What Is a Stablecoin? USDT, USDC, and Why They’re Ideal for Everyday Spending

Last updated: May 8, 2026

A stablecoin is a cryptocurrency engineered to hold a fixed value, usually one US dollar per token, by being backed one-to-one by reserves. USDT and USDC are the two most widely used. Both are accepted on Genghis with no KYC and instant on-chain delivery across multiple networks.

What Is a Stablecoin, Exactly?

A stablecoin is a cryptocurrency designed to maintain a stable value relative to a reference asset — usually one US dollar. Unlike Bitcoin or Ether, whose prices can move 5–10% in a single day, a well-functioning stablecoin trades within fractions of a cent of its target. The token itself is a regular cryptocurrency that can be sent to any wallet on its supported networks; the difference is the engineering behind the price.

Stablecoins fall into three categories based on how they maintain the peg:

Fiat-backed stablecoins are issued by a company that holds an equivalent amount of cash, treasury bills, and other dollar-denominated assets in reserve. For every token in circulation, there is supposed to be one dollar of reserve backing it. USDT (Tether), USDC (USD Coin), and PYUSD (PayPal USD) are the major examples. This is the simplest and most widely used model — the token is redeemable for the underlying asset, which keeps the market price near par.

Crypto-backed stablecoins are over-collateralized by other cryptocurrencies. The flagship is DAI, issued by MakerDAO: users lock up ETH or other tokens worth more than the DAI they receive, and the system adjusts collateral ratios to keep the peg. The advantage is decentralization (no company holds reserves); the trade-off is more complex peg dynamics and exposure to the underlying collateral's volatility.

Algorithmic stablecoins attempt to maintain the peg through programmatic supply adjustments, often without significant collateral backing. The most notorious example is TerraUSD (UST), which lost its peg catastrophically in May 2022, wiping out around $40 billion in value within days. The category has not recovered from that event in mainstream usage.

For Web3 commerce — paying for gift cards, eSIM, game keys, or any everyday digital good — fiat-backed stablecoins like USDT and USDC dominate. They have the deepest liquidity, the broadest network coverage, and the most predictable behavior at checkout.

How Do Stablecoins Stay Pegged to the Dollar?

The peg mechanism for fiat-backed stablecoins works through a mint-and-redeem cycle.

When a buyer wants new USDT, they send USD to Tether. Tether mints an equivalent number of USDT tokens and sends them to the buyer's wallet. The dollar sits in Tether's reserves; the token now circulates on the blockchain. When a holder wants their dollars back, they send the USDT to Tether for redemption. Tether burns the tokens and wires the dollars back. The supply of tokens on-chain therefore matches (in theory) the dollar value of reserves at all times.

Because the issuer always stands ready to mint at $1.00 per token and redeem at $1.00 per token, arbitrageurs keep the open-market price tied to that level. If USDT trades at $0.99 on an exchange, an arbitrageur buys it cheap and redeems with Tether at $1.00, profiting from the spread and pushing the market price back up. The same arbitrage works in reverse when the price drifts above $1.00.

This mechanism explains why stablecoin prices typically fluctuate within fractions of a cent — say, $0.998 to $1.002 — even during high-volatility periods in the broader crypto market.

The system depends on two assumptions: the reserves are actually there, and redemptions can happen quickly enough to absorb selling pressure. When either assumption is questioned, the peg can wobble. Tether and Circle publish periodic reserve attestations or audits to address the first assumption; their depth of liquidity addresses the second.

USDT vs USDC — What's the Real Difference?

Both USDT and USDC are dollar-pegged, fiat-backed, and trade at near-perfect parity. The differences are in the issuer profile, the reserve composition, and the regulatory posture.

USDT is the older, larger stablecoin. Tether's reserves include a mix of cash, US Treasuries, secured loans, and other assets. Tether publishes quarterly attestations rather than full audits. The trade-off: USDT has by far the deepest liquidity (especially on Tron and BSC), making it the de-facto stablecoin in emerging-market crypto and remittance flows.

USDC is younger, smaller in market cap, but considered more institutionally aligned. Circle issues USDC under tighter US regulatory frameworks and provides monthly attestations of reserves, which are held primarily in short-duration US Treasuries and cash. USDC tends to be the default stablecoin for DeFi protocols, US-based exchanges, and corporate treasury operations.

For paying on Genghis, the practical difference is small: both are accepted, both are pegged to the dollar, and the choice usually comes down to which one the buyer already holds in their wallet and which network has the lowest gas fees at that moment.

Why Use Stablecoins for Everyday Crypto Spending?

Four reasons explain why stablecoins dominate Web3 commerce flows.

Volatility immunity. A 5% Bitcoin move in 24 hours is normal. Spending Bitcoin therefore introduces price risk: the BTC paid for a $50 gift card today might have been worth $48 yesterday. Stablecoins remove that variable. A $50 purchase costs 50 USDT or 50 USDC, give or take a few cents.

Tax efficiency. In jurisdictions that treat crypto as property (US, UK, most of Europe), spending cryptocurrency triggers a capital gains event. If the spent BTC has appreciated since acquisition, the gain is taxable. Stablecoins, by contrast, do not appreciate against the dollar by design — so spending USDT or USDC typically generates zero or near-zero capital gain. This reduces tax-reporting friction substantially. Tax treatment varies by jurisdiction; this is general guidance, not tax advice.

Predictable budgeting. A wallet holding 500 USDT today will hold 500 USDT next month. A wallet holding 0.005 BTC today might hold 0.005 BTC worth $200 next month — or $400, or $150. For everyday spending, the predictability matters more than the upside. The how do you spend cryptocurrency guide expands on the budgeting framing for repeat shoppers.

Network and merchant compatibility. Stablecoins are accepted by virtually every crypto merchant, every DeFi protocol, and every payment processor. USDT in particular has the deepest acceptance because of its first-mover advantage. The Bitcoin vs stablecoins shopping guide breaks down the trade-offs in more detail, including when holding Bitcoin and spending stablecoins is the smart combined strategy.

The combination of these four factors is why most Web3 spending — gift cards, subscriptions, eSIM, food delivery, travel — converges on stablecoins as the default settlement layer.

Other Stablecoins to Know

Beyond USDT and USDC, several other stablecoins are worth knowing about.

DAI (MakerDAO). A decentralized, crypto-backed stablecoin pegged to the dollar through over-collateralization. Users lock ETH, USDC, or other approved assets in MakerDAO's smart contracts and mint DAI against them. DAI is censorship-resistant in a way fiat-backed stablecoins are not, since no company holds reserves that could be seized or frozen. Used heavily in DeFi.

PYUSD (PayPal USD). Launched in 2023 by PayPal in partnership with Paxos. Backed by US dollar deposits, short-term Treasuries, and similar cash equivalents. PYUSD is interoperable with the broader stablecoin ecosystem and integrated into PayPal's consumer flows.

FDUSD (First Digital USD). A newer fiat-backed stablecoin issued by First Digital Trust in Hong Kong, gaining traction on Asian exchanges.

EURC (Circle Euro). Circle's euro-pegged stablecoin, used for euro-denominated transactions in DeFi and cross-border payments.

Brief note on de-pegging events. Stablecoins can lose their peg under stress. The most catastrophic case was TerraUSD (UST), an algorithmic stablecoin that collapsed to near zero in May 2022 after a coordinated selling pressure broke its supply mechanism. Fiat-backed stablecoins have also experienced brief de-pegs during banking stress events — USDC dropped to around $0.87 in March 2023 when Silicon Valley Bank, where a portion of Circle's reserves were held, failed. The peg was restored within 72 hours after Circle confirmed reserve access. These events illustrate that "stable" is engineered, not absolute. The major fiat-backed stablecoins have a strong track record of maintaining the peg, but the assumption is not riskless.

Which Stablecoins Does Genghis Accept?

Genghis accepts the major stablecoins across all the networks where they are issued.

USDT (Tether): supported on Ethereum (ERC-20), Tron (TRC-20), Solana, BNB Smart Chain (BEP-20), Polygon, and several other chains. The full list of networks is shown at checkout once USDT is selected as the payment token.

USDC (USD Coin): supported on Ethereum, Solana, Polygon, Avalanche, BNB Smart Chain, and Arbitrum. As with USDT, the network options appear at checkout.

Other stablecoins: DAI, EURC, BUSD (where still supported), and others are also accepted as part of the 300+ token catalog. Less common stablecoins are routed through the same payment processor that handles all crypto checkouts on Genghis.

The network choice matters more than the stablecoin choice for fee optimization. Sending USDT on Tron (TRC-20) typically costs less than $1 in network gas regardless of order size. Sending the same USDT on Ethereum (ERC-20) can cost $5–25 depending on chain congestion. For small purchases (under $30), this differential is significant; for larger orders, it is negligible.

The network selector at checkout shows the gas cost in real time so the buyer can compare options. For most everyday spending — eSIM products, smaller gift cards, app store top-ups — TRC-20 USDT is the practical default. For larger purchases or DeFi-aligned wallets, Polygon or Solana can offer the best balance of low fees and broad wallet support.

For users coming from Bitcoin-only flows, switching to a stablecoin for everyday spending is a common adjustment — Bitcoin remains the long-term store of value, while USDT or USDC carries the day-to-day transactional load. The hub at buy gift cards with crypto shows the full token landscape and lets the buyer compare network costs directly.

How to Pay with Stablecoins on Genghis

The payment flow is identical across all 300+ supported tokens, but a few stablecoin-specific notes are worth highlighting.

Step 1 — Choose the product. Browse the catalog (gift cards, game keys, eSIM, prepaid Visa/Mastercard, travel) and select the denomination.

Step 2 — Select the stablecoin and network. USDT and USDC are listed prominently among the payment options. After selecting the token, choose the network — TRC-20 for cheapest, ERC-20 for widest compatibility, Solana or Polygon for a low-fee EVM alternative.

Step 3 — Send the exact amount. Genghis displays a one-time payment address and the precise USDT (or USDC) amount required. Send the exact amount from the wallet — sending more triggers a refund process; sending less leaves the order pending until topped up. Network gas is paid by the buyer, separately from the order amount.

Step 4 — Wait for confirmation. Tron and Solana confirm within seconds. Ethereum at standard speed confirms within 1–3 minutes. Polygon and BNB Smart Chain confirm within 30 seconds. Once the network confirms, the digital code is delivered instantly to the email and on-screen on the order confirmation page. The full process is documented in how Genghis works.

Step 5 — Redeem. The code is delivered immediately and is ready to redeem on the brand's platform. No further action with Genghis is required.

There are no platform fees beyond the network gas the buyer pays directly to validators. The price displayed at checkout is the price paid; why buy gift cards with crypto covers the broader benefits of this no-fee model. For users wanting to pair stablecoin payments with the practical context of bank-account-friction avoidance, the spending USDT without bank account freeze guide goes deep on the use case.

Frequently Asked Questions

What is a stablecoin?

A stablecoin is a cryptocurrency engineered to maintain a stable value, almost always tied to one US dollar per token. Unlike Bitcoin or Ether, whose prices fluctuate freely with market demand, stablecoins are backed by reserves (cash and treasury bills, in the case of USDT and USDC) that anchor the token to a target value. The result is a digital dollar usable across blockchains.

How is USDT different from USDC?

USDT (Tether) is older, larger by market cap, and has deeper liquidity especially on Tron and emerging-market exchanges. USDC (Circle) is younger, more institutionally aligned, and publishes monthly reserve attestations versus Tether's quarterly. Both are dollar-pegged and accepted on Genghis. The practical difference at checkout is small — pick whichever one your wallet already holds, and choose the cheapest network.

Why use stablecoins for everyday crypto spending?

Three reasons: price stability (the value does not move 5% overnight like Bitcoin can), tax efficiency in jurisdictions that treat crypto as property (no capital gains event when the price matches purchase cost), and predictable budgeting. A wallet holding 500 USDT today will hold approximately 500 USDT next month, which makes everyday transactional use simpler than holding volatile assets.

Can stablecoins lose their peg?

Yes, under stress. Fiat-backed stablecoins have experienced brief de-pegs during banking events — USDC dropped to about $0.87 for a few days in March 2023 when Silicon Valley Bank, holding part of Circle's reserves, failed. The peg recovered within 72 hours. Algorithmic stablecoins like TerraUSD have collapsed permanently. Major fiat-backed stablecoins have a strong recovery track record, but the peg is engineered, not absolute.

Which stablecoins does Genghis accept?

USDT and USDC are the primary stablecoins, supported across Ethereum, Tron, Solana, BNB Smart Chain, Polygon, and other major networks. DAI, EURC, and several other stablecoins are also accepted as part of the 300+ token catalog. The network selector at checkout shows the gas cost for each option so the buyer can pick the cheapest path for the amount being sent.

Does Genghis charge a conversion fee for stablecoin payments?

No. Genghis does not charge platform fees, conversion fees, or markups on stablecoin payments. The price shown at checkout is the price paid. The only cost beyond the order amount is the network gas, which the buyer pays directly to the blockchain validators when broadcasting the transaction. Choosing a low-fee network like TRC-20 or Solana keeps gas under one dollar for most orders. Full process details are in how it works.

Are stablecoins safer than Bitcoin for shopping?

Safer in terms of price predictability, yes. A 50 USDT payment today will be worth approximately $50 tomorrow regardless of what the broader crypto market does. Bitcoin's price can move 5% in a day, which makes it less suitable for predictable purchasing. The trade-off: stablecoins carry issuer risk (the company holding the reserves), while Bitcoin carries only protocol and market risk.

About the author: this guide was written by Claudio Cuccovillo, founder of Genghis Ltd.

Last updated: May 8, 2026