Set Up Claude Code with MonoRouter

One command to install, one command to uninstall. Takes about 60 seconds.

What you need

• •A Claude Pro or Max subscription at claude.ai
• •Claude Code installed locally — npm i -g @anthropic-ai/claude-code (v2.1.129+ recommended for model discovery)
• •A MonoRouter account — sign up at /signup
• •A MonoRouter API key (mrk_*) — get one at /keys
• •Your Claude subscription connected to MonoRouter — go to /tokens, click [ + add token ], and run the auto-connect script

Sign up for MonoRouter

Open /signup, enter your email and set a password. Save the six recovery codes — they're your offline fallback if you lose your password; you can also always reset it by email at /forgot-password.

Connect your Claude subscription

From the dashboard, go to /tokens, click [ + add token ], and pick ANTHROPIC. Use the auto-connect tab — it's the fastest.

The modal shows a one-liner like this:

curl -sSL https://api.monorouter.dev/connect.sh | bash -s -- mrc_xxxxxxxxxxxx

Paste it into a terminal. The script runs claude setup-token, which opens a browser window for authorization and creates a long-lived token (valid for 1 year). When the dashboard flips to connected, you're done.

Install with one command

Replace mrk_your_key_here with your actual MonoRouter API key:

curl -sSL https://api.monorouter.dev/setup/claude-code.sh | bash -s -- install mrk_your_key_here

The script does three things:

• •Adds ANTHROPIC_BASE_URL, ANTHROPIC_API_KEY, and CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY to your shell config
• •Pre-approves the key in ~/.claude.json so Claude Code doesn't prompt you about it
• •Cleans up any existing Anthropic environment variables that might conflict

Verify it works

Open a new terminal, then run:

claude

Inside Claude Code, run /status — you should see https://api.monorouter.dev/apicompatible as the base URL. If you were previously logged in with an Anthropic account, run /logout first.

Or test with curl:

curl -X POST https://api.monorouter.dev/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: mrk_your_key_here" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 128,
    "messages": [{"role": "user", "content": "hi"}]
  }'

A 200 with a JSON response means you're done. The call also shows up on /dashboard within a second or two.

Model discovery

The setup script enables CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY, which tells Claude Code to probe MonoRouter's /v1/models endpoint at startup. All supported models — including Fable — appear in the /model picker labeled From gateway.

Uninstall

curl -sSL https://api.monorouter.dev/setup/claude-code.sh | bash -s -- uninstall

Removes the environment variables, revokes the key approval in ~/.claude.json, and cleans up stray exports. Open a new terminal, run claude, then /login to sign back in with your Anthropic account.

Update your key

If your MonoRouter key changes, just run install again with the new key:

curl -sSL https://api.monorouter.dev/setup/claude-code.sh | bash -s -- install mrk_new_key_here

Pricing

• •1,500 successful calls are free for the lifetime of your account. Failed calls don't count.
• •After that, paid plans start at $9/month (Hobby, 10,000 calls). Pro is $29/month for unlimited personal use; Team is $99/month for 5 pooled seats. See /billing for the payment flow.