sharepoint 2010 wcf using rest api for list item insert

Check below links for Integration of WCF REST service in SharePoint, its a step by step guide for SharePoint 2013 but it will also be useful for SharePoint 2010.

Document: Integration of HTTP/ HTTPs WCF Services (REST & SOAP) in SharePoint 2013

Code: WCF REST Service Integration in SharePoint 2013

There is no transactions in SharePoint Object model like ADO.NET but once you submitted data from your page, then it will goes to server for further proceedings. So insert in looping will working but if their if code throw any exception then it will stop inserting.

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Adnan Amin MCT, SharePoint Architect | If you find this post useful kindly please mark it as an answer.