const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    model: 'anthropic/claude-sonnet-4',
    max_tokens: 512,
    stream: false,
    messages: [{role: 'user', content: 'What time is it in America/New_York right now?'}],
    tools: [{type: 'gateway:datetime', parameters: {timezone: 'America/New_York'}}],
    tool_choice: {type: 'auto'}
  })
};

fetch('https://api.phaseo.app/v1/messages', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "id": "<string>",
  "type": "<string>",
  "role": "assistant",
  "model": "<string>",
  "content": [
    {
      "text": "<string>",
      "cache_control": {
        "type": "<string>",
        "ttl": "<string>",
        "scope": "<string>"
      },
      "source": {
        "type": "<string>",
        "media_type": "<string>",
        "data": "<string>",
        "url": "<string>"
      },
      "id": "<string>",
      "name": "<string>",
      "input": {},
      "tool_use_id": "<string>",
      "content": "<string>"
    }
  ],
  "stop_reason": "<string>",
  "stop_sequence": "<string>",
  "usage": {
    "input_tokens": 123,
    "output_tokens": 123
  }
}