In this essay, the causal structure of spacetime is critically examined with a focus on its foundational aspects. The author argues that traditional formulations of the causal order in spacetime often rely on assumptions that may lead to infinite causal regress. To address this, a well-founded causal relation is proposed, in which causation is understood not as a temporal or sequential mechanism but as a grounding relation among events. The analysis suggests that spacetime emerges from a more fundamental layer of reality characterized by ontological priority rather than mere temporal succession. The conclusion posits that the causal structure of spacetime must be well-founded to avoid logical inconsistencies and that this foundation lies beyond spacetime itself, potentially in a network of basal events. This ontological perspective has implications for the interpretation of physical theories and the nature of reality