> [!CAUTION]
> **Reminder:** To use the Isochrones API, you must [enable billing](https://console.cloud.google.com/project/_/billing/enable?utm_source=Docs_BillingNudge) on each of your projects and include an [API key](https://developers.google.com/maps/documentation/isochrones/get-api-key.md.txt) or OAuth token with all API or SDK requests.

## How the Isochrones API is billed

The Isochrones API uses a pay-as-you-go pricing model. Each request to the
`GenerateIsochrone` method of the API generates a billable
event.

> [!NOTE]
> **Note:**The Isochrones API is in the pre-GA Preview stage, and there's no charge for API usage during Preview. API calls will appear on the Billing page in the Cloud Console, but charges will be $0. Because there's no charge for API usage during Preview, this pricing information is for informational use only.

## SKU details and pricing for the Isochrones API

### How SKUs are triggered

You are billed for requests to the `GenerateIsochrone`
method.

The following tables show the expected price per 1,000 requests after the
product reaches GA.

### Global pricing (excluding India)

Prices are per 1,000 requests. Usage is calculated on a monthly basis.

| SKU Name | Free Usage Cap | Cap - 100,000 | 100,001 - 500,000 | 500,001 - 1,000,000 | 1,000,001 - 5,000,000 | 5,000,001+ |
| Essentials |||||||
|---|---|---|---|---|---|---|
| Isochrones API | 10,000 | $3.00 | $2.40 | $1.80 | $0.90 | $0.24 |

### India pricing

Prices are per 1,000 requests. Usage is calculated on a monthly basis.

| SKU Name | Free Usage Cap | Cap - 5,000,000 | 5,000,001+ |
| Essentials ||||
|---|---|---|---|
| Isochrones API (India) | 70,000 | $0.90 | $0.24 |

> [!NOTE]
> **Note:**When this product goes to GA, it will be included in the Essentials and Pro subscription plans.

## Quota limits

The Isochrones API enforces the following usage limits:

- **Requests per minute (QPM)**: 300 requests per minute per project (5 requests per second average).

When your project exceeds the per-minute quota, the API returns an HTTP `429 Too Many Requests` response with status `RESOURCE_EXHAUSTED`. Implement client-side rate limiting and retry `429` responses using exponential backoff with jitter.

To review and manage your quotas and usage limits for the Isochrones API, see
[Quotas and quota alerts](https://developers.google.com/maps/billing-and-pricing/manage-costs.md.txt#quotas).

<br />

## Adjust quota


Quota limits define the maximum number of requests allowed for a specific API or service within a
given timeframe. When the number of requests in your project reaches the quota limit, your service
stops responding to requests.

> [!IMPORTANT]
> **Important:** To understand how a quota increase might affect your bill, see the [pricing calculator](https://mapsplatform.google.com/pricing/#pricing-calculator).

To modify a quota value for your API, follow these steps:

1. In the Cloud console, go to **Google Maps Platform \> Quotas**.
2. Select the API for which you want to modify the quota.
3. Identify the quota value that you want to change, and select it using the checkbox.
4. Click **Edit** , enter a new quota value, and click **Submit request**.

### View quota increase requests

> [!IMPORTANT]
> **Important:** You must have the appropriate [IAM permissions to view quota increase requests](https://cloud.google.com/docs/quotas/permissions#permissions_increase).

To view all quota increase requests, including past and pending requests, follow these steps:

1. In the Cloud console, go to **Google Maps Platform \> Quotas**.
2. Select the API for which you want to view the quota increase request.
3. Click **Increase Requests**.

> [!TIP]
> **Tip:** Monitor your quota usage regularly to avoid service interruptions. For more information, see [Quotas and quota alerts](https://developers.google.com/maps/billing-and-pricing/manage-costs.md.txt#quotas).

## Terms of Use restrictions

For complete details on allowed usage, see the Google Maps Platform Terms of Service
[License Restrictions](https://cloud.google.com/maps-platform/terms/#3.-license.).