Whispr

Whispr occupies an unusual corner of the chat-app world: it is a messenger with no conventional account system. Instead of registering with an email address or phone number, you connect a crypto wallet — any wallet, or an email-generated one — and that address becomes your identity. A single signature activates a private inbox, after which you can message any other registered wallet, spin up group conversations with as many participants as you like, and see new messages arrive live.

The feature set deliberately blends what you expect from a chat app with what only a wallet can do. You can send images, video, audio and documents up to 50 MB per file, all visible only to the people inside that conversation, with 1 GB of storage per user. Batch send lets you write a single message and deliver it to up to ten recipients with one signature, with each copy landing in its own thread. When money is involved, you can attach ETH or USDC to a message; the recipient claims it with a tap, and no gas is required to send or claim USDC.

Under the hood the app is powered by three smart contracts on Base — one holding profiles, conversations, messages, media and payments; a forwarder that verifies your wallet's signature; and a paymaster that covers gas for relayed messages. There is no Whispr server storing your conversations: the client reads and writes those contracts directly, and the addresses are published so you can inspect them yourself. Note that this product is a messaging service rather than an AI model, so descriptions of it as a fine-tuned chatbot no longer match what it does.