Build on Base

Base network config, the canonical ERC-8004 registries verified live there, and our x402 rail wired to settle in native Circle USDC.

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 settles 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 puts the same code path and receipt standard next to the crowd it was designed for.

Base is live for us: agent #73232 is ours on the canonical registry (minted 2026-08-28), 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.

Network config

Field	Value
Chain ID	8453
CAIP-2	eip155:8453
Native currency	ETH (18 decimals)
RPC (HTTP)	https://mainnet.base.org (fallback https://base-rpc.publicnode.com)
Block explorer	basescan.org
USDC	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
CCTP domain	6

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

chain.ts

import { base } from 'viem/chains'
import { createPublicClient, http } from 'viem'

export const client = createPublicClient({ chain: base, transport: http() })

What is deployed

Contract	Address
IdentityRegistry	0x8004a169fb4a3325136eb29fa0ceb6d2e539a432
ReputationRegistry	0x8004BAa17C55a88189AE136b182e5fdA19dE9b63
USDC (settlement)	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

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. There is no ValidationRegistry in this family, so a KYA result cannot be 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; the only difference is the 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 (2026-08-28), about 0.00000062 ETH including the L1 data fee, roughly $0.0025, so the fee here is **$0.005**: the same 2x-headroom logic as Arbitrum One, against a base fee that sits near its floor rather than moving. The measurement lives in the chain registry beside the token, so the number is traceable rather than asserted.

Verify it yourself

# The signing domain, straight from the token.
curl -sX POST https://mainnet.base.org -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{"to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","data":"0x3644e515"},"latest"]}'
# -> 0x02fa7265e7c5d81118673727957699e4d68f74cd74b7db77da710fe8a2c7834f

# Our agent on the canonical registry, answering live: ownerOf(73232).
curl -sX POST https://mainnet.base.org -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":2,"method":"eth_call","params":[{"to":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432","data":"0x6352211e0000000000000000000000000000000000000000000000000000000000011e10"},"latest"]}'
# -> 0x...d305607510e0db2c95807173c7a05bea53c1ed36

# Our provenance ledger for this rail, re-read live on every request.
curl -s https://a-identity-backend.onrender.com/api/proof/base

Where Base fits

Arbitrum One is where the same rail runs against a well-served baseline; Robinhood Chain is where it runs on a chain with no published facilitator; 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.