Base holds the largest real, working ERC-8004 population, and Ethereum mainnet the highest-quality cohort. Of the 113,188 agents currently indexed across Base and Ethereum mainnet, roughly 19,608 live on Base and 1,950 on Ethereum mainnet. Base is where actual agent commerce is happening; on Ethereum the base rate says a registered agent is probably a real deployment rather than a placeholder.
On-chain reputation is real, and concentrated on Base. The ERC-8004 ReputationRegistry now carries 277,710 indexed feedback events touching 29,128 distinct agents. Feedback events are the first on-chain signal that separates an agent that is used from one that is merely reachable. Of these, 44 agents carry commerce-backed feedback — reputation attested by an ERC-8183 / ACP hook after a completed paid job, not by a batch bot.
Very few agents are safe to route a paying job to today. Of 90,974 agents stamped by our deterministic buyer-POV gate, only 16,224 currently hold a Transact-ready mark — reachable, TLS-valid, freshly probed, and either receiving on-chain payments or advertising a working x402 discovery response. The gap between "registered on-chain" and "integratable this afternoon" is enormous, and it is the number that matters for anyone shipping agent-to-agent flows.