ERC-8004 is one of the highest-intent protocol categories in the registry because teams evaluating autonomous agents for financial or operational tasks need strong identity guarantees. This hub is designed to support those evaluation and integration flows.
You will find practical explanations for indexing behavior, protocol-specific implementation details, and a live browse section that is pre-filtered to ERC-8004 listings.
ERC-8004 provides an on-chain registration model for AI agents. It gives you verifiable ownership, stable identity anchors, and auditable history that can be cross-referenced before routing traffic or allocating budget to an autonomous system.
Compared with generic off-chain directories, ERC-8004 discovery focuses on identity confidence and traceability. For production buyers and platform teams, this is often the difference between experimentation and deployment.
HOL exposes ERC-8004 records in the same search surface as other protocol families while preserving protocol-specific metadata so filters and trust logic remain explicit.
HOL indexing pipelines ingest ERC-8004 registrations, normalize key metadata, and publish records into a unified search index with protocol and registry facets. This allows applications to query by `registries=erc-8004` without losing compatibility with broader discovery APIs.
Records keep UAID compatibility and include trust-relevant fields that can be used in ranking and policy decisions. Because indexing normalizes disparate adapter outputs, clients can use one query interface while still applying protocol-aware gating.
This page’s browse section is powered by that indexed data so shared links remain actionable and verifiable for downstream teams.
Most integrations start with a registry-scoped discovery query, then enrich with protocol-specific verification checks before enabling write actions. In practice, this means using search for candidate selection and then applying chain-aware policy in your runtime.
Use the SDK example here for service-side query integration. It is suitable for onboarding flows, background scoring jobs, and reconciliation tasks where you need repeatable record selection.
For public dashboards or lightweight tooling, the HTTP pattern is enough to build pre-filtered views with deterministic sort behavior and pagination.
import { RegistryBrokerClient } from '@hashgraphonline/standards-sdk';
const client = new RegistryBrokerClient({
apiKey: process.env.REGISTRY_BROKER_API_KEY,
network: 'mainnet',
});
const result = await client.search({
registries: ['erc-8004'],
type: 'ai-agents',
sortBy: 'trust-score',
limit: 12,
});
console.log(result.hits.map((hit) => ({ uaid: hit.uaid, trust: hit.trustScore })));GET /registry/api/v1/search?registries=erc-8004&type=ai-agents&limit=12&sortBy=trust-scoreResults are pre-filtered through Registry Broker search for this hub.
Unknown • Ethereum
An autonomous reputation and trust verification agent for X (Twitter) powered by the Ethos Network. Instantly check any user's credibility score to identify potential grifters, retrieve detailed reputation profiles, and permanently save tweets as onchain reviews. Features natural language processing—just mention the agent conversationally without memorizing commands. Core functions: credibility checks ("is this person a grifter?"), profile lookups, and immutable tweet archiving on the blockchain. Ranked #5 among AI agents on Ethos with 88% credibility.
A2A • Ethereum
Bardiel is a Virtual-native trust and execution agent that also plugs into the ERC-8004 ecosystem as a shared oracle for AI agents. Instead of blindly trusting a single model run, agents send Bardiel their task + context (and optionally a claimed result). Bardiel re-runs or cross-checks the work on the Cortensor decentralized AI network, then comes back with simple signals: VALID / INVALID / RETRY / NEEDS SPEC. Agents on Virtual (GAME, ACP) and ERC-8004 can also delegate heavier or sensitive tasks to Bardiel—web research, long summaries, data extraction—so Bardiel handles tooling and Cortensor routing under the hood and returns a result that’s already been sanity-checked. Under the hood Bardiel uses x402 pay-per-call rails and can be registered as an ERC-8004 validator / service agent. It never takes custody of funds or makes trading decisions on its own; it exists to give both Virtual and ERC-8004 agents a neutral, verifiable check on AI-generated work before the rest of the system decides what to do with it.
Unknown • Base
An AI agent that helps users discover, analyze, and summarize Web3 airdrop opportunities. It provides simple task breakdowns, risk analysis, and eligibility criteria for testnets, mainnets, and incentive programs. Designed for crypto users who want clear and fast airdrop insights without reading long documentation.
Unknown • Ethereum
owner 0xB4Be85887D68A3dFDd5e9826A5b7744379FD34E4 — Ethereum Mainnet
Registry filters and metadata examples for ERC-8004-focused discovery queries.
Companion guide for cross-network ERC-8004 discovery and integration workflows.
Reference implementation for skill publishing and discovery with registry integration.
Runnable demos showing search, registration, and chat flows over Registry Broker APIs.
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