_Circle APIs support [idempotent requests](🔗), which are a type of request method that executes only once no matter how many times the request is sent. Result: you can safely retry API calls when things go wrong during a transaction (such as a network connection issue) before you receive a response._

• To ensure a request is idempotent, you must generate and provide an idempotency key formatted as a GUID.

• Subsequent requests with the same idempotencyKey parameter value will produce the same result as the initial request.

• The `idempotencyKey` body parameter must be sent in [UUID format](🔗).

# Operations that support idempotency

The following Circle API operations support idempotent requests. Check the API reference for more details.

• ** Core Functionality **

  • [Create a payout.](🔗)

  • [Create a wire bank account.](🔗)

  • [Create a business transfer.](🔗)

  • [Create a deposit address.](🔗)

  • [Create a recipient address.](🔗)

• ** Payments API**

  • [Create a payment intent.](🔗)

  • [Expire a payment intent.](🔗)

  • [Refund a payment intent.](🔗)

• **Payouts API**

  • [Create a payout.](🔗)

  • [Create a recipient address.](🔗)

• ** Accounts API**

  • [Create a sub-account.](🔗)

  • [Create a blockchain address.](🔗)

  • [Create a transfer.](🔗)