Migration infrastructures have usually been identified with stable sociomaterial arrangements controlling migration (e.g. airports and detention camps), stressing highly stratified power geometries and hierarchies. Recent debates about arrival infrastructures, however, have highlighted the informal, ephemeral and improvisational character of 'bottom-up' infrastructures. Departing from a widened understanding of infrastructure, this paper looks at migrants' businesses as urban infrastructures assembling various kinds of mobilities. In particular, we address small businesses established by Senegalese migrants in Brazil, and Brazilianowned cafés in Portugal. We approach these businesses as urban infrastructures where different forms of mobilities overlap and interact, exposing various trajectories and scales of circulation. While the businesses in Brazil cater mainly for Senegalese and other migrants' needs (money transfer, ICTs, and job offers), the Brazilian-owned coffee shops in Portugal function as sites of co-working and sociality of tourists, digital nomads, and other urban creatives. Building on ethnographic fieldwork in the cities of São Paulo and Caxias do Sul (Brazil) and in Lisbon (Portugal), this paper makes innovative connections between migration research, mobility studies and urban theory. We discuss the infrastructural production of transnational and local mobilities and how these businesses both result from and facilitate the existence of mobile lifestyles.