Each time exists a greater amount of Learning Objects (LO) available through repositories, and federations, which were created to support teaching and learning processes. For that the users have an appropriate experience to access these resources, we need to deliver material of quality, that meets some minimum conditions, among them, that their metadata describe the content as much as possible, it matches the metadata standard definition, and the coherence between your values. These aspects affect management activities to LO, including the process of search and retrieval, so it requires initiatives to support the evaluation of metadata. Proposes a Web service for evaluation of LO metadata automatically, which receives a list with the results of a search and returns it to organized according to the quality level of metadata, which is established through the application of metrics for evaluation of metadata. This proposal is oriented to that the user who performs the search only receive LO that meets certain requirements and displayed as first results those who have better conditions.