The startup has developed a legal service model that replaces billable hours with fixed pricing and Slack-based communication for commercial agreements. Arceus raised $17 million in funding led by Greycroft, with participation from Craft Ventures and South Park Commons, to launch as an AI-native law firm. The firm uses software to handle the review, drafting, and negotiation of contracts such as NDAs and vendor agreements, with licensed attorneys providing final review of all work.

Average contract reviews take between 3 and 6 hours, utilizing AI to gather context and automate repetitive drafting and redlining tasks. Founder Mac Liu established the firm to resolve common business frustrations regarding the opacity and cost of traditional counsel. By selling legal outcomes through upfront flat fees, the company aims to reduce costs for clients and expand overall demand for professional legal services.