Most AI coding tools let you change the API base URL. That means you can point Claude Code, Cursor, Codex CLI, Cline and the official SDKs at a single gateway and manage one key and one balance instead of several.

Claude Code

Claude Code speaks the Anthropic Messages format. Set two environment variables:

export ANTHROPIC_BASE_URL="https://api.apivai.com"
export ANTHROPIC_AUTH_TOKEN="your-key"
claude

On Windows PowerShell:

$env:ANTHROPIC_BASE_URL = "https://api.apivai.com"
$env:ANTHROPIC_AUTH_TOKEN = "your-key"
claude

Cursor

Settings → Models → API Keys: turn on Override OpenAI Base URL, enter https://api.apivai.com/v1, paste your key, then add the model IDs you want (for example claude-sonnet-4-6).

OpenAI SDK (Python)

from openai import OpenAI

client = OpenAI(api_key="your-key", base_url="https://api.apivai.com/v1")
r = client.chat.completions.create(
    model="claude-sonnet-4-6",
    messages=[{"role": "user", "content": "Hello"}],
)
print(r.choices[0].message.content)

Common errors

• 401: the key is wrong, or it was sent in the wrong header. Use x-api-key or Authorization: Bearer.
• 404: usually a /v1 mismatch. Anthropic-format tools use the root URL, OpenAI-format tools need /v1.
• 429: the default limit is 60 requests per minute per key.

What it costs

At the time of writing, Claude models on APIVAI are 56–62% below Anthropic's list prices and GPT models up to 86% below OpenAI's. For example, Claude Sonnet 4.6 is \(1.15 / \)5.74 per million input / output tokens against the official \(3 / \)15. It's prepaid and pay-per-token, with no subscription. The full table is at https://apivai.com/pricing.

Setup guides for Cline, Roo Code, Aider, Continue, Open WebUI and others are on the blog: https://apivai.com/blog

Questions are welcome in the comments.