Radar Chat launched Tuesday, introducing an app that combines end-to-end encrypted messaging with self-custodial Bitcoin payments via the Lightning Network. The app, developed by the team behind Cake Wallet, allows users to send Bitcoin via text messages without switching apps or copying wallet addresses. Radar Chat founder Vikrant Sharma stated the app addresses the disconnect between messaging and payments, noting that "the people we talk to and the people we pay are often the same people, yet messaging and payments still live in separate places." Available on iOS and Android, Radar uses Signal's open-source protocol for encrypted messaging while enabling users to maintain control of their private keys. The launch aims to integrate two functions that previously required separate applications.
Radar Chat Integrates Signal Protocol with Lightning Network Payments
Radar Chat uses Signal's open-source protocol for encrypted messaging and enables Bitcoin payments through the Lightning Network within private conversations. The company clarified that Radar is a separate entity from Cake Wallet. Sharma explained the decision to build on Signal's technology: "Rather than reinventing secure messaging from scratch, the team chose to build on one of the most trusted and widely respected privacy technologies available. Many Bitcoin and privacy-conscious users already rely on Signal, so Radar builds on a familiar foundation while adding something that has been missing: native Bitcoin payments inside conversations." Sharma confirmed that Radar was developed independently from Signal, stating "we deeply respect the work the Signal team has done and financially support the project, because we believe privacy-preserving communication is an important public good."
Radar Chat Differentiates from Centralized Payment Services
Sharma contrasted Radar Chat's approach with existing digital payment platforms. He stated that apps like PayPal, Cash App, and Venmo simplified digital payments but required users to trade control for convenience. "Apps like PayPal and Cash App made sending money easier, but they're centralized services," Sharma said. "They hold your money, they can freeze your account, and they see every transaction you make. Convenience came at the cost of control." Radar Chat's use of the Lightning Network positions the app as a self-custodial alternative where users control their Bitcoin through private keys.
Lightning Network Enables Transactions Up to $5,000
Radar Chat uses the Bitcoin Lightning Network, a layer-2 payment network designed to make transactions faster and cheaper than sending directly on Bitcoin's base layer. Sharma stated that Radar successfully tested payments up to $5,000, with transaction capacity determined by available Lightning Network liquidity rather than limits set by the app. "For most people, Radar is designed around everyday payments—buying lunch, splitting expenses, paying a friend back, or sending tips," Sharma said. "Those are exactly the types of transactions Lightning excels at because they're fast, inexpensive, and settle almost instantly." While Lightning is often associated with small transactions measured in satoshis—1/100,000,000 of a full Bitcoin—Sharma indicated the app is not limited to microtransactions.
Recovery Options Include Seed Phrase and Encrypted Backup
During setup, Radar Chat provides users with a recovery seed phrase to restore their Bitcoin on another device. Sharma stated that an encrypted backup tied to the user's Signal account provides an additional recovery option. This dual-recovery system allows users to regain access to their Bitcoin if they lose their device while maintaining the self-custodial nature of the app.
FAQ
What did Radar Chat launch on Tuesday?
Radar Chat launched an app on Tuesday that combines end-to-end encrypted messaging with self-custodial Bitcoin payments via the Lightning Network. The app allows users to send Bitcoin via text messages without switching apps or copying wallet addresses, and is available on iOS and Android.
How does Radar Chat differ from PayPal and Cash App?
Radar Chat founder Vikrant Sharma stated that apps like PayPal and Cash App are centralized services that hold users' money, can freeze accounts, and see every transaction. Radar Chat uses the Bitcoin Lightning Network to enable self-custodial payments where users control their private keys, allowing them to maintain control of their Bitcoin while making transactions.
