Networks and assets

Look up the chains your Node Token works on, the asset ids to register, and what runs where.

NetworksCopy Anchor Link

The Node Token decides the network. There is no network in the URL.

What runs on each:

Chain availabilityCopy Anchor Link

The chains above are supported. A chain is live for your node only when Exchain runs a connection to it.

• GET /v1/x402/signers lists the live EVM chains in chainIds. Check it before you register.
• A guarded Safe lives on the chain of its asset ids. Assets on two chains return 400 chain_mismatch.
• An asset id from another network returns 400 network_mismatch at registration.
• A chain without a live connection returns 503 x402_unavailable at registration.

AssetsCopy Anchor Link

All assets have 6 decimals.

• Issuers: USDC, EURC and USDCx by Circle; PYUSD and USDG by Paxos; USDT by Tether; USDM by Moneta. USDT on Arbitrum, Optimism and Polygon is USDT0.
• tUSDCx is a preprod stand-in for USDCx, minted by Exchain. Circle's own preprod USDCx is listed next to it.
• A guarded Safe may govern up to 16 of its chain's assets, each with its own mandate.
• USDT on Ethereum has no EIP-3009, and Polygon USDT0's EIP-3009 does not accept a Safe's signature. For both, Exchain co-signs a Safe transaction for direct payments and fee settlement, and x402 payments use Permit2.
• Exchain enables assets per network. An asset that is not enabled returns 400 asset_not_allowed at registration and asset_not_listed at co-sign.
• Mandates use each asset's own units. USD prices feed only value views; nothing that decides or signs reads them.