What they have in common
Both are dollar stablecoins: one token is meant to be redeemable for one US dollar, each is backed by reserves held by the issuer, and both run on multiple blockchains. Together they represent well over 80% of all stablecoin value in circulation. For a Canadian buying, holding or paying with them, the day-to-day experience is nearly identical — the differences are in who issues them, how the reserves are held and disclosed, and where each one is most accepted.
USDC — Circle
Issued by Circle, a US company regulated as a money transmitter in US states and licensed in the EU under MiCA. Reserves are held in cash and short-dated US Treasuries in a segregated fund managed by BlackRock and custodied at BNY Mellon, with monthly attestations by a Big Four firm. Circle's EUR stablecoin, EURC, follows the same model. USDC is the default in North American and European business use, DeFi, and with payment companies — and the one most institutions are comfortable holding on a balance sheet.
USDT — Tether
Issued by Tether, registered in El Salvador and historically domiciled offshore. Reserves are mostly US Treasuries but also include bitcoin, gold and secured loans; disclosure is quarterly, via an accounting-firm attestation rather than an audit. USDT is by far the more traded of the two and dominates in Asia, Latin America, Africa and the Middle East — if your supplier in Vietnam or Nigeria asks for "dollars," they usually mean USDT on the Tron network, because it is cheap to move and everyone around them accepts it.
Side by side
| USDC | USDT | |
|---|---|---|
| Issuer | Circle (US) | Tether (El Salvador) |
| Reserve mix | Cash + short US Treasuries | Treasuries, plus BTC, gold, loans |
| Disclosure | Monthly attestation, Big Four | Quarterly attestation |
| Regulatory status | US state licences; EU MiCA | Not licensed in US/EU for retail |
| Where it dominates | US, Canada, Europe, institutions | Asia, LatAm, Africa, trading venues |
| Cheapest network | Base, Solana, Polygon | Tron, then Solana |
| Best for | Treasury, compliance-sensitive payments | Paying suppliers in emerging markets |
Which one to use
If you are holding dollars as a Canadian business — treasury, a float for payouts, hedging CAD — use USDC: cleaner reserves, better disclosure and the one your auditor will not question. If you are paying someone, use whatever they can actually spend: that is often USDT on Tron in Asia and Africa, USDC in the US and Europe. For euro exposure, EURC. TokenNest sells all three and lets you pick the network at checkout, so the choice is per payment, not per account. See Buy & sell stablecoins.
Common questions
Both have wobbled briefly. USDC traded at about $0.88 for a weekend in March 2023 when a reserve bank failed, then recovered fully. USDT has dipped to the low $0.90s in past stress events and recovered. Neither has failed to redeem at $1.00.
Pick the network your recipient or your wallet supports. Tron and Solana move USDT for cents; Base and Solana do the same for USDC; Ethereum mainnet is the most widely supported but costs several dollars per transfer. Sending on the wrong network loses the funds.
A stablecoin is property for CRA purposes. Buying USDC with CAD and later selling it back can produce a small capital gain or loss from the CAD/USD move; using it to pay a supplier is a disposition at fair market value. Keep the CAD value at each transaction — TokenNest statements show it.