Square enables Bitcoin Lightning payments for 4 million merchants by default. USDT goes live on Lightning Network and Kraken gets Fed access.
Square just flipped the switch on Bitcoin Lightning payments for 4 million merchants across the United States, making BTC the first cryptocurrency accepted by default at point of sale. Combined with USDT going live on Lightning and Kraken's Federal Reserve master account, March 2026 marks the month Bitcoin crossed from "store of value" into a functioning payment network.
On March 30, 2026, Block Inc. (formerly Square) enabled Bitcoin Lightning payments for eligible merchants by default. This is not an opt-in feature buried in settings. Every qualifying Square seller in the United States can now accept Bitcoin payments automatically, with incoming BTC converted to USD in real time.
The economics are designed to accelerate adoption. Square is waiving all processing fees on Bitcoin payments through the end of 2026, after which a flat 1% fee will apply. For context, traditional credit card processing fees typically range from 2.6% to 3.5%. Even after the promotional period ends, Bitcoin Lightning offers merchants a 60-70% reduction in payment processing costs.
Square's Lightning integration is not yet available in New York State or outside the United States. Merchants can opt out if they prefer not to accept Bitcoin.
The scale is significant. Square processes payments for roughly 4 million sellers ranging from food trucks and coffee shops to mid-size retailers. No other payment cryptocurrency has achieved anything close to this level of merchant distribution in the U.S. market.
On March 21, 2026, Tether confirmed that USDT is now live on Bitcoin's Lightning Network via Taproot Assets. This 14-month integration, which began at the Plan B Forum in El Salvador in January 2025, transforms Lightning from a Bitcoin-only rail into a multi-asset payment network.
Taproot Assets v0.7, released by Lightning Labs in December 2025, introduced reusable static addresses for stablecoins and auditable supply commitments. The Multi-RFQ Send feature splits large payments across multiple channels, achieving reliability comparable to standard BTC Lightning payments.
This matters because it removes the volatility objection. Merchants who hesitate to accept Bitcoin due to price swings can now accept USDT over the same Lightning infrastructure with sub-second settlement and near-zero fees. Lightning can now compete directly with Ethereum L2s and Solana for stablecoin payment use cases.
On March 4, 2026, Kraken Financial became the first digital asset bank in U.S. history to receive a Federal Reserve master account. This grants Kraken direct access to Fedwire, the interbank payment network that processes trillions of dollars in transfers daily.
The immediate practical benefit: Kraken can now settle payments directly without relying on intermediary correspondent banks, which have historically been reluctant to serve crypto companies. Deposits and withdrawals for institutional clients become faster and cheaper.
The long-term implications are broader. Direct Fed access creates a path toward atomic settlement between fiat and crypto. An institutional trader could eventually move dollars from a bank account to a Bitcoin position to a Lightning payment in a single integrated flow, with each leg settling in seconds rather than days.
Kraken's Fed account is a "skinny" account. It does not earn interest on reserves or provide access to the Fed's emergency lending facilities. The phased rollout focuses first on institutional client activity.
The Lightning Network's growth trajectory supports the case for Bitcoin as a payment network, not only a savings technology.
Monthly transaction volume crossed $1 billion for the first time in November 2025, reaching $1.17 billion across 5.22 million transactions. The average transaction size nearly doubled year-over-year to $223, signaling growing institutional and commercial usage beyond the micropayment use case that dominated Lightning's early years.
Network capacity hit an all-time high of 5,637 BTC in early 2026. The Breez and 1A1z Bitcoin Payments Report estimates Lightning now reaches over 650 million users through integrations with platforms like Coinbase, CashApp, Revolut, and Strike.
On January 28, 2026, institutional trading desk Secure Digital Markets (SDM) sent $1 million to Kraken over the Lightning Network. The payment settled in 0.43 seconds with minimal fees. This was the first publicly disclosed seven-figure Lightning payment, powered by Voltage's enterprise infrastructure.
SDM stated the pilot demonstrated Lightning's viability for internal treasury movements, large-value settlements, and transfers between trading venues. The traditional alternative, an on-chain Bitcoin transaction or a bank wire, would take anywhere from 10 minutes to several business days.
This milestone matters because it addresses a persistent criticism: that Lightning works for buying coffee but cannot handle institutional-scale payments. A $1 million settlement in under half a second demonstrates otherwise.
Major exchanges and fintech platforms are rapidly integrating Lightning, creating the on-ramps necessary for mainstream payment adoption.
Coinbase integrated Lightning via a partnership with Lightspark, the infrastructure company founded by David Marcus (formerly head of Meta's crypto operations). Coinbase reports weekly Lightning activity of approximately 26,000 receives and 18,000 sends, with transfer costs reduced by over 80% compared to on-chain transactions.
Revolut partnered with Lightspark in May 2025 to bring Lightning payments to UK and EEA users. Lightspark's Universal Money Address system enables email-like identifiers for Lightning payments, replacing the complex invoice strings that previously limited user adoption.
Strike, available in over 70 countries, continues to expand its "Send Globally" remittance feature across Africa, Latin America, and Southeast Asia. The company raised $80 million to scale merchant and consumer payments, with partnerships spanning Blackhawk, NCR, and Shopify for point-of-sale integration.
El Salvador's Bitcoin experiment, now approaching its fifth anniversary, provides the longest real-world dataset for Lightning Network payments at scale.
Approximately 80% of merchants in the country accept BTC via Lightning, with the transition from the government's Chivo wallet to community-developed alternatives like Blink improving the user experience. El Salvador's real GDP growth is projected at approximately 4%, with the IMF publicly praising the country's economic progress.
The remittance use case remains the strongest. El Salvador receives roughly $7 billion annually in remittances, representing about 24% of GDP. Bitcoin and Lightning reduce intermediary fees on these transfers, potentially returning hundreds of millions of dollars to Salvadoran families who previously lost 5-10% of each transfer to fees.
Lightning does not operate in a vacuum. XRP targets institutional cross-border payments for regulated financial institutions, while Stellar focuses on connecting domestic banking systems for retail remittances. SWIFT's blockchain framework now has over 50 banks signed up, with 25 expected to go live by June 2026.
Lightning's competitive advantage is threefold. First, it settles in Bitcoin, the most liquid and trusted cryptocurrency. Second, with USDT now live via Taproot Assets, it offers stablecoin payments alongside BTC. Third, Square's merchant integration gives Lightning more U.S. distribution than any competing payment network.
The BOLT 12 protocol upgrade further strengthens Lightning's position by introducing reusable payment codes for subscriptions, route blinding for privacy, and variable payment amounts without generating new invoices.
The regulatory environment for crypto payments has never been more favorable. The GENIUS Act, signed into law on July 18, 2025, establishes a federal framework for payment stablecoins. Stablecoins are explicitly classified as not securities, not commodities, and not deposits.
The SEC-CFTC joint guidance issued on March 17, 2026, further clarifies how federal securities laws apply to crypto assets. This "minimum effective dose" regulatory approach removes much of the legal uncertainty that previously discouraged merchants and payment processors from touching cryptocurrency.
For Lightning specifically, the combination of clear stablecoin regulation (GENIUS Act), confirmed staking legality, and institutional access to Fed payment rails creates conditions where major payment processors can integrate Bitcoin without regulatory risk.
The narrative around Bitcoin is shifting. For most of its existence, Bitcoin has been primarily a store of value, a digital asset you buy and hold. The events of March 2026 challenge that narrow framing.
When 4 million merchants can accept Bitcoin by default, when stablecoins settle over Bitcoin's Layer 2, when a crypto bank has direct Fed access, and when a $1 million payment settles in 0.43 seconds, the "Bitcoin is too slow for payments" argument no longer holds.
This does not mean Bitcoin replaces credit cards tomorrow. The Lightning Network's Gini coefficient of 0.97 shows significant capacity centralization, with a small number of well-capitalized nodes handling most routing. Transaction volume, while growing fast, represents a fraction of global payment flows.
But the infrastructure is now in place. The question is no longer whether Bitcoin can function as a payment network. It is how quickly adoption scales from here.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Cryptocurrency investments carry significant risk. Always conduct your own research and consult with a qualified financial advisor before making investment decisions.
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