Social & CommunityFeatured build
Ocean
Decentralized Notion-style workspace with pages, members, and revision history stored on Arkiv — invite by email, no gas required.
- Entity Expiration
- Queryability
- Verifiable Ownership
Ecosystem
See how other builders are using Arkiv in the wild. Real projects shipped at hackathons and challenges — browse by use case, see which Arkiv primitive each one proves, and replicate the ideas in your own build.
104projects
15prize winners
5events
11use cases
Where to start
Featured builds
Social & CommunityWinner — $4K Prize
MentorGraph
Wallet-owned p2p mentorship network: profiles, asks, offers, and session booking stored as Arkiv entities with expiry-aware UX.
- Entity Expiration
- Queryability
- Live Events
- Verifiable Ownership
AI Agents & MemoryFeatured build
Cortex
Darwinian memory for AI agents: observations start with a 1h expiry and earn longer life every time they influence a real decision.
- Entity Expiration
- Lifetime Extension
- Queryability
- Verifiable Ownership
- AI / MCP Tooling
- Live Events
Open challenges
Nobody built this yet
Gaps spotted across the 104 projects in this catalog. If you’re hunting for a hackathon idea — these are free real estate.
Shared Cross-App Schemas
Nine event platforms were built — but an event created in one can't appear in another or feed a shared attendance reputation. Define a common entity schema and make two apps interoperate.
Arkiv Triggers — Zapier for Expiring Data
A worker network that watches queries, reacts to entity expiration or state changes, executes actions, and writes signed receipts back to Arkiv.
Multi-Writer Collaborative State
Nobody has tackled CRDT-style merging on top of Arkiv's single-owner entities. Build conflict resolution for collaborative docs or shared game state.
Query-to-Dashboard Studio
Every project here writes entities in — nobody ships the read side. Point a panel at any Arkiv query and get a live, shareable dashboard: auto-refreshing charts, embeddable widgets, no custom indexer.
Pay-Per-Query Data Commons
Multi-owner data + micropayments: publishers earn whenever their records satisfy someone's query. The pieces exist in separate projects — nobody has combined them.
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Your project belongs here
Every build above started at a weekend hackathon. Bring your idea to the Arkiv builder community — get help, share what you ship, and land on this page.