What Are Stablecoins? A Complete Guide for Merchants

Stablecoins are cryptocurrencies designed to maintain a constant value, usually pegged 1:1 to the US dollar. They combine the speed and global reach of blockchain with the price stability businesses need.

If you have ever looked at accepting Bitcoin or Ethereum as payment, you probably noticed a problem: a $100 payment could be worth $92 or $108 by the time it settles. That volatility is a dealbreaker for most businesses. Stablecoins solve this entirely. When a customer sends you 100 USDC, you receive exactly $100 worth of value. No price swings, no conversion risk, no surprises on your balance sheet.

Types of Stablecoins

Not all stablecoins work the same way. Understanding the different types helps you choose the right one for your business.

Fiat-Backed Stablecoins

These are the most common and most trusted. Each token is backed by real US dollars (or dollar-equivalent assets like Treasury bills) held in reserve by the issuing company. When you hold 1 USDC, Circle holds $1 in reserve. When you hold 1 USDT, Tether holds equivalent assets. This reserve backing is what keeps the price pegged at $1.00.

The two dominant fiat-backed stablecoins are USDT (Tether) and USDC (USD Coin). Together, they represent over $200 billion in market capitalization and handle more daily transaction volume than most traditional payment networks.

Algorithmic Stablecoins

Instead of dollar reserves, algorithmic stablecoins use smart contracts and token mechanics to maintain their peg. They expand or contract supply based on demand. While innovative, this model carries higher risk. The collapse of TerraUSD (UST) in 2022, which lost its peg and wiped out $40 billion in value, demonstrated the fragility of purely algorithmic designs. For business payments, fiat-backed stablecoins remain the safer and more reliable choice.

USDT vs USDC: Which Should Merchants Accept?

Both are pegged to the dollar and widely used, but they differ in meaningful ways.

USDT (Tether) is the largest stablecoin by market cap and trading volume. It is available on virtually every blockchain, including Ethereum, Polygon, Tron, Arbitrum, Optimism, BNB Chain, Avalanche, and Solana. Its dominance means most crypto users already hold USDT. However, Tether has faced scrutiny over the transparency of its reserves, though recent attestations show the company holds sufficient backing.

USDC (USD Coin) is issued by Circle and is generally considered the more regulated and transparent option. Circle publishes monthly reserve attestations from a Big Four accounting firm, and USDC reserves are held in cash and short-duration US Treasuries. USDC is available on Ethereum, Polygon, Solana, Arbitrum, Base, Optimism, and Avalanche. Many US-based businesses prefer USDC for its compliance posture.

The practical recommendation for merchants: accept both. With Zateway, you can accept USDT and USDC on multiple chains simultaneously, so you never turn away a customer based on which stablecoin they hold.

Which Blockchains Support Stablecoins?

Stablecoins are not limited to one blockchain. USDT and USDC are deployed across dozens of networks, but some are far more practical for payments than others. The key factors are transaction fees, confirmation speed, and adoption.

Polygon offers sub-cent fees and finality in about two minutes. Base, built on the OP Stack, provides similarly low fees with the security of Ethereum underneath. Solana confirms transactions in under a second with fees below $0.01. Arbitrum and Optimism are Ethereum Layer 2 rollups that keep fees under $0.10 while inheriting Ethereum's security. Ethereum mainnet remains the most liquid but carries higher fees, often $2 to $15 per transaction, making it less ideal for everyday payments.

Zateway supports all of these chains. When a customer checks out, they choose the chain that works best for them. The merchant receives funds on whichever chain their wallet is configured for. This multi-chain approach maximizes compatibility while keeping costs low.

Why Merchants Prefer Stablecoins Over Volatile Crypto

The core advantage is predictability. When a customer pays $500 in USDC for your product, you receive $500 minus the processing fee. There is no exchange rate risk, no need to convert to fiat immediately, and no exposure to the kind of drawdowns that Bitcoin and Ethereum regularly experience.

Beyond stability, stablecoins offer real operational benefits. Settlement is direct, not T+2 like credit card processors. There are no chargebacks, because blockchain transactions are irreversible. Fees are dramatically lower: Zateway charges 1% flat versus the 2.9% plus $0.30 that Stripe and PayPal charge. And because stablecoins work globally, you can accept payments from customers worldwide without the complexity of international banking.

For businesses doing cross-border commerce, freelancing platforms, SaaS companies, and e-commerce stores, stablecoins are no longer experimental. They are a practical, cost-effective payment rail that settles in seconds and works everywhere.