Node.js / TypeScript

npm install axios

import axios from 'axios';

const API_KEY = process.env.CHAT402_API_KEY;
const API_URL = 'https://api.chat402.xyz/api/v1';

async function chat(prompt: string, model = 'gpt-3.5-turbo') {
  try {
    const response = await axios.post(
      `${API_URL}/prompt`,
      { model, prompt },
      {
        headers: {
          'Authorization': `Bearer ${API_KEY}`,
          'Content-Type': 'application/json'
        }
      }
    );

    return {
      text: response.data.text,
      cost: response.data.cost.totalCost,
      tokens: response.data.usage.totalTokens
    };
  } catch (error) {
    if (error.response?.status === 402) {
      throw new Error('Insufficient balance');
    }
    throw error;
  }
}

// Usage
const result = await chat('What is Bitcoin?');
console.log(result.text);
console.log(`Cost: $${result.cost.toFixed(6)}`);