Loading a crypto card with Bitcoin or Ethereum works, but stablecoins are objectively better for the purpose. The reasons are financial, not ideological.
Price Certainty
1 USDT ≈ $1.00. When you load $100 using USDT, you get $100 on your card minus the loading fee. That's it. No exchange rate moving against you while the transaction confirms.
With ETH, the price can shift 1-3% in the 5-10 minutes between initiating a load and on-chain confirmation. On a volatile day, you might load what you thought was $500 and end up with $485.
Lower Transaction Costs
Stablecoin transfers on Layer 2 networks are cheap. Sending USDC on Base costs under $0.05 in gas. The same dollar amount in ETH on mainnet might cost $3-10 in gas depending on congestion.
There's also no exchange spread. Volatile assets require a conversion step with an embedded spread — typically 0.5-1% even on transparent platforms. Stablecoins skip this entirely.
Which Stablecoin to Use
USDT (Tether) The highest liquidity stablecoin. Available on every major chain. If you're already holding USDT, there's no reason to convert to anything else before loading.
USDC (Circle) Fully reserved and regularly audited. Backed by cash and short-term U.S. Treasuries. Slightly lower liquidity than USDT on some chains but the regulatory transparency appeals to many users.
DAI (MakerDAO) Decentralized and overcollateralized. No single entity can freeze your DAI. The trade-off is minor: a slightly more complex issuance mechanism and occasionally trading a fraction of a cent off its $1 peg.
Choosing the Right Chain
Gas fees vary dramatically by network. For stablecoin card loads:
- Base — Fees under $0.05, confirmations in ~2 seconds
- Arbitrum — Fees around $0.10, inherits Ethereum's security
- Polygon — Fees under $0.01, wide USDT/USDC support
- BNB Chain — Fees around $0.05, fast finality
Avoid Ethereum mainnet for amounts under $500. The gas cost as a percentage of your load becomes unreasonable.