starchild-ai-agent/@2004/erc-8004

🪪 ERC-8004 Skill

Implementation of the ERC-8004 Trustless Agents standard — the Ethereum Foundation dAI team's on-chain Identity + Reputation + Validation layer for AI agents.

• Spec: https://eips.ethereum.org/EIPS/eip-8004
• Contracts: https://github.com/erc-8004/erc-8004-contracts
• This skill gives Starchild agents a portable, censorship-resistant on-chain identity and a public reputation track record that any other agent can query.

What's in this skill

| Layer | Status | |---|---| | Identity Registry (ERC-721 agent identity) | ✅ Full read + write | | Reputation Registry (feedback + summary) | ✅ Full read + write | | Validation Registry | ⏸ Skipped — official README marks it as under active TEE-community revision |

Tx broadcasting goes through the Starchild wallet skill backend (tools.wallet._wallet_request → POST /agent/transfer), so the agent's Privy wallet signs and gas is platform-sponsored when available.

Supported chains

Singleton deployments per chain (same address triple across testnets, separate triple across mainnets):

| Chain | chainId | Identity | Reputation | |---|---|---|---| | base-sepolia (default) | 84532 | 0x8004A818…BD9e | 0x8004B663…8713 | | base | 8453 | 0x8004A169…a432 | 0x8004BAa1…9b63 | | ethereum | 1 | same as base | same as base | | ethereum-sepolia | 11155111 | same as base-sepolia | same as base-sepolia |

Pass chain="base" etc. to any function. Default is base-sepolia.

Usage from scripts

from core.skill_tools import erc_8004

# 1. Register this agent
r = erc_8004.register_agent(
    name="Crypto Research Agent",
    description="On-chain analyst — funding rates, OI, social sentiment, on demand.",
    services=[
        {"name": "web", "endpoint": "https://my-agent.com/"},
        {"name": "A2A", "endpoint": "https://my-agent.com/.well-known/agent-card.json", "version": "0.3.0"},
    ],
    x402_support=True,
    supported_trust=["reputation"],
)
print(r["agent_id"], r["explorer_url"], r["nft_url"])

# 2. Discover other agents
others = erc_8004.discover_agents(limit=20, filter_tag="reputation")

# 3. Fetch one agent's full registration
agent = erc_8004.get_agent(agent_id=42)
print(agent["registration_file"]["name"])

# 4. Leave feedback (caller MUST NOT be the agent's owner)
erc_8004.give_feedback(
    agent_id=42,
    value=5,                # 5/5 stars
    tag1="rating",
    endpoint="https://my-agent.com/research",
    feedback_uri="ipfs://Qm.../review.json",
)

# 5. Aggregate reputation (auto-fetches all reviewers if not specified)
rep = erc_8004.get_reputation(agent_id=42)
print(rep["count"], rep["avg"])

# 6. Pull individual feedback entries
for f in erc_8004.list_feedback(agent_id=42):
    print(f["client_address"], f["human_value"], f["tag1"])

Key semantics & gotchas

• agentId is an ERC-721 tokenId, assigned incrementally per chain. Globally unique identifier: eip155:{chainId}:{identityRegistryAddress}:{agentId}.
• Registration file is the off-chain JSON pointed to by tokenURI. By default this skill encodes it as a data:application/json;base64,… URI — fully on-chain, no IPFS / HTTPS hosting required.
• Sybil mitigation: getSummary requires non-empty client_addresses. Pass the reviewer set you trust. get_reputation(...) defaults to "all reviewers ever" if you don't specify, which is convenient but not Sybil-resistant — pick a reviewer allowlist for high-stakes decisions.
• Owner cannot self-rate: the Reputation Registry reverts if msg.sender is the agent's owner or operator. Use a separate wallet for testing.
• Validation Registry skipped: official README marks it as still under revision with the TEE community. Will be added in a follow-up.

Gas + tx-hash resolution (read this before debugging "no tx_hash")

Calls go through wallet_transfer which uses platform gas sponsorship by default (verified working on Base Sepolia via Alchemy paymaster, ERC-4337 EntryPoint v0.7 at 0x0000000071727De22E5E9d8BAf0edAc6f37da032). Sponsored txs come back from the wallet backend as:

{"data": {"hash": "", "user_operation_hash": "0x…", "sponsorship_provider": "alchemy", ...}}

The skill resolves user_operation_hash → real tx_hash by scanning EntryPoint UserOperationEvent logs — not by polling a public bundler. This is critical: Alchemy / Pimlico / Stackup / Biconomy don't share bundler mempools, so a Pimlico eth_getUserOperationReceipt for an Alchemy-submitted op will return null forever. Log scan is bundler-agnostic. See _resolve_user_op_hash in _utils.py.

If you ever see No tx_hash in wallet response, it means the EntryPoint scan timed out (default 90s, scanning latest 500 blocks) — increase timeout= on send_contract_tx or widen lookback_blocks.

If gas sponsorship is unavailable on the chain you target, fund the agent wallet from the corresponding faucet first (Base Sepolia: coinbase / alchemy / quicknode).

Demo: end-to-end agent commerce

See output/eth-hk-demo/ for a full scripted demo combining this skill with:

• ERC-8183 (Agentic Commerce) for escrow + evaluator-attested completion
• x402 for HTTP-native USDC micropayments