Block has switched Square’s eligible merchants (excluding New York) from opt-in to opt-out for native Bitcoin payments over the Lightning Network. Merchants can settle receipts in USD by default, opt to hold full Bitcoin receipts, or set a percentage of each Bitcoin payment to keep as BTC. Square also offers automatic Bitcoin conversion of card sales. Bitcoin payments carry zero processing fees through 2026 (then a 1% flat fee), integrate with existing Square hardware and POS, and the updated Terms of Service (revised March 16, 2026) confirms the rollout. With roughly four million merchants on Square, even modest adoption rates could add hundreds of thousands of businesses holding Bitcoin on their balance sheets.

The rollout is fact-based and confirmed by Square’s updated Terms of Service (Mar 16, 2026); payments are auto-enabled (opt-out) for eligible merchants, carry zero processing fees through 2026, integrate with existing POS hardware, and offer USD/BTC/percentage settlement options — changes that increase on‑ramps and the potential for corporate Bitcoin treasury adoption among ~4M merchants.