Altmetrics aggregators who draw together diverse sources of data about the use of research products face a fundamental challenge: the myriad dissemination and archival platforms used by academics can make it difficult (if not impossible) to get consistent and normalized access to the data they need. While a general consensus is emerging among online publishers and repositories of articles, datasets, software, and other materials that such impact data could be valuable to their users, no clear standards exist governing how organizations should make that data accessible to others.This grant funds efforts by the National Information Standards Organization (NISO) to lead a two-year standard-setting process for altmetrics data. NISO will begin by hosting a series of scoping meetings over the first 12 months of the grant, bringing stakeholders together to map the most salient sources of data based on demand from altmetrics services as well as the researchers, funders, and deans that represent altmetrics end-users. After synthesizing those findings in a white paper for wide distribution, NISO will shift into a formal standards-setting process targeting the most pressing use cases, ultimately producing standard data exchange formats for adoption by those who produce and consume altmetrics data.