Power Bank covers network fees when your account holds none of the network's gas token. Keep it charged, and your transactions go through.
What Power Bank Is
Every blockchain charges its fee in one specific asset on that same network — ETH on Ethereum, TRX on TRON, SOL on Solana. Holding USDT on TRON with no TRX means you cannot sign the transfer at all, no matter how much USDT you hold.
Power Bank removes that dead end. You top it up in US dollars, and when a transaction needs gas you don't have, Bron sends the required token to your account and takes the cost out of Power Bank.
Bron adds the first $5 for you, which is enough for the first transactions on most networks.
How It Works
You top up Power Bank by card, or with crypto from your own accounts.
When you don't have enough of the required token, you use Power Bank to cover the network fee.
Bron sends the required token to your account, then deducts the cost.
Bron sends more than the one transaction needs, so the surplus stays in your account for your next transaction on that network.
⚠️ Using Power Bank means two network fees: one for Bron to send you the gas token, and one for the transaction you are making. If you already hold the network's gas token, paying with it directly is cheaper.
Where You'll See It
Power Bank appears at the moment a fee cannot be covered, in:
Transfer — single transfers only
Swap — both types of quote
Buy & Sell — when you sell crypto for fiat
In each of those places you'll see a Use Power Bank button once Bron detects that the account has no gas for the network you selected. Bulk transfers are the exception: they show the Power Bank indicator but cannot use it, so send those one at a time if Power Bank has to cover the fee.
Power Bank shows as a pill at the top of the Transfer, Swap and Buy & Sell panels. Clicking that pill opens the Power Bank panel, where you can top up and see your activity. You can also open it from global search by typing power bank or gas.
If you see neither the pill nor the button, your role does not include the Power Bank permission, Power Bank is not enabled for your workspace, or the network you selected is not supported. Ask a workspace owner.
How to Top Up With a Card
Open the Power Bank panel from the pill.
Click Top up Power Bank.
Choose Card.
Pick a preset amount — $10, $30, $50, $100 or $250 — or type your own.
Click Create payment link.
Click Pay to open the payment page and finish the payment there.
Card payments are handled by Stripe on their own hosted page, so you will leave the Bron platform to pay and return afterwards. That page stops accepting payment 35 minutes after you create the link; if the payment is still unconfirmed 45 minutes after you created it, the top-up is cancelled. Until then it counts towards your limits.
A card tops up Power Bank, but it cannot pay a network fee directly — fees always come out of Power Bank.
How to Top Up With Crypto
Open the Power Bank panel and click Top up Power Bank.
Choose Crypto.
In From, select the account you want to pay from.
In Pay with, select the token.
Enter the amount in US dollars.
Click Preview, check the summary, then click Confirm.
Sign the transaction in the Bron Desktop App.
The Pay with list is filtered for you: it shows only tokens you hold in that account and can still cover the network fee with, so anything you cannot pay with is hidden. That set is wider than the networks Bron delivers gas on, and includes BTC, ETH, TRX, SOL, BNB and the major USDT and USDC variants. Treat the list itself as authoritative.
Two things worth knowing before you sign. The fee quote refreshes every 15 seconds while the form is open, because network fees move. And the US dollar figure you enter is an estimate — Power Bank is credited with the value of the tokens when the transfer confirms, capped at the amount you entered, so a falling price during confirmation credits slightly less.
A crypto top-up is an ordinary on-chain transaction from your own account, so it needs a signature and it needs gas on the network you are paying from. If everything you hold is a token with no gas to move it, use a card instead — the token list offers Top up with card when nothing is eligible.
How to Use Power Bank for a Fee
Build your transaction as usual — Transfer, Swap or Buy & Sell.
When the network fee cannot be covered, click Use Power Bank.
Wait for the gas to arrive in your account. The panel shows the delivery in progress.
Continue with your transaction and sign it as usual.
Bron delivers several times what the single transaction needs — around five times the current fee, and more for a Swap, because a swap can involve several on-chain steps. That is deliberate: it saves you topping up again for every transaction on that network.
If Power Bank does not hold enough for a full delivery, Bron sends less rather than refusing — at the minimum, just enough for the transaction you are making, so there may be nothing left over. It refuses only when even that does not fit.
A delivery that takes more than five minutes shows a note that it is taking longer than usual, and the gas still arrives once the network confirms it. If it does not go through at all, the use is cancelled, the row shows as cancelled in your activity, the amount set aside comes back, and you can retry from the transaction you were building.
Supported Networks
Gas delivery works on Ethereum, Solana, TRON, Arbitrum One, Optimism, Base, Binance Smart Chain, HyperEVM and Robinhood Chain.
On other networks you still need to hold the network's own gas token. The table in Sending Crypto lists which token each network requires.
Power Bank also comes up on its own when a transaction cannot go ahead for lack of gas. In the desktop app, if a transaction you sign through dApp Connect would fail because the wallet holds no gas token, the request stays open and offers Power Bank instead of being rejected.
Limits
Limit | Value |
Added by Bron at the start | $5 per workspace |
Smallest top-up you can submit | $1 |
Largest top-up | $500 |
Most Power Bank can hold | $500, including top-ups still awaiting payment |
Total top-ups | $500 per rolling 30 days |
Uses | 30 per 24 hours, counted per workspace and per member |
The 30-day top-up window is rolling rather than calendar — it frees up gradually as older top-ups age out, instead of resetting on the 1st of the month. The use limit works differently: once you reach 30 uses, Power Bank is unavailable for a full 24 hours from that point, and the count applies both to you individually and to the workspace as a whole.
💡 $1 is only the smallest amount the form accepts, not an amount that will get you anywhere. What you actually need is the fee to deliver the gas plus the fee for your own transaction, which on a busy network is far higher — the panel shows you the figure.
What You Pay
You pay for the gas token Bron sends you — the US dollar value of the tokens themselves — plus the network fee Bron paid to send them, plus a 1% spread. There is no separate Power Bank service charge. Because Bron deliberately sends several times one transaction's fee, a single use costs more than a single fee, and the surplus gas is yours: it sits in your account and pays for your next transactions on that network.
When a delivery starts, Bron sets aside about 20% more than the expected cost, because fees can change while the transaction is confirming. The unused part is released as soon as the delivery settles, so the amount set aside at the start is normally a little higher than the amount finally deducted. If the real fee turns out higher than what was set aside, you still only pay what was set aside.
Activity and History
The Power Bank panel lists your top-ups and uses. Clicking any row opens the full transaction details, and the figure keeps refreshing until a top-up lands.
Power Bank activity also appears in the main Transactions list, where Power Bank is available as a filter.
Edge Cases
A top-up is refused — it would take you past $500 held or $500 within 30 days. A top-up still awaiting payment counts towards both until it expires, so an unpaid card link can block the next one.
One delivery at a time — you can only have one gas delivery in flight per account per network. Wait for the first to land before starting another.
A delivery that fails — in almost all cases nothing is deducted and the full amount set aside comes back. Rarely a use needs manual review and that amount stays held until it is resolved; contact support with the row from your Power Bank activity.
A top-up that expires — a crypto top-up left unconfirmed for 15 minutes, or a card payment left unpaid for 45 minutes, is cancelled and nothing is charged.
Your own transaction fails afterwards — the cost covers delivering the gas, so it stands on its own. The gas is in your account and can be used for your next attempt.
⚠️ Power Bank covers network fees only. It cannot be paid out, moved to another workspace, or converted back to crypto or fiat, so top up roughly what you expect to spend on fees.
Power Bank is currently available on the Bron web platform only.
If you have questions, contact our support team via messenger on the Bron platform or by email support@bron.org.