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Unsupported assetsCircle Mint and Circle APIs only support USDC and EURC tokens on the indicated blockchains. Don’t send unsupported tokens such as USDT or bridged USDC to your Circle Mint address. Doing so might result in a loss of funds.Cosmos appchainsCircle Mint and Circle APIs only support USDC from Noble. If you transfer USDC from Noble to other appchains via IBC (Inter-Blockchain Communication), you must transfer it back to Noble before you transfer it to your Circle Mint address.Don’t attempt to deposit USDC from an appchain other than Noble to your Circle Mint address. Doing so might result in a loss of funds.Polkadot parachainsCircle Mint and Circle APIs only support USDC from Polkadot Asset Hub. If you transfer USDC from Polkadot Asset Hub to other parachains via XCM, you must transfer it back to Polkadot Asset Hub before you transfer it to your Circle Mint address.Don’t attempt to deposit XCM-transferred USDC from a parachain other than Polkadot Asset Hub to your Circle Mint address. Doing so might result in a loss of funds.InjectiveCircle Mint only supports USDC deposits on Injective through the EVM layer. Cosmos-layer USDC deposits are not supported. If you deposit USDC through the Cosmos layer, your funds are stuck and not credited to your Circle Mint account. To recover stuck funds, contact Circle Support.
Arc (ARC) is only available in the sandbox environment (api-sandbox.circle.com), where the chain code refers to Arc testnet.

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USDC

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EURC

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cirBTC

For an overview of cirBTC and how it works, see What is cirBTC?.

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Using chains and currencies in the API

Any time you refer to a currency in a Circle Mint API call, you use a currency and chain pair. For example, to create a USDC transfer on Ethereum, specify the USD currency on the ETH chain. When referring to balances, you only need to refer to the currency because the value of the currency for Circle-hosted assets is independent of the chain.