the peg

The "stable" in stablecoin isn't magic. Different stablecoins use different mechanisms to maintain their dollar peg. The three main categories:

Fiat-collateralized stablecoins

These are stablecoins backed 1:1 by actual dollars (or dollar-equivalent assets like short-term U.S. Treasuries) held in reserve by a central issuer.

USDC (issued by Circle) is the cleanest example. For every USDC token in circulation, Circle holds one dollar's worth of cash and short-term Treasuries in regulated U.S. financial institutions. The reserves are audited monthly. If you hold USDC and want dollars, you can redeem them for actual dollars through Circle (if you're an institution) or through any major exchange like Coinbase.

USDT (Tether) is the largest stablecoin and works on similar principles, though its reserve composition and audit history has been more controversial than Circle's. Tether has settled multiple regulatory cases related to historical claims about its reserves.

The strength of fiat-collateralized stablecoins is simplicity. Money in equals tokens out. Tokens in equals money out. As long as the reserves are real and the issuer is trustworthy, the peg holds.

The weakness: you're trusting a central entity. If Circle gets hacked, sanctioned, or goes bankrupt, your USDC could lose value or become inaccessible. This is the "centralization" critique of fiat-backed stablecoins.

Crypto-collateralized stablecoins

These are stablecoins backed by other cryptocurrencies, with overcollateralization (more crypto held than the stablecoin value issued) to absorb price swings.

DAI is the main example. To create new DAI, you deposit Ethereum (or other approved crypto) into a smart contract as collateral, and the contract issues DAI based on a ratio (typically you need to lock up $150 of ETH to mint $100 of DAI). If the ETH price drops too far, the contract automatically liquidates your collateral to maintain the system's solvency.

The strength: no central issuer. No company can sanction you, freeze your tokens, or fail and take your stablecoin down with them. The system is entirely on-chain.

The weakness: complexity. Capital inefficiency (you need more collateral than tokens you create). Risk during extreme volatility events (if ETH crashes 50% in an hour, liquidations might not happen fast enough to preserve the peg).

Algorithmic stablecoins

These use code-based mechanisms to attempt to maintain a peg without direct collateral. They have a poor track record. The most famous example was TerraUSD (UST), which collapsed in May 2022 and erased $45 billion in value over a few days.

Most regulators now treat algorithmic stablecoins skeptically. For practical purposes, you probably don't need to think about this category unless you're doing serious DeFi research.

Why this matters for normal users

If you're new to crypto, here's why stablecoins are practical:

Faster, cheaper international transfers. Sending $1,000 from the U.S. to a freelancer in the Philippines through traditional banking takes 1-3 business days and costs $30-$60. Sending the same $1,000 as USDC takes a few minutes and costs less than a dollar. This is genuinely transformational for global commerce.

Holding cash on-chain. If you're active in DeFi or just want to keep some value in crypto without exposure to Bitcoin or Ethereum volatility, stablecoins let you hold dollar-denominated value on the blockchain. Many people convert profits to stablecoins during bear markets to stay in crypto without holding volatile assets.

Earning yield. Stablecoin yields are often higher than traditional savings account rates. As of 2026, you can earn between 4% and 8% APY on USDC through regulated platforms like Coinbase. Higher yields are available in DeFi, but with corresponding risk.

Access to financial services if your bank fails you. In countries with currency controls, hyperinflation, or political instability, stablecoins provide access to dollar-denominated savings that traditional banking can't offer. This is a significant chunk of stablecoin usage globally.

The regulatory situation in 2026

This is where things have shifted dramatically over the past two years. Stablecoins have moved from "crypto experiment" to "legitimate financial infrastructure" in the eyes of major regulators.

The U.S. passed the GENIUS Act in 2025, creating the first federal framework for stablecoin issuance. The Act requires stablecoin issuers to hold high-quality reserves, conduct regular audits, and operate under federal or state oversight. The result has been a flight to quality. USDC and other compliant stablecoins have grown significantly, while opaque or unaudited stablecoins face increasing pressure.

The CLARITY Act, which is currently advancing through Congress in 2026, provides the broader framework for U.S. crypto market structure. Stablecoins are a key piece of this conversation. (We covered the regulatory trajectory in detail in Volume 03 of Across the Digiverse if you want the deeper analysis.)

The market response: stablecoins are now used by major financial institutions for settlement, by payment companies for cross-border transactions, and by businesses for international payroll. JPMorgan launched its own stablecoin (MONY). BlackRock launched a tokenized money market fund (BUIDL) that operates as essentially an institutional-grade yield-bearing stablecoin. The category has matured.

USDC vs USDT: the practical choice

The two largest stablecoins are USDC and USDT. If you're going to hold any stablecoin, you'll probably hold one of these. Quick comparison:

USDC is issued by Circle, a U.S. company that is publicly traded under the ticker CRCL. Reserves are held in U.S. regulated institutions and audited monthly by a major accounting firm. Backed primarily by U.S. Treasuries and cash. Regulatory standing is strong. Coinbase uses USDC as its primary stablecoin.

USDT is issued by Tether, a more globally distributed company with a more complex history. Larger market cap ($150B+ vs USDC's $80B+). More widely used in non-U.S. markets and on offshore exchanges. Reserve composition has historically been less transparent, though it has improved significantly since 2021.

For U.S. users specifically: USDC is the cleaner choice. The regulatory situation is clearer, the audits are more frequent, and the U.S. legal framework around Circle's operations is more established. If you're holding stablecoins as a parking place for crypto value, USDC is the default recommendation.

How to actually use stablecoins

For practical purposes, here are the most common uses:

Buy crypto in stages. Convert dollars to USDC on Coinbase, then buy other crypto over time with the USDC. This avoids the multi-day ACH delays between deposit and purchase.

Park profits. When you sell crypto for a gain and want to stay out of the market temporarily, sell to USDC rather than withdrawing to your bank. Faster to redeploy when you're ready.

Send money internationally. If you need to send funds globally, USDC on a fast network like Solana or Polygon settles in seconds for cents. Much better than international wires.

Earn yield. Major exchanges and DeFi protocols offer interest on stablecoin holdings. Coinbase's USDC rewards rate is currently around 4-5%. DeFi protocols offer higher rates with higher risk.

Use as a stable medium of exchange. Some merchants and freelancers accept USDC directly. You can send USDC for goods and services without converting to dollars first.

What can go wrong

Stablecoins are generally safer than volatile crypto, but they're not risk-free:

The peg can break. Even fiat-collateralized stablecoins have briefly traded away from the dollar during extreme market stress. USDC dropped to 87 cents briefly in March 2023 during the Silicon Valley Bank collapse, when Circle had reserves at SVB. The peg recovered within days, but the moment showed that "stable" isn't guaranteed.

The issuer can fail. A stablecoin is only as good as the entity backing it. If Circle goes bankrupt or its reserves turn out to be misrepresented, USDC holders take losses.

Regulatory action. Stablecoin issuers can freeze tokens at specific addresses (this has happened, usually for sanctions compliance). If you're sent USDC from a sanctioned address, your tokens could be frozen.

Smart contract risk. If you hold stablecoins in DeFi protocols rather than just holding the tokens, you're exposed to smart contract bugs and protocol failures.

For most users holding modest amounts on a regulated exchange or major wallet, these risks are small. But they exist.