What is Stablecoin?

A stablecoin is a cryptocurrency whose value is designed to track a stable reference asset, most commonly the US dollar at a 1:1 ratio. Popular stablecoins like USDC, USDT (Tether), and DAI are routinely priced at $1.00, even when Bitcoin and Ethereum are swinging by 10% in a day.

How stablecoins stay stable

Stablecoins maintain their peg through one of three mechanisms:

• Fiat-collateralized: The issuer holds real-world reserves (cash, short-term Treasuries) equal to the number of tokens in circulation. USDC and USDT work this way. Reserves are typically audited or attested to by third parties.
• Crypto-collateralized: The token is backed by other crypto assets held in on-chain smart contracts, typically over-collateralized to absorb price swings. DAI is the most prominent example.
• Algorithmic: The supply expands and contracts automatically in response to demand. This model has historically been the most fragile — the 2022 collapse of TerraUSD (UST) is the canonical cautionary tale.

For payments, fiat-collateralized stablecoins (especially USDC) are by far the most commonly used and accepted.

Why stablecoins matter for payments

Price volatility is the biggest obstacle to using crypto for everyday purchases. If a coffee costs $4 and you pay in Bitcoin, the merchant might receive $3.80 or $4.20 worth of BTC by the time the transaction confirms. Stablecoins eliminate that problem — a $4 payment in USDC is always $4 at confirmation.

This is why many merchants that accept “crypto payments” actually default to stablecoin settlement, even when they also accept Bitcoin or Ethereum. It removes the FX volatility risk that processors like BitPay and Coinbase Commerce would otherwise have to hedge.

Where to spend stablecoins

A growing number of merchants accept USDC and USDT directly, especially through payment processors like Coinbase Commerce. You can also load stablecoins onto most crypto debit cards, often without triggering a taxable sale.