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.
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
2026-08-27 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.
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).
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 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
(2026-08-27 UTC), 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.
# 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
Arbitrum One is where the same rail runs against a well-served
baseline; 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.
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Registration on it is permissionless.`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`const`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#4FC1FF`},children:` name`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:` =`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#C586C0`},children:` await`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:` client`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`.`}),_jsx(_components.span,{style:{color:`#8250DF`,\"--shiki-dark\":`#DCDCAA`},children:`readContract`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`({`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:` address:`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` '0x8004a169fb4a3325136eb29fa0ceb6d2e539a432'`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`,`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:` abi:`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` [{ `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`type:`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'function'`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`, `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`name:`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'name'`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`, `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`stateMutability:`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'view'`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`, `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`inputs:`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` [], `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`outputs:`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` [{ `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`type:`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'string'`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` }] }],`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:` functionName:`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'name'`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`,`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`})`})}),`\n`]})})})]}),`\n`,_jsx(Heading,{level:`2`,id:`what-is-deployed`,children:`What is deployed`}),`\n`,_jsxs(Table,{children:[_jsx(_components.thead,{children:_jsxs(_components.tr,{children:[_jsx(_components.th,{children:`Contract`}),_jsx(_components.th,{children:`Address`})]})}),_jsxs(_components.tbody,{children:[_jsxs(_components.tr,{children:[_jsx(_components.td,{children:`IdentityRegistry`}),_jsx(_components.td,{\"data-numeric\":`true`,children:_jsx(_components.a,{href:`https://basescan.org/address/0x8004a169fb4a3325136eb29fa0ceb6d2e539a432`,children:_jsx(_components.code,{children:`0x8004a169fb4a3325136eb29fa0ceb6d2e539a432`})})})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:`ReputationRegistry`}),_jsx(_components.td,{\"data-numeric\":`true`,children:_jsx(_components.a,{href:`https://basescan.org/address/0x8004BAa17C55a88189AE136b182e5fdA19dE9b63`,children:_jsx(_components.code,{children:`0x8004BAa17C55a88189AE136b182e5fdA19dE9b63`})})})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:`USDC (settlement)`}),_jsx(_components.td,{\"data-numeric\":`true`,children:_jsx(_components.a,{href:`https://basescan.org/address/0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`,children:_jsx(_components.code,{children:`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`})})})]})]})]}),`\n`,_jsx(_components.p,{children:`We deployed none of these. The registries were already live and registering on them is\npermissionless; what is ours is agent #73232 and the rail on top. There is no\nValidationRegistry in this family, so a KYA result cannot be anchored on-chain here.`}),`\n`,_jsx(Heading,{level:`2`,id:`the-price-and-where-it-comes-from`,children:`The price, and where it comes from`}),`\n`,_jsxs(_components.p,{children:[`The base price of a tool is identical on every chain we sell on; the only difference is\nthe disclosed settlement fee, because we broadcast on the buyer’s behalf and that costs\ngas. On Base a real settlement measured `,_jsx(_components.strong,{children:`102828 gas at an effective 0.006 gwei`}),`\n(2026-08-27 UTC), about `,_jsx(_components.strong,{children:`0.00000062 ETH`}),` including the L1 data fee, roughly `,`$0.0025, so\nthe fee here is **$`,`0.005**: the same 2x-headroom logic as Arbitrum One, against a base\nfee that sits near its floor rather than moving. The measurement lives in the chain\nregistry beside the token, so the number is traceable rather than asserted.`]}),`\n`,_jsx(Heading,{level:`2`,id:`verify-it-yourself`,children:`Verify it yourself`}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`12`,language:`shellscript`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`shellscript`,children:_jsxs(_components.code,{language:`shellscript`,numberOfLines:`12`,children:[_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:`# The signing domain, straight from the token.`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#953800`,\"--shiki-dark\":`#DCDCAA`},children:`curl`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -sX`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` POST`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` https://mainnet.base.org`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -H`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'content-type: application/json'`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D7BA7D`},children:` \\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -d`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` '{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"eth_call\",\"params\":[{\"to\":\"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\",\"data\":\"0x3644e515\"},\"latest\"]}'`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:`# -> 0x02fa7265e7c5d81118673727957699e4d68f74cd74b7db77da710fe8a2c7834f`})}),`\n`,_jsx(_components.span,{className:`line`}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:`# Our agent on the canonical registry, answering live: ownerOf(73232).`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#953800`,\"--shiki-dark\":`#DCDCAA`},children:`curl`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -sX`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` POST`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` https://mainnet.base.org`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -H`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'content-type: application/json'`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D7BA7D`},children:` \\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -d`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` '{\"jsonrpc\":\"2.0\",\"id\":2,\"method\":\"eth_call\",\"params\":[{\"to\":\"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432\",\"data\":\"0x6352211e0000000000000000000000000000000000000000000000000000000000011e10\"},\"latest\"]}'`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:`# -> 0x...d305607510e0db2c95807173c7a05bea53c1ed36`})}),`\n`,_jsx(_components.span,{className:`line`}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:`# Our provenance ledger for this rail, re-read live on every request.`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#953800`,\"--shiki-dark\":`#DCDCAA`},children:`curl`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -s`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` https://a-identity-backend.onrender.com/api/proof/base`})]}),`\n`]})})}),`\n`,_jsx(Heading,{level:`2`,id:`where-base-fits`,children:`Where Base fits`}),`\n`,_jsxs(_components.p,{children:[_jsx(_components.a,{href:`/chains/arbitrum`,children:`Arbitrum One`}),` is where the same rail runs against a well-served\nbaseline; `,_jsx(_components.a,{href:`/chains/robinhood`,children:`Robinhood Chain`}),` is where it settles in Paxos USDG rather\nthan USDC; `,_jsx(_components.a,{href:`/chains/arc`,children:`Arc`}),` holds escrow and the spend vault. Base is\nwhere the agent ecosystem itself lives, and the `,_jsx(_components.a,{href:`/chains/gateway`,children:`Gateway`}),` hop already\nproves USDC minted on Base Sepolia from an Arc deposit.`]})]})}function MDXContent(props={}){const{wrapper:MDXLayout}={..._provideComponents(),...props.components};return MDXLayout?_jsx(MDXLayout,{...props,children:_jsx(_createMdxContent,{...props})}):_createMdxContent(props)}return{default:MDXContent};function _missingMdxReference(id,component){throw new Error(`Expected `+(component?`component`:`object`)+\" `\"+id+\"` to be defined: you likely forgot to import, pass, or provide it.\")}","frontmatter":{},"scope":{"config":{},"pageMetadata":{"title":"Build on Base","description":"Base network config, the canonical ERC-8004 registries verified live there, and our x402 rail wired to settle in native Circle USDC.","href":"/chains/base"}}},"mdxSourceWithNoJs":null},"mdxExtracts":{"tableOfContents":[{"title":"Why Base","slug":"why-base","depth":2,"children":[]},{"title":"Network config","slug":"network-config","depth":2,"children":[]},{"title":"Connect with viem","slug":"connect-with-viem","depth":2,"children":[]},{"title":"What is deployed","slug":"what-is-deployed","depth":2,"children":[]},{"title":"The price, and where it comes from","slug":"the-price-and-where-it-comes-from","depth":2,"children":[]},{"title":"Verify it yourself","slug":"verify-it-yourself","depth":2,"children":[]},{"title":"Where Base fits","slug":"where-base-fits","depth":2,"children":[]}],"codeExamples":{}},"jsLinks":[],"subdomain":"a-identity","siteName":"A-Identity","title":"A-Identity Docs : Passport \u0026 Wallet for the Agentic Economy","navMaps":{"firstHrefInVersion":{},"firstHrefInLanguage":{}},"lastModified":"2026-10-11T18:04:28.154Z","originalFileLocation":"chains/base.mdx"},"headHtml":"\u003cscript data-mint-head>(function(){var d=document.documentElement,p=null;if(!p){try{p=localStorage.getItem(\"isDarkMode\")}catch(e){}if(p==='true')p='dark';else if(p==='false')p='light';if(p!=='light'\u0026\u0026p!=='dark'\u0026\u0026p!=='system')p=\"system\"}var r=p==='system'?(matchMedia(\"(prefers-color-scheme: dark)\").matches?'dark':'light'):p;d.classList.remove(r==='dark'?'light':'dark');d.classList.add(r);d.setAttribute(\"data-theme-preference\",p)})();\u003c/script>\u003cmeta data-mint-head name=\"description\" content=\"Base network config, the canonical ERC-8004 registries verified live there, and our x402 rail wired to settle in native Circle USDC.\">\u003cmeta data-mint-head name=\"keywords\" content=\"agentic economy, ERC-8004, x402, Circle Arc, USDC, Nanopayments, CCTP, agent identity, Know Your Agent, bounded authority\">\u003cmeta data-mint-head name=\"application-name\" content=\"A-Identity\">\u003cmeta data-mint-head name=\"generator\" content=\"Mintlify\">\u003clink data-mint-head rel=\"icon\" type=\"image/png\" sizes=\"192x192\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon/android-chrome-192x192.png\" media=\"(prefers-color-scheme: light)\">\u003clink data-mint-head rel=\"apple-touch-icon\" type=\"image/png\" sizes=\"180x180\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon/apple-touch-icon.png\">\u003clink data-mint-head rel=\"icon\" type=\"image/png\" sizes=\"16x16\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon/favicon-16x16.png\" media=\"(prefers-color-scheme: light)\">\u003clink data-mint-head rel=\"icon\" type=\"image/png\" sizes=\"32x32\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon/favicon-32x32.png\" media=\"(prefers-color-scheme: light)\">\u003clink data-mint-head rel=\"shortcut icon\" type=\"image/x-icon\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon/favicon.ico\" media=\"(prefers-color-scheme: light)\">\u003clink data-mint-head rel=\"icon\" type=\"image/png\" sizes=\"192x192\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon-dark/android-chrome-192x192.png\" media=\"(prefers-color-scheme: dark)\">\u003clink data-mint-head rel=\"icon\" type=\"image/png\" sizes=\"16x16\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon-dark/favicon-16x16.png\" media=\"(prefers-color-scheme: dark)\">\u003clink data-mint-head rel=\"icon\" type=\"image/png\" sizes=\"32x32\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon-dark/favicon-32x32.png\" media=\"(prefers-color-scheme: dark)\">\u003clink data-mint-head rel=\"shortcut icon\" type=\"image/x-icon\" href=\"/mintlify-assets/_mintlify/favicons/a-identity/lHOai_LVMeGoJ7Ma/_generated/favicon-dark/favicon.ico\" media=\"(prefers-color-scheme: dark)\">\u003cmeta data-mint-head property=\"og:title\" content=\"A-Identity Docs : Passport \u0026amp; Wallet for the Agentic Economy\">\u003cmeta data-mint-head property=\"og:description\" content=\"ERC-8004 identity, x402 + Circle Nanopayments, Gateway, and CCTP on Circle Arc, Celo, X Layer and Robinhood Chain. 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