Lightning, on-chain Bitcoin or USDT: what to use for a small online purchase

For a purchase between $50 and $200, the fee you pay to move your money is small next to the price. What matters more is whether the payment arrives without fuss, how long you wait, and what you can do if something goes wrong. Lightning, on-chain Bitcoin and USDT each win on a different one of those.

We'll be upfront about our own setup: this store takes on-chain Bitcoin, not Lightning, plus USDT and USDC on several networks, Monero and a dozen other coins. That shapes the advice at the end, but the comparison itself applies anywhere.

On-chain Bitcoin

This is Bitcoin as it was first designed. Your wallet signs a transaction, it goes to the mempool, a miner puts it in a block.

Cost. You pay by size, in sats per virtual byte, not by amount. A $50 payment and a $5,000 payment cost the same. On 12 October 2026, mempool.space showed 1 sat/vB enough for the next block, so a normal one-input payment was about 140 sats. When blocks are full, rates of 20 to 50 sat/vB push the same payment into the thousands of sats.

Speed. One confirmation takes about 10 minutes on average, often 10 to 30 depending on your fee and luck. Before that, the shop sees your payment in the mempool within seconds.

Compatibility. Every Bitcoin wallet and every exchange can send on-chain. There's nothing to set up.

Privacy. Every on-chain payment is public and permanent. Anyone who links an address to you can follow its history. Using your own wallet and fresh addresses helps; withdrawing straight from a KYC exchange doesn't.

When it goes wrong. A low fee means waiting, which Replace-by-fee can fix. Sending to the wrong address can't be undone.

Lightning

Lightning is a network of payment channels built on top of Bitcoin. Payments hop between channels and settle in seconds, without waiting for a block.

Cost. Routing fees are usually a few sats, often less than one. For small payments, it's the cheapest way to move bitcoin.

Speed. Seconds. A Lightning payment either completes or fails. There's no pending state.

Compatibility. This is the weak point. You need a Lightning wallet with enough outbound capacity, such as Phoenix, Breez or Zeus, or an exchange that supports Lightning withdrawals. The merchant needs a Lightning node with enough inbound capacity to receive the payment. Larger amounts sometimes fail to find a route.

Privacy. Better than on-chain for the payment itself, because it isn't written to the blockchain. The receiving node does learn things about the payment, and custodial Lightning wallets see everything you do.

When it goes wrong. A Lightning invoice has an expiry, often 10 to 60 minutes. If it expires, you ask for a new one. Refunds are awkward: the merchant can't just send money back to where it came from, because Lightning payments have no return address. You have to give them a fresh invoice.

USDT

USDT is Tether's dollar token, issued on several blockchains. It's what most crypto buyers outside the Bitcoin world use to pay for things.

Cost. It depends entirely on the network. On BNB Smart Chain, Polygon or Solana, sending from your own wallet costs well under a cent. On TRON, still the most common network for USDT, it costs about $2 to $4.50 in TRX unless you hold staked energy. On Ethereum it's usually a few cents, more when the network is busy. Exchanges charge their own withdrawal fee on top, and that's often the biggest number.

Speed. About a minute on TRON, Polygon, BNB Smart Chain and Solana. Several minutes on Ethereum.

Price. One USDT is worth about one dollar, so the amount you send is the price. Nothing moves while you wait.

Privacy. USDT transfers are public on every chain. Tether can also freeze USDT at any address, which it does on request from law enforcement.

When it goes wrong. Sending on the wrong network is the classic mistake: a TRON USDT withdrawal sent to an Ethereum address, or the other way round, doesn't arrive where you meant it to. Some mistakes can be recovered, many can't.

Side by side for a $56 purchase

Why this store takes on-chain Bitcoin, not Lightning

We'd rather say it plainly than leave you to discover it at checkout: there's no Lightning option here today. Our payment page shows one bc1 address and one exact amount for each order, and we watch that address on-chain. It works with every wallet, refunds go to a normal address, and nobody's payment fails for lack of a route.

The how it works page shows what happens after you pay. If your sats are on Lightning, you have three choices. Some Lightning wallets, Phoenix among them, can pay a bc1 address directly by sending on-chain from your balance. That works here, because what arrives is an ordinary on-chain payment; just make sure the exact amount lands. Otherwise, move the sats on-chain with a swap first, or pay with a coin from the rest of your wallet. A wallet that can only pay Lightning invoices will refuse our address.

Which to use

• You hold bitcoin in your own wallet: pay on-chain. Pick a normal fee and broadcast inside the 30-minute price window. The Bitcoin guide shows each wallet.
• You hold bitcoin on an exchange: withdraw on the Bitcoin network, not BEP20, and add the exchange's withdrawal fee to the amount due.
• You want the amount fixed to the cent: use USDT or USDC on a cheap network. How to pay lists them.
• You only have Lightning: send on-chain from your Lightning wallet if it can, swap first, or use another coin.

Whichever you choose, the plan you buy, whether ChatGPT, Claude or Google AI Pro, arrives the same way: a person prepares it once your payment confirms, usually within a few hours, and a full refund applies if we miss 24 hours.

ChatGPT

OpenAI

starts at $56.10 fees included

Plus $20 · Pro $100 / $200 / $500per month · 1, 3, 6, 12 months

Longer plans save up to 30%

Accounts based in the US, UK, Canada, Australia or EU

Pick a plan for ChatGPT

Claude

Anthropic

starts at $56.10 fees included

Pro $20 · Max 5x $100 · Max 20x $200per month · 1, 3, 6, 12 months

Longer plans save up to 30%

Your Claude account, wherever you are

Pick a plan for Claude

Google AI Pro

Google · Gemini

starts at $56.07 fees included

AI Pro $19.99 · AI Ultra 5x $99.99 · AI Ultra 20x $199.99per month · 1, 3, 6, 12 months

Longer plans save up to 30%

Accounts based in the US, UK, Canada, Australia or EU

Pick a plan for Google AI Pro

Questions about payment methods

Can I pay this store over Lightning?

No. We take on-chain Bitcoin, USDT and USDC on several networks, Monero and a dozen other coins. Lightning isn't one of them right now.

Is on-chain Bitcoin too expensive for a small purchase?

Not usually. The fee depends on size, not amount, and when the mempool is quiet it's a few hundred sats. Check mempool.space before you send if the network looks busy.

Is USDT safer than Bitcoin for paying?

It's more predictable on price, not safer. Both are final once confirmed. USDT adds the risk of picking the wrong network and the fact that Tether can freeze addresses.

What does "BTC on BEP20" mean, and will it work?

It's a wrapped token on BNB Smart Chain that tracks bitcoin's price. It isn't bitcoin, and it won't arrive at a bc1 address. Always choose the Bitcoin network when you withdraw.

Sources

• mempool.space: recommended fees
• Lightning Network: BOLT 11 invoice protocol (invoice expiry)
• Tether: supported protocols and legal terms
• TRON: resource model, energy and bandwidth