Change the api url and add a Helicone-Auth header
import anthropic
client = anthropic.Client(
    api_key="<Anthropic API Key>",
    base_url="https://anthropic.helicone.ai/v1"
)
res = client._request_as_json(
    "post",
    "v1/complete",
    params={
        "prompt": f"{anthropic.HUMAN_PROMPT} How many toes do dogs have?{anthropic.AI_PROMPT}",
        "stop_sequences": [anthropic.HUMAN_PROMPT],
        "model": "claude-v1",
        "max_tokens_to_sample": 300,
    },
    headers={
        "Helicone-Auth": "Bearer <HELICONE_API_KEY>"
    }
)