> ## 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.

# Get the fast transfer allowance

> Check the remaining Fast Transfer allowance for USDC transfers

This how-to shows you how to retrieve the remaining Fast Transfer allowance
using the [CCTP API](/api-reference/cctp/all/get-fast-burn-usdc-allowance). The
Fast Transfer allowance is Circle's mechanism for backing faster-than-finality
USDC transfers before burns reach hard finality on source chains.

## Prerequisites

Before you begin, ensure you have:

* Installed cURL on your development machine

## Get the Fast Transfer allowance

Call the
[`GET /v2/fastBurn/USDC/allowance`](/api-reference/cctp/all/get-fast-burn-usdc-allowance)
endpoint to retrieve the current remaining Fast Transfer allowance.

**Example request**

```shell Shell theme={null}
curl --request GET \
  --url 'https://iris-api-sandbox.circle.com/v2/fastBurn/USDC/allowance' \
  --header 'Accept: application/json'
```

**Response**

```json theme={null}
{ "allowance": 99999999225.24174, "lastUpdated": "2025-12-02T13:17:02.453Z" }
```

The response includes:

* `allowance`: The remaining Fast Transfer allowance in USDC units
* `lastUpdated`: The UTC timestamp when the allowance was last updated

<Note>
  **Fast Transfer allowance details:**

  * The allowance represents the total value of USDC that can be minted through
    Fast Transfer before related burns on source chains reach hard finality.
  * When you initiate a Fast Transfer, the burn amount temporarily debits the
    allowance.
  * Once the burn reaches finality on the source chain, the corresponding amount
    is credited back to the allowance.
  * If the allowance is insufficient for your transfer, you should either wait for
    the allowance to replenish or use Standard Transfer instead.
</Note>