_Sending funds from your Circle Account to external blockchain wallets is one of the most basic primitives (building blocks) enabled by the APIs. This quickstart walks through sending USDC `USD` externally. You can follow the same steps when sending EUROC `EUR` as well._

# 1. Get an API key

Circle's APIs use [API keys](🔗) as the mechanism to authenticate client requests. The API key must be set in the `Authorization` header of the request sent from your backend server. The format of the header is `Bearer secret-key-value`.

To obtain an API key for the sandbox environment, simply [create an account](🔗) and generate a new key in settings - it only takes a few seconds.

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Once you have generated your API key, record it in a secure place.

# 2. Fund Your Account

If you haven't done so already, make sure you [fund your account for testing](🔗). You can do this one of two ways: by using the Circle Payments API to accept a payment, or by receiving an external USDC transfer from a faucet or other source.

# 3. Send Funds

To send account funds externally, you will need a blockchain address to send to (`destination`).

The [sandbox environment](🔗) is connected to the [Ethereum Sepolia testing network](🔗), so the destination blockchain address has to be a valid Sepolia address.

USDC is connected to testing networks on other blockchains as well. This guide focuses on Ethereum but works similarly for other blockchains. For information on other testing networks see [Test USDC](🔗)

To keep things simple, we'll transfer funds to the deposit address of the [USDC faucet service on Sepolia](🔗). That address is `0x493A9869E3B5f846f72267ab19B76e9bf99d51b1`.

You can transfer any amount you want, provided your account has sufficient balance to cover the transfer.

To send funds externally, you will use the [create account transfer endpoint](🔗).

For Circle Mint Singapore Customers

You must verify all recipients of your transfers using the UI in the Circle Console.

Transfers to unverified addresses will be held in `pending` status until the addresses are verified.

Since Circle's APIs are [designed for multiple future chains and currencies](🔗), you have to specify the `currency` and `chain` you want to utilize. You can create a transfer by using the command below.

The response should look like this:

# 4. Check the Status of the Transfer

You can use the [get transfer endpoint](🔗) to retrieve details about the status of the transaction. You can use it as in the command below.

The response should look like this:

  • Some notes on the process: The very first state transition for a transfer sets the `status` to `created` and the `transactionHash` to `null`. At this point Circle has just started processing the on-chain send. When Circle broadcasts the transfer a few seconds later, its `status` will change to `running`. It will also display a `transactionHash` you can use to track the transfer on chain (you can look it up on [Etherscan's tracker on Sepolia](🔗)).

Though not yet settled, you can consider the transaction complete because it has been successfully broadcasted to the network. Circle's systems will continue to track the transfer for 30 confirmations, at which point its `status` will change to `complete`. Except for certain cases, you do not have to worry about waiting for the `complete` state, which is most important when receiving external transfers. You can [read more about block confirmations here](🔗).

🎉 Congratulations. You have successfully sent cryptocurrency using Circle's APIs.

# 5. Ready for the next step?

After experimenting with our APIs, you’ll want to start building test integrations in sandbox prior to moving into production. Start by [applying for a Circle Mint account](🔗). We'll be happy to walk you through the next steps.