Serotonin
Headquarters
Delaware United States
About us
Bringing the world's breakthrough technologies to market.
Founded in 2020 by Amanda Cassatt, Serotonin is a go-to-market firm that helps transformative technologies reach the market. With 90 people distributed across 15 countries, the company has supported over 300 clients in crypto infrastructure, digital assets, venture capital, AI, and consumer tech. The team provides end-to-end marketing solutions spanning public relations, growth marketing, content, research, social media, and design. At the center is the Serotonin Platform, which connects crypto builders and founders with essential resources for business growth. The company operates fully remote, bringing together former executives from ConsenSys, Chainlink, and other major tech companies.
Products
Beyond marketing services, Serotonin has built several products in the Web3 space. Spindl, a wallet-aware marketing analytics platform, was acquired by Coinbase. Mojito helps brands like Sotheby's and Mercedes use Web3 technology for customer retention and digital product sales. Franklin is a hybrid crypto-fiat payroll platform that uses stablecoins for faster, cheaper payments. The company also operates Serotonin Legal, providing corporate and regulatory advice to startups.
Funding
Serotonin appears to be bootstrapped with no publicly disclosed funding rounds. The company has grown organically through business development. In 2025, it acquired e-commerce agency Unparalleled to expand capabilities. In March 2026, Serotonin was acquired by Embryo, a Manchester-based digital marketing agency, though terms were not disclosed.
Recent news
On March 10, 2026, the Manchester-based digital marketing agency Embryo acquired Serotonin to bolster its creative and strategic service offerings, with Serotonin's founders, Clair Heaviside and Dom Carter, joining Embryo's leadership team as Chief Creative Officer and Chief Strategy Officer, respectively.
Technology
Marketing operations run on HubSpot for CRM, Notion for knowledge management, and Slack for communication. Workflow automation uses Make, Zapier, and n8n to connect systems. The AI infrastructure incorporates major LLMs, LangChain, and Retool for building internal tools. Teams work with APIs and JSON for custom integrations, plus the broader martech stack including native social platforms and AI creative tools.
Benefits
The team works fully remote across 15 countries with competitive, location-independent salaries. US employees get health insurance and 401(k) matching. Everyone gets unlimited PTO and parental leave. The culture emphasizes autonomy and work-life balance, with async-first collaboration across diverse teams. Leadership provides significant learning opportunities given their experience at major tech companies.