Show HN: Fastagent – Deploy a chat agent API to your own Cloud Run

An open-source project called Fastagent launched under the Apache 2.0 license, letting developers deploy a chat agent API to their own Google Cloud Run account by describing the agent to a coding tool such as Claude Code, Codex, Grok or Pi. Fastagent provisions a private HTTPS endpoint that streams replies and retains per-conversation memory, and restricts access to approved users via a single app-wide token; Railway deployment is supported but not yet verified live. The project does not include a chat website, user-level login, code execution, or payment for cloud and model usage, which remain the deployer's responsibility.

← Products https://evabench.dev/ Fastagent · open source Your coding agent builds it. Your cloud runs it. Describe the chat agent you want to your coding agent. It sets the app up, runs it on your machine, shows you exactly what will be uploaded, and deploys to your own cloud once you say yes. Who it's for For builders who want the agent, not the server work. You use a coding agent like Claude Code, Codex, Grok or Pi, and you want a chat agent that your own website, app or bot can talk to. Here is what people build with it. A support bot that answers questions about our return policy and looks up order status. Why teams use it Your agent, on your terms. You stay in control Your agent lives in your own cloud account, with your own keys. Your data stays yours, and so does the bill. Make it yours Say what your agent should do and what it can help with. Everything else is taken care of, so you can focus on the idea, not the setup. Safe from surprises Only people you approve can use it, so strangers can never run up your costs. Easy for your coding agent Every step is safe to repeat, and every problem comes with a plain fix, so nothing gets stuck. Straight answers What it does, and what it doesn't. - ✓Give you a private HTTPS address your apps can send messages to - ✓Stream replies and remember each conversation - ✓Deploy to Google Cloud Run, verified live - ✓Deploy to Railway, supported but not yet verified live - ✕Come with a chat website. It's an API for your own app - ✕Log in individual users. One token covers the whole app - ✕Write code or run commands. It's a chat agent, not a coding sandbox - ✕Pay for your cloud or model usage. Those bills are yours Paste one prompt. Ship a chat agent. Copy the starter prompt into Claude Code or Codex and describe your idea. Free and open source under Apache 2.0.