API Reference

Everstack REST API reference — OpenAI-compatible gateway and platform APIs.

Everstack exposes an OpenAI-compatible gateway API for LLM operations, plus platform APIs for agents, memory, workflows, functions, and more.

All endpoints are served on the same port (default 8089).

OpenAI-compatible endpoints live under /openai/v1 and take a standard Authorization: Bearer <key> header. The native REST surface under /v1 takes x-evs-api-key instead and will reject a Bearer token.

curl https://{instance}.{region}.everstack.ai/openai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-4o-mini", "messages": [{"role": "user", "content": "Hello"}]}'

Gateway

OpenAI-compatible endpoints — drop-in replacement for any OpenAI SDK.

Gateway API

Chat completions, embeddings, images, audio, moderations, and responses.

Platform

Agents API

Create and manage agents, sessions, and HITL approvals.

Workflows API

Workflow CRUD and execution management.

Memory API

Vector memory collections and semantic search.

Functions API

Isolated function management and execution.

Providers API

Configure and manage LLM provider integrations.

API Keys

Create, list, and revoke API keys.

MCP API

Model Context Protocol server management.

System

Config API

Runtime configuration management.

Auth API

Authentication, sessions, and user management.

Text-to-Speech: Generate audio from text

Text-to-Speech: Generate audio from text

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Gateway Platform System