Which chain has the most ERC-8004 agents?

By raw registry-mint count, Base leads at 88,500 mints, followed by Ethereum mainnet at 50,820 and Arbitrum One at 1,604. By distinct owners the same ordering holds: Base 29,289 unique minting addresses, Ethereum mainnet 11,352, Arbitrum One 1,000. On-Chain Agent Intel indexes Base + Ethereum today; Arbitrum is measured but not indexed.

How many ERC-8004 agents have on-chain reputation feedback?

On the ERC-8004 ReputationRegistry at 0x8004BAa17C55a88189AE136b182e5fdA19dE9b63, we measured 108 Arbitrum agents that have received at least one NewFeedback event, across 973 total events from 36 distinct clients (full-history scan, 2026-10-07). On Base, 29,128 agents have at least one feedback row across 277,710 total events (On-Chain Agent Intel index, live). Ethereum mainnet has 0 feedback events recorded on the ReputationRegistry as of this measurement. Separately, 44 Base agents have commerce-backed reputation — feedback rows tied to a real paid on-chain job under the commerce-backed predicate — which is the more honest trust signal.

What is the ERC-8004 IdentityRegistry contract address?

The ERC-8004 IdentityRegistry is deployed at the same CREATE2 address 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432 across every EVM chain where the standard is live, including Base, Ethereum mainnet, Arbitrum One, Optimism, Polygon, Avalanche, Celo, Gnosis, Linea, Mantle, Metis, Scroll, Soneium, Abstract, Taiko, and Goat Network. The companion ReputationRegistry is at 0x8004BAa17C55a88189AE136b182e5fdA19dE9b63.

How often is this ERC-8004 adoption stats page updated?

Numbers on this page are dated to the specific measurement run that produced them — not live-rendered. The 2026-09-17 census is a full rescan of the Base, Ethereum, and Arbitrum IdentityRegistry at a single block checkpoint on each chain. The 2026-10-07 Arbitrum census is a full-history rescan via public RPC with no Alchemy credits. We refresh the compilation when a new dated cohort read is published. For live totals on the Base + Ethereum cohort On-Chain Agent Intel maintains in its paid intel index, see https://api.onchainagentintel.io/v1/public/stats.

Published 2026-10-08 · CC BY 4.0 · Compilation of dated per-chain cohort reads

How many ERC-8004 agents are there? Per-chain adoption stats

Q: How many ERC-8004 agents are there?

Across the three EVM chains with public ERC-8004 IdentityRegistry deployments we measured, 140,924 registry mints have been recorded as of the latest full rescan: Base 88,500 (2026-09-17), Ethereum mainnet 50,820 (2026-09-17), and Arbitrum One 1,604 (2026-10-07). A registry mint is a Transfer(from=0x0) event on the IdentityRegistry at 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432 — it is a count of registrations, not a count of agents that are currently live at their advertised endpoints. Solana adds a separate 1,477 registrations on an unrelated non-ERC on-chain registry measured 2026-09-02.

Every public ERC-8004 adoption number sitting in a news story, slide deck, or AI answer traces back to a scan of one of the on-chain IdentityRegistry contracts. The specific contract — same CREATE2 address 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432 across every EVM chain where ERC-8004 is live — is the one authoritative source. This page compiles the per-chain mint counts, distinct-owner counts, and on-chain reputation-feedback counts from two full-rescan datasets we have already published, and links the CSV / JSON behind each number. No estimates, no extrapolations, no 8004scan derivative counts.

Headline numbers as of 2026-09-17 (Base, Ethereum) and 2026-10-07 (Arbitrum One). Each number below is a named field in one of the two source datasets — links alongside.

Headline numbers — per-chain registry mints and owners

Chain	Registry mints	Distinct owners	Top-1 share	Top-10 share	As of
Base	88,500	29,289	11.58%	27.21%	2026-09-17
Ethereum mainnet	50,820	11,352	4.92%	18.25%	2026-09-17
Arbitrum One	1,604	1,000	17.02%	31.61%	2026-10-07

Source: all three rows are named fields in dataset.json (dataset page); the Arbitrum row is also carried in summary.json at the newer 2026-10-07 checkpoint (dataset page).

On-chain reputation feedback — agents receiving ERC-8004 NewFeedback events

The ERC-8004 ReputationRegistry at 0x8004BAa17C55a88189AE136b182e5fdA19dE9b63 is a separate contract from the IdentityRegistry. It receives a NewFeedback(agentId, clientAddress, scoreUri, ...) event every time a caller posts a reputation row for a registered agent. The contract is permissionless — any address can post feedback for any agent — so the row count is a signposting metric, not a Sybil-resistant trust score. See Can you trust an ERC-8004 reputation score? for the live-measured gap between the unfiltered feedback count and the commerce-backed subset.

Chain	Agents with ≥1 feedback row	Feedback events	Distinct clients	As of
Base	29,128	277,710	(not measured)	live
Arbitrum One	108	973	36	2026-10-07
Ethereum mainnet	0	0	0	live

Source: Base and Ethereum rows are the agents_with_reputation_by_chain and feedback_events_by_chain fields of the live /v1/public/stats endpoint (free, no key); Arbitrum row is the reputation_feedback block of summary.json. Of the Base cohort, 44 agents carry commerce-backed reputation under the predicate at smartcontractauditpro/commerce_backed.py — the full cohort is indexable at /commerce-backed-agents.

Metadata quality — how many registered agents publish a resolvable card

A registry mint is cheap. Publishing a resolvable tokenURI is slightly less cheap. Serving a live agent-card.json at the URL that tokenURI resolves to is work. The gap between those three is where almost all of the "ERC-8004 looks huge but nothing happens" criticism lives.

Chain	Non-empty tokenURI	% of registered	Notes
Ethereum mainnet	30,502	60.9%	of 50,071 registry mints at the 2026-08-17 snapshot
Arbitrum One (sample)	198 / 200	99.0%	evenly-spaced 200-of-1,604 sample; metadata resolves for 44 (22.0%)

Source: Ethereum row is ethereum_registry_non_empty_tokenuri / ethereum_registry_mints on /v1/public/stats; Arbitrum row is tokenuri_sample.with_token_uri / sample_n on the Arbitrum summary.json. Resolvable-metadata rate on Arbitrum is low because many agents publish ENS, .eth or .agent names rather than HTTPS URLs — a single-GET HTTP probe cannot resolve those. The stronger live signal on Arbitrum is the 108-agent reputation-feedback count in the table above.

Solana — separate registry, same question

ERC-8004 is an Ethereum standard, but a non-ERC on-chain agent registry exists on Solana. We measured it once alongside the EVM cohort for comparison. It is not part of the paid /v1/intel/* index.

Chain	Registrations	Distinct creators	Top-1 share	Top-10 share	As of
Solana	1,477	185	22.1%	78.7%	2026-09-02

Source: the solana_census block on /v1/public/stats; raw census snapshot at solana_8004_census.json.

Methodology

Base, Ethereum, Arbitrum (2026-09-17 census). Full rescan of the ERC-8004 IdentityRegistry at 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432, decoding Transfer(from=0x0, to=OWNER, tokenId) logs from the verified deploy block to a per-chain checkpoint around 2026-09-17T04:31Z. Registrations = decoded mint count; distinct owners = unique to addresses in the decoded logs. Full dataset: /data/erc-8004-four-chain-census-2026-09 (CSV + JSON + JSON-LD, CC BY 4.0).
Arbitrum One (2026-10-07 full-history census). Full rescan on arb1.arbitrum.io/rpc (fallback arbitrum.gateway.tenderly.co) from the ERC-8004 deploy block 428,895,443 to head 512,646,051 — 83,750,609 blocks, 228 RPC calls, 0 errors, zero Alchemy credits. The ReputationRegistry NewFeedback scan runs over the same block range on 0x8004BAa17C55a88189AE136b182e5fdA19dE9b63. Full dataset: /data/arbitrum-erc-8004-census-2026-10. Narrative: 1,604 ERC-8004 agents on Arbitrum, 108 with on-chain reputation.
Base + Ethereum reputation + metadata (live). Rows pulled from the /v1/public/stats endpoint (free, no key, no payment). Fields cited: agents_with_reputation_by_chain, feedback_events_by_chain, ethereum_registry_mints, ethereum_registry_non_empty_tokenuri, ethereum_registry_snapshot_at, commerce_backed_agents, solana_census.
What the numbers measure. A "registry mint" is a Transfer-from-zero event on the IdentityRegistry: it is a count of registrations, not a count of agents that currently serve a live agent-card.json at their advertised URL. A "distinct owner" is a unique minting address: an operator that minted many agents counts once. "Agents with reputation feedback" is a count of distinct agentIds that appear on the receiving side of at least one NewFeedback event; because the contract accepts feedback from any caller, this is a signposting metric, not a Sybil-adjusted trust signal (see Can you trust an ERC-8004 reputation score?). We report the raw count and separately maintain the commerce-backed subset at /commerce-backed-agents.
What this page is not. This is not a count of live agents at their advertised endpoints. The liveness-at-endpoint number for the cohort On-Chain Agent Intel indexes (Base + Ethereum) is in live_by_chain on /v1/public/stats and is a materially smaller number than the registration count: on the measurement date, Base shows ~9% endpoint-liveness and Ethereum shows ~47%, net ~13% across the indexed cohort. Those numbers are updated as agents come up or go down; the mint counts on this page do not change retrospectively.

Datasets — CSV / JSON downloads

Cross-chain census (Base, Ethereum, Arbitrum): dataset.csv · dataset.json · dataset.jsonld (schema.org Dataset) · dataset page
Arbitrum One full-history census: dataset.csv · summary.json · dataset.jsonld · dataset page
Live cohort stats (Base + Ethereum, measured today): api.onchainagentintel.io/v1/public/stats
Solana census snapshot (comparison, not indexed): solana_8004_census.json

Licensed CC BY 4.0 — reuse the numbers, cite the page. Cite as: Onchain Agent Intel (2026). How many ERC-8004 agents are there? Per-chain adoption stats. https://onchainagentintel.io/research/erc8004-adoption-stats.