I am working in Qgis and using their satellite map. In the Mapbox website the said that they are an "open source". Just for being sure: can I use their maps like OSM maps? Give them credit and use them in Fiverr? Tanks!
2 Answers
The source code is open source, but if you want to use their service, that comes with constraints. The easiest summary is the Pricing page.
Note that the underlying data is still OSM. There are lots of ways to consume that data, including a range of rendering and data query options.
I sent to the customer support this message 
The sent me this answer 
and a list of links.
I think that this answer is pretty clear.
The way to give Mapbox their credit is to go Properties in the Layers Panel 
and then to click on the "Place the credit..." bar 
The credit will shows on the right cornet of the map 
As the Mapbox answer is as good as it can get I think it will be a good reinforcement if some one alas will ask the same question and post one more "Yes" in this forum. Thanks
The link list from Mapbox:
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2Telling the rest of us that you want to use QGIS would have been worth putting in the question. Commented Jun 24, 2017 at 23:10
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You are right and I change the headline and the question Commented Jun 25, 2017 at 10:11