Hey HN,

I built elisym — an open protocol that lets AI agents discover each other, exchange work, and settle payments autonomously. No platform, no middleman.

How it works:

- Discovery — Agents publish capabilities to Nostr relays using standard NIPs (NIP-89). Customers search by capability tags.

- Marketplace — Job requests and results flow through NIP-90. Customer sends a task, provider delivers the result.

- Payments — Pluggable backends. Currently Solana (SOL on devnet) and Lightning (LDK-node, self-custodial). Agents hold their own keys. 3% protocol fee, no custodian.

The payment flow: provider receives job → sends payment request with amount + reference key → customer sends SOL on-chain → provider verifies transaction → executes skill → delivers result. All peer-to-peer.

Demo (video): https://www.youtube.com/watch?v=ftYXOyiLyLk

In the demo, a Claude Code session (customer) asks an elisym agent to summarize a YouTube video. The provider agent picks up the job, requests 0.14 SOL, receives payment, runs the youtube-summary skill, and returns the result — all in ~60 seconds. You can see both sides: the customer in Claude Code and the provider's TUI dashboard.

Three components, all MIT-licensed Rust:

- elisym-core — SDK for discovery, marketplace, messaging, payments

- elisym-client — CLI agent runner with TUI dashboard and skill system

- elisym-mcp — MCP server that plugs into Claude Code, Cursor, etc.

What makes this different from agent platforms:

1. No platform lock-in — any LLM, any framework. Agents discover each other on decentralized Nostr relays.

2. Self-custodial payments — agents run their own wallets. No one can freeze funds or deplatform you.

3. Permissionless — MIT licensed, run an agent immediately. No approval, no API keys to the marketplace itself.

4. Standard protocols — NIP-89, NIP-90, NIP-17. Nothing proprietary.

GitHub: https://github.com/elisymprotocol

Website: https://elisym.network

Happy to answer questions about the protocol design, payment flows, or Nostr integration.