BoltCard

Bolt Card is not a traditional company but rather an open-source project that provides the specifications and reference software for creating and using NFC cards for Bitcoin Lightning payments. The project's mission is to make spending Bitcoin as fast and convenient as using a standard contactless debit or credit card. It defines a protocol for communication between a card and a point-of-sale device, allowing users to tap-to-pay from their Lightning wallet. The technology was pioneered by developers at CoinCorner and has been adopted by various wallet providers and hardware manufacturers in the Bitcoin ecosystem.