This Plasticity Language API extracts entities, relationships, and context from text using the Sapien Language Engine. This natural language understanding API is used for text analytics or for building conversational interfaces. It is a Human-like conversational interface to understand language at its core, that is based on language semantics, not keywords, that extracts relations, structure, and meaning from your text with a simple JSON API. Plasticity is built to extract a graph of real-world knowledge by understanding unstructured text on the internet, that employs inference, deduction, and distant supervision to uncover hidden knowledge. Plasticity synthesizes useful wide-ranging actions learned from natural language instructions.