Adding Basemaps In QGIS 3.0
Adding Basemaps In QGIS 3.0
We can add more basemaps into QGIS 3.x by the following steps:
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Plugins > Python console
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Copy and Paste this python code and Run command
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Restart QGIS

Sources
https://opengislab.com/blog/2018/4/15/add-basemaps-in-qgis-30