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), BNB Chain (on the same address plus the BRC8004 BNB-team fork at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7), and Solana via the QuantuLabs 8004-solana port (deployed 2026-03-04, agent-registry program 8oo4dC4JvBLwy5tGgiH3WwK4B9PWxL9Z4XjA2jzkQMbQ). Arbitrum is NOT deployed as of 2026-09-01: the Arbitrum Foundation blog describes the standard as "still under review" and provides no contract address. The widely-circulated "15 chains including Polygon, Optimism, HyperEVM, Plasma, Ronin, Unichain, Ink, Celo, Sonic, and Worldchain" list did not reproduce at its cited source when we fetched it on 2026-09-01.

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Canonical live answer · 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 are re-verified at source, not from a search snippet.

Short answer: ERC-8004 is deployed and reachable on four chains today — Ethereum and Base (both on the CREATE2 IdentityRegistry at 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432), BNB Chain (on the same address plus the BRC8004 BNB-team fork at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7), and Solana via the QuantuLabs 8004-solana port (deployed 2026-03-04). Arbitrum is NOT deployed as of 2026-09-01: the Arbitrum Foundation blog describes the standard as “still under review” and provides no contract address. The widely-circulated “15 chains” list including Celo, HyperEVM, Ink, Optimism, Plasma, Polygon, Ronin, Sonic, Unichain, Worldchain did not reproduce at its cited source when we fetched it on 2026-09-01.

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 — 2,827 indexed after per-publisher dedup. /chains/ethereum
Base	Yes — `0x8004A169FB4a3325136EB29fA0ceB6D2e539a432` (same CREATE2 address)	`eth_getLogs` on the IdentityRegistry, full census.	Yes — 22,914 indexed after per-publisher dedup. /chains/base
BNB Chain	Yes — `0x8004A169FB4a3325136EB29fA0ceB6D2e539a432` plus the BRC8004 BNB-team fork at `0xfA09B3397fAC75424422C4D28b1729E3D4f659D7`	`eth_getLogs` on both registries via `erc8004_discovery.py --chain bnb`.	Scanned, not served. The served hubs are Base + Ethereum only per task 0215's all-Ethereum posture — BNB live rate at the time of the cut was too low to justify a served hub.
Solana (QuantuLabs port)	Yes — mainnet, deployed 2026-03-04. Agent-registry program: `8oo4dC4JvBLwy5tGgiH3WwK4B9PWxL9Z4XjA2jzkQMbQ`. Atom-engine program: `AToMw53aiPQ8j7iHVb4fGt6nzUNxUhcPc3tbPBZuzVVb`. Devnet also live with distinct program IDs.	Verified at source via github.com/QuantuLabs/8004-solana on 2026-09-01. The README claims no adoption count — a good sign; population-scale claims from other sources have not held up when we fetched them.	No. This is a known gap in our coverage. Indexing Solana would require a Solana RPC quota and a discovery loop distinct from the EVM `eth_getLogs` pattern our existing three chains use.
Arbitrum	No — not deployed as of 2026-09-01.	Verified at the Arbitrum Foundation blog on 2026-09-01: the post describes the standard as “still under review” and provides no contract address and no Arbiscan link. The upstream snippet asserting “live on Ethereum, Base, Polygon, Arbitrum” did not reproduce at source.	N/A — nothing to index.
Celo, HyperEVM, Ink, Optimism, Plasma, Polygon, Ronin, Sonic, Unichain, Worldchain	Unverified. Named in a widely-repeated “15 chains” list.	Cited source (payram.com) fetched on 2026-09-01: the page uses Arbitrum as a “potential deployment location” example only and does not list contract addresses for these chains. Claim did not reproduce at source. Recorded UNVERIFIED in the signpost-gap discussion and in `docs/evidence/0375-ecosystem-opportunity-scan.md` §5.	N/A — deployment not established.

Where the “15 chains” claim came from

The specific list — Ethereum, Optimism, Base, Arbitrum, HyperEVM, Plasma, Polygon, Ronin, Unichain, Ink, Celo, Solana, Sonic, BSC, Worldchain — circulates in secondary explainers and search snippets. On 2026-09-01 we fetched the cited primary sources and could not reproduce the claim:

payram.com § “What is ERC-8004?” The page uses Arbitrum as a hypothetical deployment example and does not enumerate 15 chains, list contract addresses, or claim deployment on the other chains in the snippet.
Arbitrum Foundation blog on ERC-8004. The post describes ERC-8004 as “still under review” on Arbitrum and does not link to a contract, a deployment tx, or an Arbiscan page. If the standard ships on Arbitrum in the future this page will update; today it does not.

This is a correction, not an accusation: snippets get republished, and a widely-quoted list stays quoted long after its source has been superseded. The point of this page is to give a single re-verified table anyone can cite instead.

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. BNB additionally carries a BNB-team fork, BRC8004, at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7; both are scanned by erc8004_discovery.py.

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 deployed). Verified by fetching the Arbitrum Foundation's own blog on ERC-8004 at blog.arbitrum.foundation on 2026-09-01. Absence of a contract address on the standards-team's own page is the strongest available evidence of not-yet-deployed.

Source-fetch record. Full URL list, fetch dates, and snippet-vs-source disagreements are recorded in docs/evidence/0375-ecosystem-opportunity-scan.md §2c and §5. Every unverified chain listed above is marked SNIPPET-ONLY — UNVERIFIED in that record.

ERC-8004 v2. No v2 of the specification exists today (verified 2026-08-31, re-verified 2026-09-01). The EIP remains at Draft status. Third-party claims of “richer on-chain reputation primitives in v2” are not sourced to the EIP repo.

Limitations

We do not index Solana. The QuantuLabs 8004-solana deployment is real and live on mainnet, but our indexer runs against EVM chains only (Ethereum, Base, BNB). Any per-chain agent count this page shows is the EVM-side count; the Solana population is outside our current coverage.
Absence of address is strong, but 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.
BNB served surface is intentionally narrow. BNB agents exist on the registry but the site's served hubs are Base + Ethereum only per task 0215. See the all-Ethereum posture note for the reasoning (BNB live rate was 0.15% at the time of the cut).
Per-publisher dedup cap in effect on the EVM chains. Displayed indexed counts are the deduplicated set (each publisher capped at 50 rows). Disclosing the cap is the point: undisclosed capping reads as undercounting; disclosed capping IS the differentiation.

Cite this answer

Scoped claim sentence. Scope: ERC-8004 IdentityRegistry deployment status verified at 2026-09-01 — Ethereum, Base, and BNB Chain deployments confirmed at 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432 (BNB also carries the BRC8004 fork at 0xfA09B3397fAC75424422C4D28b1729E3D4f659D7); Solana via QuantuLabs 8004-solana confirmed at https://github.com/QuantuLabs/8004-solana; Arbitrum confirmed not deployed at 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 “On-Chain 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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