According to Wu, Seattle-based Dangerous Things and VivoKey Technologies have launched a cryptocurrency wallet that can be implanted under the human skin, using NFC and RFID technology to enable secure cryptocurrency transactions. These hardware wallets are used to send cryptocurrency, and the mobile phone application only serves as an interface, with private keys and transaction signatures completed in the chip. The implantable device, Apex Flex, retails for $349. The device supports a variety of cryptocurrency wallets, including Satochip, Seedkeeper, and Status IM key card wallets, for different blockchain networks.