For sending USDT, TRC-20 (TRON) is far cheaper and faster — roughly $0.10–$1.50 per transfer, confirming in about a minute — while ERC-20 (Ethereum) is the most universally supported but costs more, often $1–$10+ in gas depending on network congestion. If you just want to save money, use TRC-20. If your USDT already lives on Ethereum, ERC-20 is fine. Both work for funding a crypto card — just match the sending and receiving networks.
Here’s the practical breakdown.
First rule: match the network
USDT exists on several blockchains. The one mistake that loses funds is sending on one network to an address for another. Before you send, confirm the deposit address and the selected network are the same. When you fund a card with USDT, the app shows a separate address for each network — send TRC-20 to the TRC-20 address, ERC-20 to the ERC-20 address.
TRC-20 (TRON)
- Fees: ~$0.10–$1.50 per transfer.
- Speed: confirms in roughly 1–3 minutes.
- Support: extremely widely used for USDT — the default on most exchanges.
- Gas: paid in TRX; many exchanges cover it on withdrawal.
Choose TRC-20 when you want the lowest fees and fast, predictable transfers. For everyday top-ups, this is the one to use.
ERC-20 (Ethereum)
- Fees: ~$1–$10+ in ETH gas, and it spikes when Ethereum is busy.
- Speed: usually a few minutes, slower under congestion.
- Support: the original, most universally recognised USDT standard.
- Gas: you need ETH in the wallet to pay for the transfer.
Choose ERC-20 when your USDT is already on Ethereum and you’d rather not bridge it, or a counterparty only supports ERC-20.
Side by side
| TRC-20 (TRON) | ERC-20 (Ethereum) | |
|---|---|---|
| Typical fee | $0.10–$1.50 | $1–$10+ (gas) |
| Speed | ~1–3 min | few min, slower when busy |
| Support | Very wide | Universal / original |
| Gas token | TRX | ETH |
| Best for | Lowest fee | Funds already on Ethereum |
Which should you use to fund a Fizardus card?
Fizardus accepts USDT on both TRC-20 and ERC-20. For almost everyone, TRC-20 is the better choice — you’ll pay cents instead of dollars, and it confirms fast. Only reach for ERC-20 if your USDT is already sitting on Ethereum and moving it isn’t worth the hassle.
And USDT isn’t your only option: Fizardus also lets you top up directly with BTC, ETH, TRX, or TON. USDT is simply the most popular pick because a stablecoin keeps your card balance steady. For the full flow, see how to fund a card with USDT, and the big picture in the complete guide to virtual crypto cards.
FAQ
Is TRC-20 or ERC-20 cheaper? TRC-20, by a wide margin — usually cents versus dollars on Ethereum.
What if I send on the wrong network? Funds may be unrecoverable. Always match the sending network to the receiving address.
Do I need TRX or ETH to send? ERC-20 needs ETH for gas; on TRC-20, TRX gas is often covered by the exchange when withdrawing.
Which is better for a crypto card top-up? TRC-20 for the lowest cost. Use ERC-20 only if your USDT is already on Ethereum.