Base holds the largest real, working ERC-8004 population, and Ethereum mainnet the highest-quality cohort. Of the 26,978 agents currently indexed across Base and Ethereum mainnet, roughly 23,705 live on Base and 3,273 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 710,900 indexed feedback events touching 155,767 distinct ERC-8004 agent IDs on the full registry (including registrations outside our index). Feedback events are the first on-chain signal that separates an agent that is used from one that is merely reachable. Of these, 51 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 18,264 agents stamped by our deterministic buyer-POV gate, only 62 are Transact-ready: reachable, with a valid way to pay, either a score of 75 or more or a successful paid delivery from us in the last 30 days, and the anti-spam checks passed. 32 are Payment verified and 0 have paying customers (how the steps work). For scale, 282 agents advertise x402 at all, so the Transact-ready count is not the total of agents that can take a payment (definitions). 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.