Degrades heparin and heparan sulfate. Also implicated in the release of heparin-bound growth factors from the extracellular matrix. Eliminative cleavage of polysaccharides containing (1->4)-linked D-glucuronate or L-iduronate residues and (1->4)-alpha-linked 2-sulfoamino-2-deoxy-6-sulfo-D-glucose residues to give oligosaccharides with terminal 4-deoxy-alpha-D-gluc-4-enuronosyl groups at their non-reducing ends. Monomer. By heparin. The N-terminus is blocked.