Shape Security analyzes 1.5 billion logins per week and protects 350 million user accounts. In 2016 alone, 1.6 billion credentials were leaked and sold or traded by criminals on dark web markets. Shape uses headless browsers like PhantomJS to automatically test leaked credentials on other sites, stopping over $1 billion in fraud losses in 2016. However, captchas intended to prevent automated attacks do not work and ruin the user experience.