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Supergate: A Production-Grade Multi-Tenant API Gateway for Large Language Model Providers

Supergate is a unified multi-tenant API gateway that provides a single, stable API interface for LLM providers like OpenAI, Anthropic, and Google, with enterprise-grade features such as semantic caching, rate limiting, and cost attribution.

LLM网关API管理多租户语义缓存OpenAIFastifyPostgreSQLTypeScript
Published 2026-06-01 23:06Recent activity 2026-06-01 23:22Estimated read 4 min
Supergate: A Production-Grade Multi-Tenant API Gateway for Large Language Model Providers
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Section 01

Introduction / Main Floor: Supergate: A Production-Grade Multi-Tenant API Gateway for Large Language Model Providers

Supergate is a unified multi-tenant API gateway that provides a single, stable API interface for LLM providers like OpenAI, Anthropic, and Google, with enterprise-grade features such as semantic caching, rate limiting, and cost attribution.

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Section 03

Background and Problems

As large language models (LLMs) are increasingly used in enterprises, development teams face a common challenge: how to uniformly manage API access to multiple LLM providers. Different providers have different API formats, authentication methods, and billing models, which adds complexity to the operation and maintenance of production systems.

Supergate was born to address this—it sits in front of providers like OpenAI, Anthropic, Google, Cohere, and Mistral, providing teams with a stable, unified API and operational features required for production systems.


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Section 04

Core Features

Supergate offers a range of enterprise-grade features to address common pain points in LLM integration:

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Section 05

Unified API Interface

Regardless of the underlying provider, Supergate provides OpenAI-compatible endpoints. This means developers only need to learn one API format to flexibly switch or combine multiple LLM providers in the background.

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Section 06

Multi-Tenant Architecture

Tenant isolation is achieved via PostgreSQL's Row-Level Security (RLS). Each tenant has independent API keys, Role-Based Access Control (RBAC), and usage data. This design supports both simple scenarios for startups and compliance requirements for large enterprises.

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Section 07

Hybrid Key Management

Supports two key modes:

  • Gateway-hosted keys: Simplifies onboarding, ideal for quick starts
  • Bring Your Own Key (BYOK): Meets enterprise compliance needs; tenants manage their own provider API keys

BYOK keys are stored encrypted using AES-256-GCM to ensure security.

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Section 08

Semantic Caching

The cosine similarity cache based on pgvector is a key highlight of Supergate. When similar prompts are received, the system returns results directly from the cache without calling the underlying LLM. This brings two significant benefits:

  • Reduced latency: Cache responses are almost instantaneous
  • Cost savings: Avoids token costs from repeated calls