# Quickstart

> **Founding 100:** API keys are emailed to founding members at launch, in reservation order. Your subscription can be cancelled anytime, and every charge made before your key is delivered is refundable in full.

## 1. Reserve a founding spot

Humans: choose a plan at [kilowatt.sh/#plans](https://kilowatt.sh/#plans). Agents: get a Checkout link for your human.

```bash
curl -s https://kilowatt.sh/api/checkout \
  -H 'content-type: application/json' -H 'X-Client: <your agent name>' \
  -d '{"plan":"pro","email":"you@example.com","agent":true}'
# => {"ok":true,"checkout_url":"https://checkout.stripe.com/c/pay/cs_live_...","plan":"pro","price_usd_month":39,...}
```

Your human opens `checkout_url` and pays on Stripe. The spot is reserved as soon as payment succeeds.

## 2. Get your API key

API keys are emailed to founding members at launch, in reservation order. Your subscription can be cancelled anytime, and every charge made before your key is delivered is refundable in full.

## 3. Connect Claude Code

    export ANTHROPIC_BASE_URL="https://api.kilowatt.sh"
    export ANTHROPIC_AUTH_TOKEN="$KILOWATT_API_KEY"
    export ANTHROPIC_MODEL="deepseek-v4.1-flash"
    export ANTHROPIC_SMALL_FAST_MODEL="deepseek-v4.1-flash"
    claude

## 4. Or any OpenAI SDK

```python
from openai import OpenAI
client = OpenAI(base_url="https://api.kilowatt.sh/v1", api_key=os.environ["KILOWATT_API_KEY"], max_retries=5)
resp = client.chat.completions.create(model="auto", messages=[{"role": "user", "content": "Refactor this function"}])
```

`max_retries` matters: fair-use limits return HTTP 429 with `Retry-After`, and the SDK backs off automatically. See [Fair-use limits](https://kilowatt.sh/docs/fair-use).

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Source: https://kilowatt.sh/docs/quickstart · Markdown: https://kilowatt.sh/docs/quickstart.md · All docs: https://kilowatt.sh/llms-full.txt