What is BTC Lightning? A beginner’s guide to the Lightning Network

Starting May 7th 2026, Ndax is adding BTC Lightning as a beta network option for Bitcoin transfers. This gives users a faster way to move Bitcoin when the destination supports the Lightning Network. If you’ve ever waited on Bitcoin confirmation or paid higher fees during busy periods, Lightning is designed to help with exactly that: quick BTC transfers that often settle in seconds. 

At launch, BTC Lightning withdrawals on Ndax will have a minimum withdrawal amount of 0.00001 BTC and a temporary maximum withdrawal amount of 0.008 BTC per transaction until Travel Rule implementation is fully completed, which may take up to 2 months. BTC Lightning deposits will have a minimum deposit amount of 0.00001 BTC and a maximum deposit amount of 1 BTC. For the first 3 months after launch, BTC Lightning deposits and withdrawals will have zero fees. After that promotional period ends, BTC Lightning deposits will carry a 0.20% fee and BTC Lightning withdrawals will carry a fixed 0.10% fee.
 

“BTC Lightning” references using the Lightning Network (often called “Lightning” or “LN”) to send and receive Bitcoin. Lightning is a Layer 2 payment protocol built on top of Bitcoin. It routes payments through a network of payment channels instead of broadcasting every small transfer directly to the Bitcoin blockchain.

The Lightning Network is designed to make everyday-sized payments practical and secure. Frequent, smaller transfers can happen off-chain, while the Bitcoin blockchain still provides enforcement and final settlement when needed.

On-chain BTC transfers are recorded on the Bitcoin blockchain, meaning timing depends on block confirmations. During periods of network congestion, withdrawals may take more than 10 minutes. It isn’t unusual for transfers to take over an hour during extreme network congestion periods.

Lightning withdrawals work differently. Lightning payments use invoices (payment requests) and typically settle within seconds. This is because transfers route through existing payment channels rather than waiting for on-chain confirmations for each step.

Important: Lightning is not a different coin. It’s still BTC. The key difference is the transfer rail users choose.

Lightning payments can be very low cost, but they are not always free. At launch, BTC Lightning deposits and withdrawals on Ndax will be free for the first 3 months. After that promotional period ends, BTC Lightning deposits will carry a 0.2% fee and BTC Lightning withdrawals will carry a fixed 0.1% fee.

Users should understand the basic Ndax limits at launch: BTC Lightning withdrawals have a minimum withdrawal amount of 0.00001 BTC and a temporary maximum withdrawal amount of 0.008 BTC per transaction until Travel Rule implementation is fully completed, which may take up to 2 months. BTC Lightning deposits have a minimum deposit amount of 0.00001 BTC and a maximum deposit amount of 1 BTC. Ndax is launching BTC Lightning in beta.
 

To withdraw BTC using the Lightning Network, follow these steps:

1. In Ndax, choose Withdraw → Bitcoin (BTC).
2. Select the network Bitcoin Lightning (LN) (instead of Bitcoin on-chain).
3. Paste your Lightning invoice (often starts with lnbc…) into the destination field. Lightning invoices are standardized and are Bech32-encoded.
4. Enter the withdrawal amount (or confirm it matches your invoice).
5. Review the withdrawal details and confirm.
6. Complete any required security checks, such as 2FA.
7. The withdrawal should arrive in the receiving Lightning wallet once the payment routes successfully, often in seconds.

Important: Before withdrawing, users should know that Lightning does not work like a normal BTC address withdrawal. The receiving wallet or service must support Lightning and generate a valid Lightning invoice. In most cases, that invoice is single-use, may expire, and may require an exact withdrawal amount. A Lightning withdrawal can also fail if the receiving wallet cannot accept the payment or if the network cannot route it successfully at that time. 

Use Lightning when:

• Sending to a Lightning-enabled wallet or service.
• Speed (typically seconds) and potentially lower transfer costs are the priority.
• The amount fits within Lightning limits and routing liquidity.

Use on-chain Bitcoin when:

• Sending Bitcoin to a standard BTC address (e.g., bc1…)
• The amount may be too large for the receiving Lightning setup, or routing may be restrictive.
• The destination specifically requires an on-chain deposit address.

Bottom line: Lightning is a new beta BTC transfer option on Ndax that is best suited to Lightning-enabled destinations. But on-chain BTC still has an important role.
 

What is BTC Lightning?
BTC Lightning refers to sending Bitcoin using the Lightning Network, a Layer 2 payment-channel system designed for fast, low-cost BTC transfers.

What is the minimum BTC Lightning withdrawal on Ndax?
The minimum BTC Lightning withdrawal on Ndax is 0.00001 BTC.

What are the Ndax deposit limits and fees for BTC Lightning?
BTC Lightning deposits on Ndax have a minimum deposit amount of 0.00001 BTC and a maximum deposit amount of 1 BTC. For the first 3 months after launch, BTC Lightning deposits will be free. After that, a 0.2% deposit fee will apply.

What are the Ndax withdrawal limits and fees for BTC Lightning?
Ndax BTC Lightning withdrawals have a minimum withdrawal amount of 0.00001 BTC and a temporary maximum withdrawal amount of 0.008 BTC per transaction until Travel Rule implementation is fully completed, which may take up to 2 months. For the first 3 months after launch, BTC Lightning withdrawals on Ndax will be free. After that, a fixed 0.10% withdrawal fee will apply.

Is Lightning “real BTC”?
Yes. It’s still Bitcoin (BTC). Lightning refers to a transfer method that uses channels and invoices to move value off-chain. Bitcoin remains the underlying asset.

Are Lightning withdrawals cheaper than on-chain?
Often, but not guaranteed. For the first 3 months after launch, BTC Lightning deposits and withdrawals on Ndax will be free. After that, BTC Lightning deposits will carry a 0.20% fee and BTC Lightning withdrawals will carry a fixed 0.10% fee. Best practice is to confirm the final fee before finalising a transaction.

What do Lightning invoices look like?
Many start with lnbc… for Bitcoin mainnet. Some apps present the invoice as a QR code or as a lightning: URI.

Do Lightning withdrawals settle quickly?
Yes, often in seconds, but not always.

Why do some Lightning withdrawals fail?
Most common causes include expired invoices, insufficient receiving liquidity, Lightning address endpoint issues, or routing liquidity constraints.

What happens to the BTC after a failed withdrawal?
If a Lightning withdrawal fails, the transaction is typically cancelled and the BTC remains in the user’s Ndax account. Users should still review the final transaction status in their account before retrying.

Do Lightning withdrawals use a normal Bitcoin address?
No. In most cases, Lightning withdrawals require a Lightning invoice from the receiving wallet or platform, not a standard on-chain BTC address.