Global hunger levels have set new records in each of the last three years, outpacing aid budgets. Most households experiencing food insecurity crises are now in fragile states, making it difficult to support vulnerable, hard-to-reach populations without interference from oppressive governments and non-state actors. Despite growing interest in using digital payments for crisis response, there is limited causal evidence on their efficacy. This study shows that digital payments can address basic needs during a humanitarian crisis. This study conducted a randomized evaluation among very poor, mostly tech-illiterate, female-headed households in Afghanistan with digital transfers of $45 every two weeks for two months. Digital aid led to significant improvements in nutrition and in mental well-being. It finds high usage rates, no evidence of diversion by the Taliban despite rigorous checks, and that 80% of recipients would prefer digital aid rather than pay a 2.5% fee to receive aid in cash. Conservative assumptions put the cost of delivery under 7 cents per dollar, which is 10 cents per dollar less than the World Food Program’s global figure for cash-based humanitarian assistance. These savings could help reduce hunger without additional resources. Asked to predict our findings, policymakers and experts underestimated beneficiaries’ ability to use digital transfers and overestimated the likelihood of diversion and the costs of delivery. Such misperceptions might impede the adoption of new technologies during crises. These results highlight the potential for digital aid to complement existing approaches in supporting vulnerable populations during crises