8-ID-E is dedicated to X-ray Photon Correlation Spectroscopy (XPCS) at large momentum transfers, i.e., Wide-Angle XPCS. WA-XPCS probes the structural fluctuation down to atomic scales with gapless coverage of characteristic times from μs to hours. The fluctuational dynamics can occur under both equilibrium and non-equilibrium conditions, as the dynamics can be driven by either thermal energy or external stimuli (electrical, optical, mechanical, etc.). Dynamic pathways of materials during synthesis or operation (in-situ/in-operando) provides physical insight beyond both static snapshots and spatial ensemble average, which can be used to characterize material properties and advise on material design. 8-ID-I applies XPCS to the study of equilibrium fluctuations and fluctuations about the evolution to equilibrium in soft matter in the small-angle scattering (SAXS) geometry. In collaboration with beamline staff, specialized SAXS applications such as pinhole geometry near ultra-SAXS (USAXS) or time-resolved (TR) SAXS are also performed. The beamline optics are optimized for stability, brilliance preservation, and minimal parasitic scattering. Rheo-SAXS-XPCS is offered to general users in collaboration with the Center of Nanoscale Materials (CNM) for the study of structure and dynamics of complex fluids under shear. This capability is based on an Anton-Paar MCR 702e rheometer with twin drive cylindrical Couette geometry.