This ethnographic study examines how and why Detroit‐area credit‐constrained members of the urban poor relied on owners/employees of corner convenience stores, known as “party stores,” for accessing short‐term, interest‐free informal credit services. Findings indicate that informal credit at party stores functioned as a low‐ or no‐cost alternative to formal credit and high‐cost fringe banking services such as payday loans, both of which were inaccessible and/or cost prohibitive for informants. These data contribute empirically to a growing body of research on “credit invisibility” by exploring these populations' use of informal credit mechanisms. Findings also make a theoretical contribution by highlighting the importance of resource exchange networks through which members of the urban poor build strong yet disposable social ties in order to respond to economic shocks, combat food insufficiency, and survive economic destitution.