USDT and USDC are dollar-referenced stablecoins that can be used to fund Agora Cards. At the checkout, the choice normally does not change how the merchant experiences the payment. Before the top-up, however, the tokens differ by issuer, reserve disclosures, supported networks and the markets where they are available.
Neither token is the same as holding physical dollars. Each depends on an issuer’s reserves and redemption arrangements, and each can trade away from its target price. Their contracts also include administrative controls. The right comparison is therefore not “which is guaranteed?” but “which set of risks and transfer options fits this transaction?”
USDT
USDT is issued by Tether and exists on multiple blockchains. That broad distribution can make it convenient for users who already hold it, but network names alone are not enough: sending a token over an unsupported chain or to the wrong address can result in loss.
Tether states that its tokens are backed by reserves and publishes circulation and reserve information on its transparency page. Its supported-protocol documentation lists current and deprecated deployments. Consult those first-party pages rather than relying on an old list in an article.
USDC
USDC is issued by Circle. Circle says USDC is redeemable 1:1 for US dollars by eligible customers and publishes weekly reserve information plus monthly third-party assurance reports on its transparency page.
As with USDT, USDC is deployed on multiple networks. A token carrying the same ticker on another chain may be bridged or issued by a third party rather than native USDC. Confirm the exact asset, network and deposit instructions shown by the receiving service before transferring.
The practical comparison
| Question | USDT | USDC |
|---|---|---|
| Issuer | Tether | Circle |
| Value target | US dollar | US dollar |
| Reserve information | Tether transparency and reporting | Circle weekly disclosures and monthly assurance |
| On-chain privacy | Transfers visible on public ledgers | Transfers visible on public ledgers |
| Main operational risk | Wrong network, issuer/counterparty risk, price deviation | Wrong network, issuer/counterparty risk, price deviation |
| Agora use | Supported for card top-ups | Supported for card top-ups |
Market capitalization, exchange listings and network support change frequently, so static rankings become stale quickly. Current liquidity on the venue you actually use is more relevant than a global headline number.
Network choice often matters more
For a card top-up, compare:
- whether Agora currently accepts the exact token and network;
- the sending wallet’s network fee and withdrawal fee;
- the expected confirmation time;
- minimum deposit or top-up requirements; and
- whether the destination address and any memo or tag are correct.
Do not choose a network solely because it was cheapest in the past. Fees and congestion vary, and an unsupported transfer can cost far more than any fee saving. Use a small test transfer when the workflow or address is new.
Privacy and custody
Neither USDT nor USDC provides transaction privacy by default. Blockchain observers can inspect transfers, and a card transaction creates separate records within the payment system. Agora limits collection to information that is strictly necessary, but this does not make public-ledger activity anonymous.
Funds also change custody when loaded. Assets kept in your own wallet remain self-custodied; card funds are held by Agora’s licensed and regulated custodian partners. For that reason, a card is better treated as a spending balance than long-term storage. Our custody guide explains the boundary.
A simple decision rule
If you already hold a supported version of either token, avoiding an unnecessary swap may reduce cost and execution risk. If starting from fiat or another asset, compare first-party reserve disclosures, available networks, venue liquidity and total transfer cost. In both cases, verify current deposit instructions immediately before sending.