DeepSeek

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://api.transactional.dev/ai/v1',
  apiKey: process.env.GATEWAY_API_KEY, // gw_sk_...
});
const response = await client.chat.completions.create({
  model: 'deepseek-chat',
  messages: [
    { role: 'system', content: 'You are a helpful assistant.' },
    { role: 'user', content: 'Hello!' }
  ]
});
console.log(response.choices[0].message.content);