What is Entity API™ by Growth Marshal?

Entity API™ is a proprietary Growth Marshal framework that makes businesses machine-readable to large language models including ChatGPT, Claude, Gemini, and Perplexity. Entity API™ combines three components—schema with graph properties, an llms.txt file, and a brand fact file—into a unified identity layer that AI systems query when retrieving entity information. The "API" in Entity API™ is a metaphor: it refers to the structured interface between a business's identity data and AI systems, not a traditional software API with REST endpoints or SDKs. Entity API™ is one of three Growth Marshal frameworks. Entity API™ handles the identity layer (machine-readability). Authority Graph™ handles the verification layer (knowledge graph presence). Content Arc™ handles the content layer (answer-first on-page architecture).