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
Explore projects built with Arkiv and winning ideathon ideas. Browse by use case, explore the original submissions, and find a starting point for your own build.
116projects
27prize winners
6events
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 116 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.