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Base is Coinbase’s Ethereum L2 and one of the busiest agent ecosystems on any chain. A-Identity holds ERC-8004 agent #73232 on the canonical registry here and has settled paid trust calls in native Circle USDC through its own EIP-3009 facilitator.

Why Base

Native Circle USDC

Real USDC, not a bridged twin, and it implements EIP-3009, so a buyer can sign a transfer and never touch gas.

ERC-8004 already live

The canonical identity and reputation registries were deployed here by their authors, at the same addresses X Layer, Celo, Robinhood Chain and Arbitrum One carry.

Where the agents are

The x402 standard grew up around this ecosystem. Running our rail here put the same code path and receipt standard next to the crowd it was designed for, until it paused on 2026-11-11.
Base is live for us: agent #73232 is ours on the canonical registry (minted 2026-08-27 UTC), and a real settlement in USDC has gone through our own facilitator with the receipt carrying the matching Transfer log. Everything on this page, including the Stellar funding hop behind the operating wallets, is checkable at /proof/base.Since 2026-11-11 our EIP-3009 rail has been paused on Base, until its new gas-only broadcaster key has gas on this chain. Circle Gateway nanopayments (eip155:8453) still sell the same tools here, gasless on both sides, and since 2026-11-11 they have been the only rail of ours that sells on Base; no Gateway-credited call has been read back on this chain yet, so that rail stays labeled unproven on /proof/base. Agent #73232 is still held by our former operating wallet 0xd305607510E0Db2c95807173c7A05BEA53c1ed36; someone else has also held that wallet’s key since at least 2026-11-01, so never pay or fund it.

Network config

A verification trap specific to this chain, recorded so nobody falls into it twice: Arc’s three testnet-era registry addresses also have code on Base, 130 bytes each, minimal-proxy sized, delegating to a NON-canonical implementation. Same address, different contract. eth_getCode answering “yes” therefore means nothing here. The canonical pair below was verified by reading each proxy’s EIP-1967 implementation slot and matching the implementation bytecode byte for byte against Arbitrum One (2026-08-28).

Connect with viem

What is deployed

We deployed none of these. The registries were already live and registering on them is permissionless; what is ours is agent #73232 and the rail on top. The mainnet family’s ValidationRegistry proxy, 0x8004Cc8439f36fd5F9F049D9fF86523Df6dAAB58, has code here too (read live 2026-10-11; an earlier version of this page said none existed, which was wrong). It is not one of the testnet-era addresses in the warning above. We do not wire it, so a KYA result is not anchored on-chain here.

The price, and where it comes from

The base price of a tool is identical on every chain we sell on. While our EIP-3009 rail ran here, the only difference was a disclosed settlement fee, because we broadcast on the buyer’s behalf and that costs gas. On Base a real settlement measured 102828 gas at an effective 0.006 gwei (2026-08-27 UTC), about 0.00000062 ETH including the L1 data fee, roughly $0.0025, so the fee here was **$0.005**, 2x the measured cost, against a base fee that sat near its floor rather than moving. That rail has been paused here since 2026-11-11; Circle Gateway nanopayments, which still sell here, carry no settlement fee because we broadcast nothing on them. The measurement lives in the chain registry beside the token, so the number is traceable rather than asserted.

Verify it yourself

Where Base fits

Arbitrum One is where the same rail ran against a well-served baseline until 2026-11-11; Robinhood Chain is where it settles in Paxos USDG rather than USDC; Arc holds escrow and the spend vault. Base is where the agent ecosystem itself lives, and the Gateway hop already proves USDC minted on Base Sepolia from an Arc deposit.