Pay With USDT: Top Up OTPGmail Without a Bank Card

Updated October 2, 2026 · 6 min read

No international bank card? You can pay OTPGmail with USDT or USDC. Open Top up and choose Gateway 4 · USDT/USDC. Pick a coin and a network, enter the amount, and send exactly the amount shown to the deposit address. Your balance is credited automatically, usually in about 2 to 5 minutes, even if you close the page.

Short answer on cost: OTPGmail adds no top-up fee. You pay only the network fee charged by your wallet or exchange. The rate is shown on the page and locked when you create the top-up order, so you see what you will receive before you send. If you already use Binance, a Binance ID transfer (Gateway 5) is another option, with no fee and credit in about a minute.

What USDT and USDC are

USDT and USDC are stablecoins: crypto tokens designed to stay close to one US dollar each. They move on several blockchains, called networks. Examples are TRC20 (Tron), BEP20 (BNB Smart Chain), TON, ERC20 (Ethereum) and Solana. When you pay, both the coin and the network must match what the top-up page shows.

Where does USDT come from? Most people buy it in a crypto exchange app. Some buy it directly, and some buy it from other users in the app's P2P section, paying in local currency. Then they withdraw it to the deposit address. Rules on buying and holding crypto differ from country to country, and some countries restrict it. Check what applies where you live before you buy.

Coins and networks you can use

USDT works on many networks, including TRC20, BEP20, TON, ERC20, Solana, Arbitrum, Polygon, Optimism and Avalanche C-Chain.
USDC works on several, including BEP20, ERC20, Solana, Arbitrum and Polygon. There is no USDC on TRC20 or TON.

How to choose a network:

Pick one that your wallet or exchange supports for withdrawals.
Compare the withdrawal fee your exchange shows before you confirm. Fees differ a lot between networks.
Check the minimum. Each network shows its own minimum amount in the network list on the top-up page.

Step by step: top up with USDT

Sign in and open Top up from the menu. Under Crypto (stablecoins), choose Gateway 4 · USDT/USDC.
Choose a coin, USDT or USDC, and a network such as TRC20 or BEP20. Tap More networks to see the full list.
Enter the amount to top up. The page shows the minimum and maximum, what you send and what you receive.
Press Get USDT deposit address (or Get USDC deposit address).
On the payment page, copy the deposit address and the amount to send. Check the network and the locked rate. If a Memo / Tag field is marked Required, copy it too.
Send from your wallet or exchange on the same network. The address must receive exactly the amount shown, decimals included. Many exchanges take the withdrawal fee out of the amount you type, so add the fee if needed.
Wait on the page or close it. The status moves from Waiting for transfer to Confirming to Completed, and the funds appear in your balance.

The payment details stay valid for half an hour. If your transfer arrives late, within 24 hours, it is still credited automatically. If it is your first crypto payment, start with a small top-up to see how it works.

Paying with Binance ID instead

If you have a Binance account, choose Gateway 5 · Binance ID. You send USDT or USDC by Binance Pay, as an internal transfer to the Binance ID shown on the page. You must paste the exact Note shown on the page into the Note field. That note is how the payment is matched to you. There is no fee, and the balance is usually credited in about a minute.

Common mistakes and how to fix them

Wrong network or wrong coin. A transfer on the wrong network, or in the wrong coin, may be lost. Check both twice before you confirm. If it happened, contact support with the transaction hash.
Not the exact amount. Any other amount is not credited automatically. Contact support with your top-up reference and the transaction hash.
Missing memo or tag. On networks that need one, a missing or wrong memo means the payment is not credited automatically. Contact support with the reference and hash.
The order expired before you sent. Do not send again. Late payments within 24 hours are still credited, and you can enter the transaction ID on the page to check right away.
Same address, different networks. Addresses that start with 0x look the same on many networks. When you withdraw, pick the network the top-up page shows.
Still not credited. Send your top-up reference and the transaction hash through the Contact page. Support works during business hours, Vietnam time (GMT+7).

After your balance is credited

Your balance is kept in Vietnamese dong, and the English app shows a US dollar estimate next to prices. The balance never expires. It can be used only inside OTPGmail and is not paid out as cash. Refunds also go back to this balance, for example when a rental gets no code, or when a purchase delivers fewer accounts than you paid for.

You can spend it on:

Renting a Gmail or iCloud inbox to receive a verification code. Most services cost a few cents per inbox. If no code arrives within the waiting time (25 minutes at most), you get a 100% refund. See how Gmail rental pricing works and the Gmail rental overview.
Buying short-lived Gmail accounts that you can sign in to, for a fraction of a dollar each. See the buy Gmail accounts overview.

If you have a Vietnamese bank account, you can also top up by bank QR. That option works only with Vietnamese banks.

Ready? Open the app and choose Top up, or check the live price list first.

Frequently asked questions

Is there a fee to pay with USDT?

OTPGmail adds no top-up fee. You pay the network fee charged when you send, which depends on the network and your exchange. Binance ID transfers have no fee.

How long does a USDT top-up take?

Usually about 2 to 5 minutes after you send, depending on the network. Binance ID transfers usually take about a minute. You do not need to keep the page open.

What is the minimum amount?

The minimum is low. The exact minimum and maximum are shown on the top-up page, and some networks add their own minimum. Check both before you send.

Can I pay with USDC instead of USDT?

Yes. Choose USDC as the coin. It works on several networks, but not on TRC20 or TON.

Can I withdraw my balance back to USDT?

No. The balance can be used only inside OTPGmail and is not paid out as cash or crypto. In exceptional cases caused by a fault on our side, contact support.