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Sending funds from your Circle Account to an external bank account 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 EURC EUR as well.

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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. GET AN API KEY Once you have generated your API key, record it in a secure place. To send account funds externally, you will need a bank account to send to. You can use the create a wire bank account API endpoint to link a sample bank account.
Note: The parameters listed below are slightly different for US Bank accounts, non-US bank accounts that are IBAN supported and non-US bank accounts that aren’t IBAN supported. Please see the above link for details.
Request 
curl --request POST \\
--url https\://api-sandbox.circle.com/v1/businessAccount/banks/wires \\
--header 'accept: application/json' \\
--header 'authorization: Bearer ${YOUR\_API\_KEY}' \\
--header 'content-type: application/json' \\
--data '
{
  "billingDetails": {
    "name": "Satoshi Nakamoto",
    "city": "Boston",
    "country": "US",
    "line1": "100 Money Street",
    "district": "MA",
    "postalCode": "01234"
  },
  "bankAddress": {
    "bankName": "SAN FRANCISCO",
    "city": "SAN FRANCISCO",
    "country": "US",
    "line1": "100 Money Street",
    "district": "CA"
  },
  "idempotencyKey": "ba943ff1-ca16-49b2-ba55-1057e70ca5c7",
  "accountNumber": "12340010",
  "routingNumber": "121000248"
}
'
RESPONSE
JSON
{
  "data": {
    "id": "9d1fa351-b24d-442a-8aa5-e717db1ed636",
    "status": "pending",
    "description": "WELLS FARGO BANK, NA ****0010",
    "trackingRef": "CIR2GKYL4B",
    "fingerprint": "a9a71b77-d83d-4fbc-997f-41a33550c594",
    "virtualAccountEnabled": true,
    "billingDetails": {
      "name": "Satoshi Nakamoto",
      "line1": "100 Money Street",
      "city": "Boston",
      "postalCode": "01234",
      "district": "MA",
      "country": "US"
    },
    "bankAddress": {
      "bankName": "WELLS FARGO BANK, NA",
      "line1": "100 Money Street",
      "city": "SAN FRANCISCO",
      "district": "CA",
      "country": "US"
    },
    "createDate": "2023-11-04T20:02:21.062Z",
    "updateDate": "2023-11-04T20:02:21.062Z"
  }
}

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3. Fund Your Account

If you haven’t done so already, make sure you fund your account for testing. You can do this by receiving an external USDC transfer from a faucet or other source.

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4. Send Funds

Sufficient Balance RequirementYou can transfer any amount you want if your account holds sufficient balance to cover the transfer.
To send funds externally, you can use the create a payout API endpoint. REQUEST 
curl --request POST \\
--url https\://api-sandbox.circle.com/v1/businessAccount/payouts \\
--header 'accept: application/json' \\
--header 'authorization: Bearer ${YOUR\_API\_KEY}' \\
--header 'content-type: application/json' \\
--data '
{
  "destination": {
    "type": "wire",
    "id": "9d1fa351-b24d-442a-8aa5-e717db1ed636"
  },
  "amount": {
    "currency": "USD",
    "amount": "1.00"
  },
  "idempotencyKey": "ba943ff1-ca16-49b2-ba55-1057e70ca5c7"
}
'
RESPONSE
JSON
{
  "data": {
    "id": "9cf38c76-cac4-40d8-a516-f46e9a610a85",
    "amount": {
      "amount": "1.00",
      "currency": "USD"
    },
    "status": "pending",
    "sourceWalletId": "1016875042",
    "destination": {
      "type": "wire",
      "id": "9d1fa351-b24d-442a-8aa5-e717db1ed636",
      "name": "WELLS FARGO BANK, NA ****0010"
    },
    "createDate": "2023-11-04T20:04:41.669Z",
    "updateDate": "2023-11-04T20:04:41.669Z"
  }
}

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5. Check the Status of the Transfer

You can use the get a payout API endpoint to retrieve details about the status of the transaction. You can use it as in the command below. REQUEST 
curl --request GET \\
--url https\://api-sandbox.circle.com/v1/businessAccount/payouts/9cf38c76-cac4-40d8-a516-f46e9a610a85 \\
--header 'accept: application/json' \\
--header 'authorization: Bearer ${YOUR\_API\_KEY}'
RESPONSE
JSON
{
  "data": {
    "id": "9cf38c76-cac4-40d8-a516-f46e9a610a85",
    "amount": {
      "amount": "1.00",
      "currency": "USD"
    },
    "status": "pending",
    "sourceWalletId": "1016875042",
    "destination": {
      "type": "wire",
      "id": "9d1fa351-b24d-442a-8aa5-e717db1ed636",
      "name": "WELLS FARGO BANK, NA ****0010"
    },
    "createDate": "2023-11-04T20:04:41.669Z",
    "updateDate": "2023-11-04T20:04:41.778Z"
  }
}
For Circle Mint Singapore CustomersYou must verify all recipients of your transfers using the UI in the Circle Console.
🎉 Congratulations. You have successfully sent fiat using Circle’s APIs.

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6. 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.