PurchaseReservedInstancesOffering - Amazon Elastic Compute Cloud
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Purchases a Reserved Instance for use with your account. With Reserved Instances, you pay a lower hourly rate compared to On-Demand instance pricing.

Use DescribeReservedInstancesOfferings to get a list of Reserved Instance offerings that match your specifications. After you've purchased a Reserved Instance, you can check for your new Reserved Instance with DescribeReservedInstances.

To queue a purchase for a future date and time, specify a purchase time. If you do not specify a purchase time, the default is the current time.

For more information, see Reserved Instances and Reserved Instance Marketplace in the Amazon EC2 User Guide.

Request Parameters

The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see Common Query Parameters.


Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation. Otherwise, it is UnauthorizedOperation.

Type: Boolean

Required: No


The number of Reserved Instances to purchase.

Type: Integer

Required: Yes


Specified for Reserved Instance Marketplace offerings to limit the total order and ensure that the Reserved Instances are not purchased at unexpected prices.

Type: ReservedInstanceLimitPrice object

Required: No


The time at which to purchase the Reserved Instance, in UTC format (for example, YYYY-MM-DDTHH:MM:SSZ).

Type: Timestamp

Required: No


The ID of the Reserved Instance offering to purchase.

Type: String

Required: Yes

Response Elements

The following elements are returned by the service.


The ID of the request.

Type: String


The IDs of the purchased Reserved Instances. If your purchase crosses into a discounted pricing tier, the final Reserved Instances IDs might change. For more information, see Crossing pricing tiers in the Amazon Elastic Compute Cloud User Guide.

Type: String


For information about the errors that are common to all actions, see Common client error codes.


Example 1

This example uses a limit price to limit the total purchase order of Standard Reserved Instances from the Reserved Instance Marketplace.

Sample Request

https://ec2.amazonaws.com/?Action=PurchaseReservedInstancesOffering &ReservedInstancesOfferingId=4b2293b4-5813-4cc8-9ce3-1957fEXAMPLE &LimitPrice.Amount=200 &InstanceCount=2 &AUTHPARAMS

Sample Response

<PurchaseReservedInstancesOfferingResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/"> <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId> <reservedInstancesId>e5a2ff3b-7d14-494f-90af-0b5d0EXAMPLE</reservedInstancesId> </PurchaseReservedInstancesOfferingResponse>

Example 2

This example illustrates a purchase of a Reserved Instances offering.

Sample Request

https://ec2.amazonaws.com/?Action=PurchaseReservedInstancesOffering &ReservedInstancesOfferingId=4b2293b4-5813-4cc8-9ce3-1957fEXAMPLE &InstanceCount=2 &AUTHPARAMS

Sample Response

<PurchaseReservedInstancesOfferingResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/"> <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId> <reservedInstancesId>e5a2ff3b-7d14-494f-90af-0b5d0EXAMPLE</reservedInstancesId> </PurchaseReservedInstancesOfferingResponse>

See Also

For more information about using this API in one of the language-specific Amazon SDKs, see the following: