Respan Gateway is a single Rust binary that sits between your code and AI APIs.
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Point an existing OpenAI, Anthropic or Gemini SDK at it and it can call any configured model, translating streaming, tools and reasoning, while also exposing MCP tools, traffic control and a live log of every request.
- 01
Cross-format translation between OpenAI Chat Completions/Responses, Anthropic Messages and Gemini APIs
- 02
MCP servers and built-in tools (search, browsing, code sandboxes, memory) usable from any chat request
- 03
Routing, fallback, retries and hedged requests across providers
- 04
Plugin system for guardrails, PII masking, pricing and custom logic
- 05
Live request log with cost, latency and tokens, plus optional tracing in Respan
Open Source
Self-hosted gateway is free and open source, dual-licensed MIT or Apache-2.0; Respan also offers a managed gateway and tracing platform.
Best for
Developers and platform teams building agents who want one self-hosted endpoint to swap models and providers without changing SDKs.
Not ideal for
Individuals who just want a hosted multi-model API with consolidated billing, or teams unwilling to operate their own gateway.
A fast, well-featured open-source AI gateway whose MCP tool support and API translation make it a solid fit for agent and developer tooling stacks.
Open-sourced in October 2026 with v0.1.0 and v0.2.0 releases, published on crates.io and PyPI, and launched on Hacker News.
As of
Is Respan Gateway free?+
Yes - Respan Gateway is Open Source. Self-hosted gateway is free and open source, dual-licensed MIT or Apache-2.0; Respan also offers a managed gateway and tracing platform.
Is Respan Gateway open source?+
Yes - Respan Gateway is open source. Self-hosted gateway is free and open source, dual-licensed MIT or Apache-2.0; Respan also offers a managed gateway and tracing platform.
Who is Respan Gateway best for?+
Developers and platform teams building agents who want one self-hosted endpoint to swap models and providers without changing SDKs.
Who is Respan Gateway not ideal for?+
Individuals who just want a hosted multi-model API with consolidated billing, or teams unwilling to operate their own gateway.
What are the best Respan Gateway alternatives?+
The closest Respan Gateway alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes Respan Gateway?+
Respan Gateway is developed by Respan (YC W24). It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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