The built in API support for Odoo is based on XML-RPC, there is no native REST API - you will find third party Apps for Odoo that extend it and provide a REST API.

https://apps.odoo.com/apps/modules/browse?search=REST+API

Read about our API at https://www.odoo.com/documentation/master/developer/api/external_api.html

Hello Juliana Cardenas,

Can you specify that for which purpose you want to use xml-rpc and API ? 

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari