Reach any address
Write to any 0x… address or ENS name. If they have never used 0xInbox, the message waits — encrypted — until the day they connect.
Live on Robinhood Chain · chainId 4663
Your wallet has an inbox. Encrypted. No middleman.
0xInbox turns every EVM address into an end-to-end encrypted inbox. Message any 0x… or ENS name, attach ETH when words are not enough — even someone who has never heard of us finds your message waiting the day they connect.
No seed phrase · Recipients need nothing installed · MetaMask, Rabby, Coinbase Wallet
Short video
See 0xInbox in forty seconds
🔊 Narrated — press play for sound.
Messaging that speaks money
Encrypted end to end
Messages are sealed on your device and travel the XMTP network unreadable. No server — ours included — can open them.
Money in the message
Attach ETH on Robinhood Chain to any message. “thanks for the design 🙏” and 0.1 ETH, in one gesture.
No wallet? No jargon.
Sign in with email or Google and your 0xInbox address is created for you, invisibly. No seed phrase, nothing to install.
The $INBX token
Utility you hold, not rent
A plain ERC-20 on Robinhood Chain — one billion, minted once, no tax. Four utilities, all read straight from your balance.
Premium tiers
Hold $INBX, unlock features. No subscription — your tier is read live from your balance onchain.
Tips
Send $INBX inside any message — the social currency of the app, with its own bubble.
Pseudos by burn
Reserve name@0xinbox by burning $INBX. Shorter is rarer. A public counter shows total burned.
Staking
Stake $INBX to share app revenue, paid in ETH, with a 7-day unstake cooldown.
Free
0 INBX
- Everything in 0xInbox core
Silver
1.0K INBX
- Unlimited groups
- Attachments up to 25 MB
- 3 exclusive themes
Gold
10.0K INBX
- Verified ✓ profile badge
- Premium themes
- Custom reactions
Diamond
100.0K INBX
- Priority pseudo@0xinbox
- Early access to features
- 💎 badge
Under the hood
No custom crypto, no message servers of our own — 0xInbox is a thin, open client over protocols you can verify.
live
Robinhood Chain
Settlement layer
An Ethereum Layer 2 built on Arbitrum Orbit — fully EVM-compatible, gas paid in ETH. Every payment you attach settles here.
chainId 4663 · gas in ETH
phase 3
XMTP
Messaging rails
A decentralized messaging network with MLS end-to-end encryption. Messages wait on the network — encrypted — until the recipient connects. We never run a message server.
@xmtp/browser-sdk · MLS
live
Privy
Invisible onboarding
Email, Google or Apple sign-in provisions a self-custodial embedded wallet in the background. No seed phrase, no extension — just your 0xInbox address.
@privy-io/react-auth · embedded wallets
live
wagmi + viem
Typed EVM access
Wallet connections, balances, transactions and chain switching — strictly typed TypeScript, from MetaMask to Robinhood Wallet via WalletConnect.
wagmi v2 · viem
live
Next.js 16
The app itself
App Router, React Server Components, strict TypeScript and Tailwind CSS 4. Deploys anywhere Node runs — Vercel-ready.
next@16 · tailwindcss@4
phase 7
Web Push + PWA
Notifications
Installable app with push notifications for accepted contacts only. Our backend stores push subscriptions — and nothing else.
service worker · VAPID
No middleman, provably.
Flip any conversation to Ciphertext view and see exactly what the network sees: sealed bytes. Encryption keys live on your device — our backend only ever stores push subscriptions.
a94d8f2e c7b103fe 5d92ee71 0b44fa1c 9e07d2b8 631cc5aa f8e2194d…
Read the whitepaper →