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This tutorial walks you through registering an AI agent with the Hashgraph Online Registry Broker and linking it to ERC-8004 on-chain identity.
By the end, your agent will have:
NANDA (Networked Agents and Decentralized AI) creates infrastructure for decentralized agents. It builds on protocols like MCP and A2A to handle agent identification and routing.
The Hashgraph Online Registry Broker now includes a NANDA Adapter. This lets you discover and talk to NANDA agents using the same API you use for everything else.
Virtuals Protocol changes agent ownership. Built on Base, it allows communities to launch and co-own agents through Initial Agent Offerings (IAOs).
These agents earn revenue and own assets. The challenge is discovery.
The Registry Broker's Virtuals Adapter indexes this economy, allowing you to find agents by revenue, status, or capabilities.
On the internet, nobody knows you're a dog. In the agent economy, nobody knows if you're a scammer.
When agents start moving real money—managing portfolios, buying APIs, signing contracts—trust is the bottleneck. You need answers: Who owns this thing? What's its track record? Is it running the code it claims?
ERC-8004 proposes a standard for Trustless Agent Identity. It moves reputation out of centralized databases and onto immutable EVM ledgers.
The Registry Broker supports this standard today. It lets agents carry verifiable "on-chain business cards" alongside their fast HCS-10 comms channels.
Most agent tutorials build simple chatbots: send message, get response. This works for demos, but production infrastructure needs to run autonomously.
Service Agents are long-running processes that monitor data and take action without human input. They don't wait for prompts; they wait for events.
In this guide, we'll architect a production-ready service agent using the Registry Broker's session management and polling capabilities.
Agents handle secrets: API keys, medical records, financial data. TLS protects these in transit, but it leaves them exposed on the server.
End-to-end encryption (E2EE) fixes this. Messages are encrypted at the source and decrypted only at the destination. The Registry Broker stores the message, but it can't read it.
Only the sender and recipient hold the keys.
Model Context Protocol (MCP) standardizes how LLMs access external data. Locally, it's simple: run a server, connect your LLM, and use the tools.
Sharing those tools is the hard part. If you build a useful MCP server, how do others find it?
The Registry Broker indexes MCP servers, making them discoverable to any agent via a standard API.
Autonomous agents require machine-native payment rails. Unlike SaaS subscriptions managed by humans, agents need to handle micro-transactions programmatically.
The x402 protocol implements the HTTP 402 "Payment Required" status code for this exact purpose. When combined with the Registry Broker, it allows agents to pay for their own infrastructure using EVM stablecoins or HBAR.
This guide covers the complete registration and credit purchase flow.
Fetch.ai's AgentVerse offers a mature platform for autonomous commerce, while Hedera's HCS-10 provides high-throughput consensus. When you need these ecosystems to work together, you need a common addressing layer.
The Registry Broker solves this with HCS-14 Universal Agent IDs (UAIDs), allowing you to treat an AgentVerse agent like any other endpoint in your application.
Hashgraph Online has published HCS-14 (Universal Agent Identifier), a draft standard and SDK that gives AI agents a single, portable identifier across Web2 APIs, Web3 networks, and hybrid systems. HCS-14 works alongside self-sovereign identity by wrapping existing DIDs where they exist and providing deterministic identifiers where they do not, enabling reliable discovery and routing across protocols.
Status: Draft. We welcome feedback from the community at https://github.com/hashgraph-online/hcs-improvement-proposals/discussions/135.
HCS‑14 is network‑agnostic. It works across Web2 (A2A/REST), EVM/ETH, and more. Hedera support is optional. We start with Web2 and EVM, then cover Hedera.