Mailchain
Mailchain is a web3-native email protocol and SDK that enables end-to-end encrypted communication between blockchain wallet addresses and web3 identities across multiple chains.
At a Glance
Pricing
Public good quota of free messages for human users — anyone can send and receive secure, private web3 email at no cost.
Engagement
Available On
Listed Mar 2026
About Mailchain
Mailchain is a web3 communication protocol that lets developers add secure, end-to-end encrypted email to their applications using blockchain wallet addresses and web3 identities. It supports all EVM-compatible chains as well as major ecosystems like NEAR, Tezos, Solana, and name services such as ENS, Lens, and Unstoppable Domains. Users get a unified inbox that aggregates messages across all their wallets and identities, while developers can integrate messaging via a simple npm SDK. Mailchain is designed to be progressively decentralized, with message fees targeted below $0.005 for high-volume senders and a free quota for human users.
- Web3-Native SDK: Install
@mailchain/sdkvia npm and start sending encrypted messages from blockchain addresses in minutes — no private key exposure required. - Multichain Support: Compatible with all EVMs, NEAR, Tezos, Solana, Filecoin, and major name services (ENS, Lens, Unstoppable Domains, Tezos Domains, NEAR, Aurora, Avvy Domains).
- End-to-End Encryption: Messages are encrypted using recipient-specific keys; Mailchain, storage providers, and ISPs cannot read message content.
- Unified Inbox: Users can view and send messages across all their wallets and web3 identities from a single, intuitive inbox application.
- Key Abstraction: Messaging keys are derived separately from wallet private keys, maintaining privacy and security without exposing signing keys.
- Notifications & Activity Rollups: Enable apps to send event-based notifications and activity summaries directly to users' web3 inboxes.
- Direct Messaging: Support one-to-one and community messaging between any web3 identities across supported chains.
- Open-Source SDK: The
mailchain-sdk-jsrepository is publicly available on GitHub, with example projects to accelerate integration. - Decentralized Storage: Messages are encrypted and stored on distributed storage; only an encrypted delivery request is sent on-chain.
- Web3 Authentication: Supports web3-native login flows, enabling users to access apps securely using their blockchain identity.
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Pricing
Free Plan Available
Public good quota of free messages for human users — anyone can send and receive secure, private web3 email at no cost.
- Free message quota for human users
- End-to-end encrypted messaging
- Unified web3 inbox
- Multichain support
- Web3 identity addressing
High Volume
For high-volume senders such as apps and protocols sending event-based notifications and activity rollups. Message fees targeted below $0.005 per message.
- High-volume message sending
- Event-based notifications
- Activity rollups
- SDK integration
- Per-message fee below $0.005
Capabilities
Key Features
- End-to-end encrypted messaging
- Web3 identity addressing (wallet addresses, ENS, Lens, NEAR, etc.)
- Multichain support (EVM, Tezos, Solana, NEAR, Filecoin, etc.)
- Unified inbox across all wallets and identities
- Key abstraction (messaging keys separate from wallet keys)
- Event-based notifications
- Activity rollups
- One-to-one and community direct messaging
- Web3 authentication support
- Open-source SDK (TypeScript/JavaScript)
- Distributed encrypted message storage
- Secret Recovery Phrase-based account management
- Free message quota for human users
- Progressive decentralization roadmap