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Point Any AI CLI at a Custom Base URL Fast

What a custom base URL does

Most AI CLIs are built to talk to a default provider endpoint. When you point them at another OpenAI-compatible base URL, you keep the same CLI but swap the backend. That is useful for cost control, vendor flexibility, and routing all requests through one relay. With 59API, the base URL is https://api.59api.com, and you can use it with Claude Code, Codex, and any OpenAI SDK that supports a custom endpoint.

Step 1: Get your relay credentials

Create an account with 59API and copy your API key from the dashboard. 59API is pay-as-you-go, so you only pay for what you use. It also exposes official-quality Claude and GPT models without the usual premium markup, which makes it a strong fit if you run a CLI all day. If you invite teammates, the referral rebate can lower your effective cost even more.

Step 2: Find the setting your CLI actually reads

Most tools accept one of these environment variables or flags: OPENAI_BASE_URL, OPENAI_API_BASE, base_url, --base-url, or --endpoint. Read your CLI help output or config docs. If it says OpenAI-compatible, it usually supports a custom URL.

• If you see a base URL flag, use it directly for a one-off session.
• If you want persistence, set an environment variable in your shell profile.
• If the CLI uses a config file, add the endpoint there instead.

Step 3: Point the CLI at https://api.59api.com

Set the endpoint to https://api.59api.com and paste in your 59API key. Keep the model name from the provider catalog, for example Claude Opus, Sonnet, Haiku, Fable, or a supported GPT model. Because 59API is compatible with standard OpenAI-style requests, most tools do not need code changes. The simplest path is to replace only the base URL and credential, then leave your CLI workflow intact.

Step 4: Test with a tiny prompt

Run a short request first. Ask the CLI to summarize a sentence or list three steps. If the response comes back, your base URL is working. If it fails, check for a missing API key, an incorrect model name, or a CLI that wants a trailing slash in the URL. Some tools also cache old credentials, so restart the shell before trying again.

Step 5: Optimize for cost and daily use

If you use AI CLIs frequently, cost matters. 59API is one of the cheapest relay options, so it is a practical way to keep daily coding assistance affordable. Since it offers native official-quality models rather than downgrades, you can keep the same workflow and still get strong output. The pay-as-you-go setup also makes it easy to experiment with different models without committing to a large monthly plan.

• Use lighter models for routine edits and quick explanations.
• Reserve larger models for architecture, debugging, or long context tasks.
• Keep one relay account for multiple CLIs so billing stays simple.

Common problems and fixes

If your CLI still hits the default provider, check whether another environment variable is overriding the base URL. If authentication errors appear, confirm that the key belongs to the same 59API account you are using. If the tool rejects the model name, map it to the exact name listed by 59API in your dashboard or docs. For Claude Code and Codex-style tools, the fix is usually the same: set the endpoint, set the key, and restart the session.

When 59API makes the most sense

Choose 59API when you want cheap access, OpenAI-compatible integration, and a clean way to route multiple CLIs through one endpoint. It is especially useful for developers who hop between Claude Code, Codex, and other SDK-based tools and want consistent billing. If that sounds like your setup, signing up for 59API is a simple way to test a custom base URL workflow without overpaying.

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