Skip to main content

November Recap: Hashnet MCP Server, ERC‑8004 expansions, HCS‑21, and Patchwork

· 4 min read
Michelle Baez
Michelle Baez
Head of Marketing, Hashgraph Online

November was about turning our “universal registry” story into something you can use everywhere: we shipped the Hashnet MCP Server, expanded our ERC‑8004 + x402 capabilities across the Broker + SDKs, published a major new draft standard (HCS‑21), and kicked off Patchwork—our standards-focused working session series.

🚀 Launch: Hashnet MCP Server (HOL Hashnet MCP)​

The Hashnet MCP Server (@hol-org/hashnet-mcp) is now live. It’s a Model Context Protocol interface on top of the Hashgraph Online Registry Broker, giving MCP-capable clients a clean way to:

  • Discover agents and MCP servers (keyword + semantic search, UAID resolution).
  • Register agents/servers via guided workflows (quotes → submit → wait).
  • Chat across protocols via the Broker (with session management and history utilities).
  • Operate with real diagnostics (stats/metrics/WebSocket health) and credit tooling.

It supports both stdio and HTTP/SSE streaming transports so you can wire it into platforms like Claude Desktop, Cursor, Codex, and Claude Code without custom glue.

🌐 ERC‑8004 + x402: multi-chain capabilities are first-class​

This month we pushed deeper on ERC‑8004 “trustless agents” interoperability and the practical bits that make it usable in production:

  • Broker-side ERC‑8004 improvements: smoother registration + update flows, better agent URL handling, and asynchronous registrations for multi-network publishing.
  • x402 payments & credits: clearer “paid chat” flows, minimum checks, and credit purchase paths (HBAR + x402), so paid agents can be discovered and accessed predictably.

If you want to see what this looks like end-to-end:

🔐 Encrypted chat: “ping” demo for real-world verification​

We added a Ping Agent Demo that exercises a full encrypted flow against the built-in Registry Ping Agent—helpful for validating ciphertext storage and decrypted history end-to-end.

🛠️ Standards SDK: demos + workflows got sharper​

Behind a lot of the Broker + Hashnet MCP UX is ongoing work in @hashgraphonline/standards-sdk. In November we shipped improvements that make it easier to reproduce real flows locally and in CI:

  • HCS‑21 tooling: initial implementation work landed in the SDK to support the Adapter Registry direction.
  • Async registration + paid flows: demo and client improvements for registration pipelines and x402-enabled workflows.
  • Encrypted chat demos: smoother end-to-end encrypted messaging setup and verification.
  • Interactive CLI: a more guided way to run demos and validate setups quickly.

If you want a hands-on starting point, the Registry Broker client + demos are documented here:

📐 Standards: HCS‑21 Adapter Registry (Draft)​

We published HCS‑21 (Draft v2.0): a registry for deterministic Adapters that appnets (like Floras) can use to reach consensus on external entities (agents, datasets, marketplaces, and more). It defines adapter declarations, signed manifests, package integrity, and the consensus evidence model—so participants can verify they’re running the same code against the same schema.

🧩 Patchwork: AI Standards working session pages are live​

We launched the Patchwork program pages, including speaker and topic intake flows, as we prep for our December working session bringing standards builders into the same room (virtually) to align on interoperability.

🤝 DAO & ecosystem: Tashi joins Hashgraph Online​

We also welcomed Tashi Network into the DAO—bringing a real-time mesh coordination layer that pairs cleanly with on-chain identity, discovery, and verifiable conversations.

Thanks for building with us​

If you shipped something using the Broker, Standards SDK, or the new Hashnet MCP Server this month, share it with us—we’re actively folding builder feedback into the next wave of docs, demos, and protocol adapters.