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Documentation Index

Fetch the complete documentation index at: https://developers.circle.com/llms.txt

Use this file to discover all available pages before exploring further.

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Supported blockchains

xReserve operates across multiple blockchains. Each supported blockchain serves one or more of the following roles:
  • Source chains where Circle-deployed xReserve smart contracts hold USDC reserves.
  • Remote chains where USDC-backed stablecoins are issued.
  • Destination chains where USDC or USDC-backed stablecoins are ultimately withdrawn.

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Source chains

The following tables list the mainnet and testnet blockchains where xReserve smart contracts have been deployed. Users deposit USDC into these contracts to receive an equal amount of USDC-backed stablecoins on remote blockchains. Mainnet
BlockchainUSDC token addressxReserve contract address
Ethereum0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB480x8888888199b2Df864bf678259607d6D5EBb4e3Ce
Testnet
BlockchainUSDC token addressxReserve contract address
Arc Testnet0x36000000000000000000000000000000000000000x008888878f94C0d87defdf0B07f46B93C1934442
Ethereum Sepolia0x1c7D4B196Cb0C7B01d743Fbc6116a902379C72380x008888878f94C0d87defdf0B07f46B93C1934442

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Remote chains

The following tables list the mainnet and testnet xReserve partner blockchains where USDC-backed stablecoins can be minted. Mainnet
BlockchainToken symbolToken address or identifier
AleoUSDCxusdcx_stablecoin.aleo
CantonUSDCxInstrumentId.id: USDCx
InstrumentId.admin: decentralized-usdc-interchain-rep::12208115f1e168dd7e792320be9c4ca720c751a02a3053c7606e1c1cd3dad9bf60ef
CardanoUSDCx1f3aec8bfe7ea4fe14c5f121e2a92e301afe414147860d557cac7e345553444378
MovementUSDCx0xba11833544a2f99eec743f41a228ca6ffa7f13c3b6b04681d5a79a8b75ff225e
StacksUSDCxSP120SBRBQJ00MCWS7TM5R8WJNTTKD5K0HFRC2CNE.usdcx
Testnet
BlockchainToken symbolToken address or identifier
Aleo TestnetUSDCxtest_usdcx_stablecoin.aleo
Canton TestNetUSDCxInstrumentId.id: USDCx
InstrumentId.admin: decentralized-usdc-interchain-rep::122049e2af8a725bd19759320fc83c638e7718973eac189d8f201309c512d1ffec61
Cardano PreprodUSDCx31dde3db98ad05feb688d4dbb146b3b6054e1246cbcef98c79b0bf665553444378
Movement BardockUSDCx0x63f169ba69623ba6ccf34620857644feb46d0f87e1d7bbcf8c071d30c3d94bd6
Stacks TestnetUSDCxST1PQHQKV0RJXZFY1DGX8MNSNYVE3VGZJSRTPGZGM.usdcx

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Destination chains

These are the destination blockchains where USDC or USDC-backed stablecoins are ultimately withdrawn:
  • Gateway supported blockchains: Because xReserve holds USDC in Gateway wallets, users can withdraw USDC on any Gateway supported blockchain, including the source chain.
  • CCTP supported blockchains: If a blockchain is not supported by Gateway, xReserve uses CCTP to forward the funds to another blockchain. This lets users withdraw USDC on any CCTP supported blockchain.
  • Another remote blockchain: Users can burn USDC-backed stablecoins on one remote blockchain to withdraw USDC-backed stablecoins on a different remote blockchain.

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Domain identifiers

A domain is a Circle-issued numeric identifier for a blockchain. xReserve uses domain identifiers in messages and attestations. Domain identifiers don’t map to any existing public chain ID. xReserve domains fall into two categories:
  • Source domains are the blockchains on which USDC is held in an xReserve contract.
  • Remote domains are the blockchains on which USDC-backed stablecoins are deployed, minted, and circulated.
Use the Get domain information endpoint to retrieve a list of all source and remote domains.

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Source domains

DomainName
0Ethereum
26Arc Testnet

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Remote domains

DomainName
10001Canton
10002Aleo
10003Stacks
10004Cardano
10005Movement