0xSlots

Modular & Immutable Collective Ownership Slots — Perpetual onchain real estate powered by partial common ownership and Harberger tax. Any ERC-20.

Every slot has a price. Holders self-assess and pay continuous tax. Anyone can buy any slot at the posted price. Resources flow to whoever values them most.

How it works

1. Self-assessment — Slot holders set their own price
2. Continuous tax — Pay tax proportional to your assessed price, deducted linearly from a deposit
3. Always for sale — Anyone can force-buy at the posted price, instantly
4. No squatting — Holding costs money. Insolvent occupants get liquidated

Architecture

0xSlots/
├── apps/
│   ├── contracts/       # Foundry smart contracts (Solidity)
│   └── landing/         # Next.js frontend
├── packages/
│   ├── contracts/       # Published ABIs & addresses (@0xslots/contracts)
│   ├── sdk/             # Type-safe subgraph SDK (@0xslots/sdk)
│   └── subgraph/        # The Graph indexing

Monorepo: pnpm workspaces + Turborepo

Contracts

Contract	Purpose
Slot	Core primitive — ownership, pricing, deposits, tax, liquidation
SlotFactory	UUPS-upgradeable factory deploying Slots via Beacon proxy
BatchCollector	Collect tax from multiple slots in one transaction
MetadataModule	UUPS-upgradeable module storing metadata per slot
ISlotsModule	Interface for module hooks (onTransfer, onPriceUpdate, onRelease)

Slots are fully immutable once deployed. Configuration (tax rate, module, manager) is set at creation and optionally mutable by the manager. Modules hook into lifecycle events for extensibility.

Security: Audited by K Security (Feb 2026)

Frontend

Next.js 16 · React 19 · TailwindCSS 4 · wagmi 3 · viem 2 · RainbowKit · shadcn/ui

Feature	Description
Explorer	Tabbed dashboard — Recipients, Slots, Modules, Events
Create Slot	Multi-step stepper with ENS resolution, currency selection, module picker
Slot Detail	Tabbed view — Details, Activity, Manage. Buy section with deposit slider
EIP-5792	Atomic batching (approve + buy in one prompt) when wallet supports it
Profile	Slots as recipient & occupant for connected wallet
Toasts	Transaction success/error notifications via Sonner

NPM Packages

Package	Version	Description
@0xslots/contracts		Contract ABIs and addresses for use with viem
@0xslots/sdk		Type-safe SDK for querying subgraph data

Deployments

Base Sepolia (84532) — Testnet v3

Contract	Address
SlotFactory	0x57759A2094cbE24313B826b453d4e7760279f79D
BatchCollector	0xDE5B9A3ce6Cbca935E33221909fA261F4EfC4c84
MetadataModule	0x6c5A8A7f061bEd94b1b88CFAd4e1a1a8C5c4e527
Currency	USDC (0x036CbD53842c5426634e7929541eC2318f3dCF7e)

Arbitrum (42161)

Contract	Address
SlotsHub (proxy)	0x774776d0f693eB7718b67f7938541D5bbB5f92D0
MetadataModule	0xe96e9105994A8691338eaf0fDc50c02277949521
Currency	USND

Subgraphs

Network	Endpoint
Arbitrum	https://api.studio.thegraph.com/query/958/0-x-slots-arb/version/latest
Base Sepolia	https://api.studio.thegraph.com/query/958/0-x-slots-base-sepolia/version/latest

Development

# Install dependencies
pnpm install

# Run frontend
pnpm dev:landing

# Build everything
pnpm build

# Lint & format
pnpm check
pnpm format

Contracts (Foundry)

cd apps/contracts
forge build
forge test

Built with

Foundry · Solidity · OpenZeppelin · The Graph · Next.js · wagmi · viem · RainbowKit · TailwindCSS · Turborepo

Links

• Website
• GitHub

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by adcommune