API Gateway GitHub Repositories (2026) · Open Source Tools

Next Generation Agentic Proxy for AI Agents and MCP servers

Open-source, high-performance AI gateway that works as your LLM gateway, MCP gateway and agent gateway. One OpenAI-compatible API for 10,000+ models, with failover, load balancing, semantic caching, virtual keys, budgets and MCP Code Mode. Works with any SDK or agent and adds under 200µs of overhead at 5k RPS.

🤖 AI Gateway | AI Native API Gateway

Open-source gateway that puts authorization in front of every action your AI agents, workflows and pipelines take, before it commits: payments, trades, price changes, deployments and API calls run once on a single-use grant, wait for a person, or are refused, as Decionis decides, with chained evidence. Homebrew, Linux, Docker, Helm.

Manages Unified Access to Generative AI Services built on Envoy Gateway

Turn CNB cloud-workspace in-network AI into production OpenAI & Anthropic (Claude Code) APIs. Zero deps, v5.2 self-healing HA, quota CLI.

The Cloud-Native API Gateway and AI Gateway

MCP Gateway is a reverse proxy and management layer for MCP servers, enabling scalable, session-aware stateful routing and lifecycle management of MCP servers in Kubernetes environments.

An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and management. Optimizes Agent & Tool calling, and supports plugins.

Apache ShenYu is a Java native API Gateway for service proxy, protocol conversion and API governance.

An API Gateway built on Spring Framework and Spring Boot providing routing and more.

Manages Envoy Proxy as a Standalone or Kubernetes-based Application Gateway

API Gateway bridging modern and legacy APIs with WSDL-to-OpenAPI, SOAP-to-REST, XML, OAuth2, and GraphQL.

A next-gen FOSS self-hosted unified zero trust secure access platform that can operate as a remote access VPN, a ZTNA platform, API/AI/MCP gateway, a PaaS, an ngrok-alternative and a homelab infrastructure.

Self-Hosted API Management for Builders

Welcome to the WSO2 API Manager source code! For info on working with the WSO2 API Manager repository and contributing code, click the link below.

KrakenD Community Edition: High-performance, stateless, declarative, API Gateway written in Go.

elastic inference for your agentic workloads

⚡️ Open-source AI Gateway — Use any SDK to call 100+ LLMs. Built-in failover, load balancing, cost control & end-to-end tracing.

open source Kubernetes-native API gateway for microservices built on the Envoy Proxy