Which chains is ERC-8004 actually deployed on, and is it live on Arbitrum, Polygon, or Solana?

ERC-8004 is deployed and reachable on four chains today: Ethereum mainnet and Base (both on the CREATE2 IdentityRegistry at 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432), one further EVM chain that we do not cover (same address, plus a chain-team fork at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7), and Solana via the QuantuLabs 8004-solana port (deployed 2026-03-04, agent-registry program 8oo4dC4JvBLwy5tGgiH3WwK4B9PWxL9Z4XjA2jzkQMbQ). Arbitrum: not confirmed as of 2026-09-01. The Arbitrum Foundation blog describes the standard as "still under review" and gives no contract address. Other chains sometimes listed in explainers (Polygon, Optimism, HyperEVM, Plasma, Ronin, Unichain, Ink, Celo, Sonic and Worldchain) are unconfirmed as of 2026-09-01, so we do not list them as deployed.

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Deployment status · last verified 2026-09-01

Which chains is ERC-8004 actually deployed on?

Per-chain deployment table verified at 2026-09-01. Indexed counts refresh live on every visit; deployment facts come from the primary sources linked below.

Short answer: ERC-8004 is deployed and reachable on four chains today — Ethereum and Base (both on the CREATE2 IdentityRegistry at 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432), one further EVM chain we do not cover (on the same address plus a chain-team fork at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7), and Solana via the QuantuLabs 8004-solana port (deployed 2026-03-04). Arbitrum: not confirmed as of 2026-09-01. The Arbitrum Foundation blog describes the standard as “still under review” and gives no contract address. Other chains sometimes listed in explainers (Celo, HyperEVM, Ink, Optimism, Plasma, Polygon, Ronin, Sonic, Unichain, Worldchain) are unconfirmed as of 2026-09-01, so we do not list them as deployed.

Per-chain deployment table

Chain	Registry deployed?	How we verified	Do we index it?
Ethereum	Yes — `0x8004A169FB4a3325136EB29fA0ceB6D2e539a432`	`eth_getLogs` on the IdentityRegistry (`Transfer(from=0x0)`), full census.	Yes — 3,237 indexed after per-publisher dedup. /chains/ethereum
Base	Yes — `0x8004A169FB4a3325136EB29fA0ceB6D2e539a432` (same CREATE2 address)	`eth_getLogs` on the IdentityRegistry, full census.	Yes — 23,572 indexed after per-publisher dedup. /chains/base
Another EVM chain	Yes — `0x8004A169FB4a3325136EB29fA0ceB6D2e539a432` plus a chain-team fork at `0xfA09B3397fAC75424422C4D28b1729E3D4f659D7`	Registration events read directly from the chain on both registries.	Not covered. Our reports and API cover Base and Ethereum only.
Solana (QuantuLabs port)	Yes — mainnet, deployed 2026-03-04. Agent-registry program: `8oo4dC4JvBLwy5tGgiH3WwK4B9PWxL9Z4XjA2jzkQMbQ`. Atom-engine program: `AToMw53aiPQ8j7iHVb4fGt6nzUNxUhcPc3tbPBZuzVVb`. Devnet also live with distinct program IDs.	Confirmed from the project's public repository (github.com/QuantuLabs/8004-solana) on 2026-09-01.	No. Not in our agent index, which covers Base and Ethereum. For Solana raw counts, see our Solana registry census.
Arbitrum	Not confirmed as of 2026-09-01.	Checked the Arbitrum Foundation blog on 2026-09-01: the post describes the standard as “still under review” and gives no contract address. See our Arbitrum census on the data hub for later measurements.	N/A — nothing to index.
Celo, HyperEVM, Ink, Optimism, Plasma, Polygon, Ronin, Sonic, Unichain, Worldchain	Unconfirmed. Named in a widely repeated “15 chains” list; the cited page gives no contract addresses for these chains.	No contract addresses found for these chains as of 2026-09-01. See the signpost-gap discussion.	N/A — deployment not established.

Why some lists show more chains

Some secondary articles list 15 chains (Ethereum, Optimism, Base, Arbitrum, HyperEVM, Plasma, Polygon, Ronin, Unichain, Ink, Celo, Solana, Sonic, a further EVM chain, Worldchain). The pages they cite do not give contract addresses for most of these, so the table above lists only what we could confirm.

Method

Registry addresses. The ERC-8004 IdentityRegistry uses the same CREATE2 address on every EVM chain where it is deployed (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432). Presence on a chain is established by confirming that address is a deployed contract with Transfer(from=0x0) event history via eth_getLogs. The further EVM chain additionally carries a chain-team fork at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7. Registration events on both registries are read directly from the chain.

Solana (QuantuLabs 8004-solana). Not the same registry — Solana requires Solana-shaped program-derived-address (PDA) accounts rather than EVM contracts, so the QuantuLabs port is a distinct implementation of the ERC-8004 concept on Solana runtime. Verified at github.com/QuantuLabs/8004-solana: README publishes mainnet program IDs for agent-registry (8oo4dC4JvBLwy5tGgiH3WwK4B9PWxL9Z4XjA2jzkQMbQ) and atom-engine (AToMw53aiPQ8j7iHVb4fGt6nzUNxUhcPc3tbPBZuzVVb) and separate devnet program IDs, with a deployment date of 2026-03-04.

Arbitrum (not confirmed). Checked the Arbitrum Foundation's blog on ERC-8004 at blog.arbitrum.foundation on 2026-09-01. We confirm a deployment by finding the registry contract and its registration events on the chain itself.

Specification status. ERC-8004 is still a Draft EIP and no version 2 has been published (last checked 2026-09-01).

Limitations

Our agent index covers Base and Ethereum. The QuantuLabs 8004-solana deployment is real and live on mainnet, but its population is outside that index; see the Solana registry census for raw counts. Any per-chain agent count this page shows is for Base or Ethereum.
A missing address is not final evidence. A future deployment on Arbitrum, Polygon, or any other chain in the unverified row would flip that chain's status. This page carries the state as of the verification date; a chain graduating from “under review” to live is a re-check trigger.
Other EVM chains are not covered. Agents exist on the registry elsewhere, but our reports and API cover Base and Ethereum only. See the note on why.
Per-publisher dedup cap in effect on the EVM chains. Displayed indexed counts are the deduplicated set (each publisher capped at 50 rows), so they can sit below the raw registration count.

Cite this answer

Citable summary. Scope: ERC-8004 IdentityRegistry deployment status verified at 2026-09-01 — Ethereum, Base, and one further EVM chain we do not cover deployments confirmed at 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432 (that chain also carries a chain-team fork at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7); Solana via QuantuLabs 8004-solana confirmed at https://github.com/QuantuLabs/8004-solana; Arbitrum not confirmed (https://blog.arbitrum.foundation/ai-on-arbitrum-establishing-an-agent-registry-with-erc-8004-2/).

License. Answer prose and every rendered number published under CC BY 4.0 — free to reuse, including in commercial work, provided you attribute “Onchain Agent Intel” and link back to https://onchainagentintel.io/erc-8004-chain-deployment-status.

Machine-readable source. Per-chain indexed counts are a live projection of /v1/public/stats.

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