Send 505 USDT. Blomo’s top-up fee is 1% of the amount you ask to have credited, so the amount to send is the amount you want multiplied by 1.01, and 500 × 1.01 is 505. You do not have to work this out by hand: you type 500 into the top-up screen and Blomo shows 505 as the figure to transfer. The network’s own fee is a separate matter, paid in the chain’s own coin, and the rest of this page is about the cases where it quietly eats into the 505.
The formula
amount to send = amount you want credited × 1.01| You want credited | You send |
|---|---|
| 50 USDT (the minimum) | 50.50 USDT |
| 100 USDT | 101 USDT |
| 250 USDT | 252.50 USDT |
| 500 USDT | 505 USDT |
| 1,000 USDT | 1,010 USDT |
The 1% is the same on every network Blomo accepts, and it is the only fee Blomo takes on a top-up. The current rate is always on the fees page, which is the copy that stays up to date.
If you go the other way and send a round number instead of the quoted one, the credit is what arrived divided by 1.01: send a flat 500 USDT and just over 495 lands.
Sending from your own wallet: 505 means 505
For USDT and USDC, the transfer fee is paid in the chain’s native coin — TRX on TRON, ETH on Ethereum and Arbitrum — and not out of the tokens themselves. A 505 USDT transfer from your own wallet arrives as 505 USDT, provided the wallet holds enough of the native coin to pay for the transaction.
What that side costs, measured on 13 September 2026 for a transfer to a fresh address of the kind Blomo issues:
| Network | Fee paid in | Cost of the transfer |
|---|---|---|
| TRON (TRC-20) | TRX | ~13.03 TRX, about $4.44 |
| Ethereum (ERC-20) | ETH | ~0.0000051 ETH, about $0.013 |
| Arbitrum (USDC) | ETH | ~0.0000013 ETH, about $0.003 |
| Bitcoin | BTC, out of the amount sent | a few hundred satoshis, under a dollar |
Sources, all read on 13 September 2026: TRON energy use from real USDT transfers in block 86,210,617 and the getEnergyFee parameter of 100 sun, via the public TronGrid API; Ethereum and Arbitrum gas from eth_estimateGas and eth_gasPrice against public nodes, cross-checked against Etherscan’s gas tracker; Bitcoin at the 1 sat/vB rate recommended by mempool.space; prices ETH $2,475.10, TRX $0.340683 and BTC $76,679 from CoinGecko. Ethereum and Arbitrum gas is a market price that changes by the minute — check it on the day rather than trusting a figure from an article.
Sending from an exchange: add the withdrawal fee
This is where the arithmetic usually goes wrong. An exchange takes its withdrawal fee out of the USDT, not out of a separate coin, so asking it to withdraw 505 USDT normally means less than 505 USDT leaves for Blomo.
Two ways to handle it, both reliable:
- Enter 505 plus the withdrawal fee the exchange displays, and check that the line labelled you will receive — or its equivalent — reads 505.
- Or work backwards from the receive figure directly, which is the only number that matters to Blomo.
Blomo has no relationship with any exchange, does not recommend one, and cannot see or refund what yours charges.
The margin for error is 1 USDT
You do not need the transfer to be exact to the cent. Blomo credits a top-up automatically as long as what arrives is no more than 1 USDT short of what the request asked for. Ask for 505 and 504.20 arrives, and it is credited. What lands on the balance is always the amount that actually arrived divided by 1.01, never the amount the request named, so a small shortfall shows up as a slightly smaller balance rather than as a failed top-up.
Beyond that tolerance the rules change:
- More than 1 USDT short goes to manual review instead of being credited automatically. It is not lost; it is a person looking at it rather than a rule.
- Below the 50 USDT minimum also goes to manual review, whatever the request said.
- More than expected is simply credited. Send 600 against a 505 request and Blomo credits the 600 minus the same 1%, rather than crediting 500 and keeping the difference.
Why the exact arithmetic only works with stablecoins
If you top up with BTC, ETH, TRX or BNB, Blomo converts your target into that coin at the price at the moment you open the request, and that is the amount it asks for. But the credit is calculated from the price when the transfer arrives, not when you asked.
Between those two moments the price moves. If it falls far enough that the arriving coins are worth more than 1 USDT less than the request expected, the top-up goes to manual review rather than crediting automatically — through no mistake of yours. The request itself is open for 20 minutes on most networks and 60 minutes on Bitcoin, so that is the window in which the price has to hold.
For arithmetic that comes out exactly, send USDT or USDC. A stablecoin is worth the same when it arrives as when you pressed send, so 505 sent is 500 credited.
Quick answers
How much do I send to get 500 USDT on my Blomo card? 505 USDT. Blomo’s fee is 1% of the amount credited, and the top-up screen shows the figure to send once you type 500.
What is the formula? Amount to send equals the amount you want credited multiplied by 1.01.
Does the network fee come out of my USDT? Not when you send from your own wallet — for TRC-20 and ERC-20 transfers the fee is paid in TRX or ETH separately, so 505 USDT sent is 505 USDT received. An exchange withdrawal fee does come out of the USDT.
What if slightly less arrives than the request asked for? A shortfall of up to 1 USDT is credited automatically, and you are told it came in short. More than that goes to manual review.
What if I send more than the request asked for? The full amount is credited, minus the same 1%.
Can I send a round 500 instead of 505? Yes. The credit is then 500 divided by 1.01, which is just over 495 USDT on the balance.
What is the smallest top-up Blomo credits? 50 USDT, which means sending 50.50 USDT to have 50 credited.
Read on
- Fees, in full — the 1% top-up fee, the 50 USDT minimum and every card’s own fees, kept current.
- TRC-20 or ERC-20: what a top-up costs — the same arithmetic for 100 USDT, with the network fees compared.
- How long does a top-up take? — confirmations and waiting times per network.
- Getting started — the whole path from an empty account to a card that pays.