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Best tools·AI Gateways & Routers·Tool Use / Function Calling

Best AI Gateways & Routers for Tool Use / Function Calling

5 AI Gateways & Routers tools ranked by GitHub activity, community traction, and use‑case match — as of 2026-06-01.

Ranked by signal score (GitHub stars × 0.5 + PH votes × 0.3 + use-case tag match × 0.2). Data as of 2026-06-01. How we rank →

5 tools

  1. 01

    open-webui

    mcpo

    A simple, secure MCP-to-OpenAPI proxy server

    4,231
    AI Gateways & RoutersWebsite →
  2. 02

    archestra-ai

    archestra

    Enterprise AI Platform with guardrails, MCP registry, gateway & orchestrator

    3,759
    AI Gateways & RoutersWebsite →
  3. 03

    metatool-ai

    metamcp

    MCP Aggregator, Orchestrator, Middleware, Gateway in one docker

    2,363
    AI Gateways & RoutersWebsite →
  4. 04
    AM

    AmoyLab

    Unla

    🧩 MCP Gateway - A lightweight gateway service that instantly transforms existing MCP Servers and APIs into MCP servers with zero code changes. Features Docker deployment and management UI, requiring no infrastructure modifications.

    2,127
    AI Gateways & Routers
  5. 05

    samanhappy

    mcphub

    A unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies

    2,118
    AI Gateways & RoutersWebsite →

How we chose

Signal score weights: GitHub stars (50%), ProductHunt votes (30%), use-case tag match (20%). Minimum 4 qualifying tools per page. Only tools in published state with ≥80% data completeness included.

Full methodology →

Related

Questions

What is the best AI Gateways & Routers tool for Tool Use / Function Calling?
Based on signal score, mcpo leads this list with 4,231 GitHub stars. It is categorized under AI Gateways & Routers.
How do these AI Gateways & Routers tools compare on price?
Pricing data is incomplete for this set. See individual tool pages for current pricing.
Which of these tools works best with Tool Use / Function Calling?
Tools with the highest use-case tag match for Tool Use / Function Calling in this list: mcpo, archestra, metamcp. Use-case match is one of three signals in our ranking; see the methodology link above for how it's weighted.
Are there open-source options in this list?
mcpo (MIT), archestra (AGPL-3.0), metamcp (MIT), Unla (MIT), mcphub (Apache-2.0).
How often is this list updated?
GitHub stats refresh weekly. ProductHunt votes refresh weekly. Pricing data refreshes daily. This page last verified 2026-06-01.