promethist

Empower Product LaunchRegister →
Promethist platform powering a use-case-specific orb call on iPhone
Platform · Relational Intelligence API

The API for agents that remember

Every session-based agent starts each conversation from zero, and users feel it. The Relational Intelligence API gives developers persistent memory, planning, and multimodal IO as composable primitives, so the agents you build compound understanding instead of resetting it.

< 100msp95 latency
10M+API calls daily
99.99%Uptime SLA
3 SDKsLanguage support
Overview

Why this matters

The challenges shaping this space, and where relational intelligence changes the outcome.

Composable intelligence

Memory, planning, and multimodal interaction ship as independent primitives you compose per use case. Adopt one capability or the full relational stack without re-architecting what you already run.

Developer-first

Typed SDKs in three languages, an interactive playground, and documentation written for the engineer who has to ship, not the analyst evaluating a slide.

Real-time processing

Sub-100ms p95 latency keeps voice and video inside natural conversational rhythm: the threshold where a digital human stops feeling like software.

Promethist platform web client running on desktop

Memory, planning, multimodal: composable

Relational capability is not one model call. It is memory that persists per relationship, planning that pursues goals across sessions, and IO spanning voice, video, and text, each exposed as a first-class primitive.

  • Persistent memory graph per relationship
  • Goal and task planning capabilities
  • Voice, video, and text in one API
Promethist orb call experience on iPhone

Build faster, ship sooner

The relational infrastructure that takes years to build in-house sits behind a clean interface. Your team starts from working primitives and spends its effort on the experience, not the plumbing.

  • SDKs for Python, TypeScript, Java
  • Interactive API playground
  • Comprehensive documentation and examples
Capabilities

Built for real-world impact

Memory graph API

Read and write the persistent relationship graph directly: what an agent knows about each individual, structured and queryable.

Conversation engine

Drive full multimodal dialogue from one endpoint, with turn management, interruption handling, and emotional context built in.

Multimodal pipeline

Stream voice, video, and text through a single pipeline that holds p95 latency under 100ms end to end.

Event webhooks

Subscribe to conversation milestones, sentiment shifts, and handoff triggers, routed into your own systems as they happen.

Promethist chat experience on iPhone
< 100msp95 latency
10M+API calls daily
99.99%Uptime SLA
3 SDKsLanguage support

Start building relational agents

Get API access and build agents with persistent memory, planning, and multimodal IO.