To promote the creation of reusable, high-quality data/dataset, the following criteria are required for the data repository:

A persistent identifier: The data/dataset must have a persistent identifier (such as a digital object identifier, DOI).

Free access: The data/dataset must be available free of charge and without any barriers except for a standard registration to get a login free of charge.

Liberal copyright: Anyone must be free to copy, distribute, transmit, and adapt the datasets as long as they give credit to the original authors.

Reference:
"Core Trustworthy Data Repositories Requirements" by the ICSU World Data System

WDS certified data repositories : http://www.re3data.org/search?query=&certificates%5B%5D=WDS
DSA certified data repositories : http://www.re3data.org/search?query=&certificates%5B%5D=DSA
Find appropriate repositories registered in FAIRsharing.org : https://fairsharing.org/