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You paste your on-chain address before you pay, because Swaptopia sends the payout as soon as your Lightning payment settles. A swap must leave at least 1,000 sats after fees and, on mainnet, carry at most 2,750,000 sats. You need:
  • A Lightning wallet app holding the amount you send, plus its own routing fee.
  • A fresh receive address from your on-chain wallet app.

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Start the swap

1

Flip the direction

Select the Swap direction button so Lightning sits under You send and Bitcoin under You receive.
2

Enter the amount

Enter the amount in sats under You send, or select a preset. To get a set amount on-chain instead, enter it under You receive. Either way, the quote is an estimate. Read the quote explains each fee line.
3

Paste your address

Paste a fresh receive address from your on-chain wallet app in the Bitcoin address field.
Reusing an address links your swaps on-chain.
4

Select Swap

Swaptopia opens the Pay this invoice stage with an invoice to pay.

The address goes in before the invoice appears. The quote already takes out the service fee and miner fee

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Pay the invoice

1

Scan or copy the invoice

Scan the QR code with your Lightning wallet app, or select Copy invoice.
2

Pay it with this page open

The invoice is good for about 48 hours. You can close the tab and come back later. Have the page open when you pay, since Swaptopia claims the payment from this tab. If you pay while the tab is closed, your Lightning wallet app gets the payment back after a few minutes.
Screenshot of the Pay this invoice stage, with the amount, the invoice QR code, the Copy invoice button, and the notice that the tab can be closed

The stage bar shows what follows your payment: Settling, then Sending on-chain

3

Keep the tab open until the receipt appears

The stage changes to Settling, then Sending on-chain. If you lose the tab during Settling, your payment has already arrived. Reopen the same page in the same browser as soon as you can, so Swaptopia can finish the swap.

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Read the receipt

The Sent on-chain screen closes the swap:
  • Amount: The sats sent to your address.
  • Fee paid: The service fee and miner fee of the on-chain payout, in place of the quote’s estimate.
  • Transaction: A link to the payout on mempool.space, where you can follow its confirmations.
Select Swap again to return to the swap screen.
Screenshot of the Sent on-chain screen, with the amount, the route line, the fee paid, the transaction link, and the Swap again button

The payout confirms on-chain like any bitcoin transaction