Saul Carlin

@smc

125 Following

214 Followers

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6/ Chat together using any of your linked identities, and the conversation lands in the same unified inbox.

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4/ Set your default identity to control how others see you, and choose a recovery identity to regain access if needed.

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5/ Message anyone by ENS, wallet address, or linked usernames. Ethereum, Solana, Bluesky—all in one app.

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3/ Make your inbox discoverable by linking identities like Ethereum and Solana wallets, Bluesky DIDs, Farcaster FIDs, or Basenames. Identity links are recorded on XMTP's L3 appchain for cryptographic verifiability.

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2/ Start instantly in any app with just a passkey—no phone or wallet required. Privately share your inbox with friends via QR.

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1/ XMTP's V3 update this week laid the foundation for truly chain-agnostic, peer-to-peer messaging. Here's what this could look like in action, courtesy of v0 and Tailwind. Demo: https://v0-xmtp-v3-wireframes.vercel.app/ Walkthrough:👇

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An app could totally build this. Separate XMTP inboxes for identities that need to be kept separate, merged into one inbox in the UI layer.

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It unlocks: • Passkey support • Cross-chain identity • Bring your own keys, wallets, and names Your inbox is truly yours — flexible, portable, and no longer chained to a single wallet.

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Your old V2 ETH address becomes just one linked identity in V3. Your inbox is now portable, extensible, and future-proof — no longer stuck to one chain or key. Bring your own identities and switch them anytime.

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In V3, your inbox has a new unique identifier: inboxId. ✅ Controlled by passkeys or wallets ✅ Links multiple identities (ETH, Solana, more) ✅ Resolves names from any linked identity

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XMTP V3 changes how identity works for messaging. In V2, your inbox was your wallet — tightly bound to a single ETH address. Yesterday's V3 update decoupled that. Here's what changed 👇

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✅ Smart wallet inboxes ✅ Cross-device syncing ✅ Sender authentication ✅ End-to-end encryption ✅ Custom message types ✅ Disappearing messages ✅ Post-compromise security ✅ Encrypted push notifications Sure I'm missing another 10. 😊

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Proud of the @xmtp team for shipping the biggest update yet to the XMTP V3 protocol across all mobile, web, and server-side SDKs. ✨ 30+✨ features hardened: ✅ DMs ✅ MLS ✅ Groups ✅ Consent ✅ Attachments ✅ Group names ✅ Group photos ✅ Read receipts ✅ Caching layer

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✅ Native bindings ✅ Message replies ✅ Forward secrecy ✅ Private blocklists ✅ Account recovery ✅ Group permissions ✅ Cross-app syncing ✅ Message reactions ✅ Group descriptions ✅ EVM wallet inboxes ✅ Message streaming ✅ Multi-wallet inboxes ✅ Transaction receipts

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Passkey inboxes make it so that, in theory, any ownable identity can use XMTP. All it needs is keys to sign with. Which kind of identity should XMTP support next?

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Yes—we validate passkeys using WebAuthn, with each passkey tied to a specific origin domain

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Agent Builders, we want to hear from you! What are you looking for from inbox apps? From @xmtp? Users, drop your RFA - request for agent 🤖 Here are my top 3 DeFi agents: 1/ Portfolio Manager agent - making DeFi as easy as sending a message w/ my favorite protocols @yearn, Cove, @moonwell, @morpho, @aerodrome & Aave 2/ Best yield agent - finds you the best yield using @vaultsfyi or something similar 3/ Copy trading agent - @interface 👀 this is right up your alley https://community.xmtp.org/t/agent-builders-whats-on-your-wishlist/890

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4/ AFK insurance for alpha groups Listens in the gc and makes trades based on what it hears Any group member can fund the agent and get a dividend Now it hurts less when you're offline

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5. XMTP publishes the message onchain for anyone to verify the link. You can also use XMTP with only a passkey. Or multiple passkeys, so you can access the same inbox from any app/device.

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3. You log into your inbox app with your XMTP ID and another identity you own (e.g. Solana wallet) 4. Both identities sign a message to prove ownership and agreement

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