3. Use an OpenAI-compatible SDK

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.ROUTEMARKET_API_KEY,
  baseURL: "https://api.routemarket.ai/v1"
});

const completion = await client.chat.completions.create({
  model: "gpt-5.4",
  messages: [{ role: "user", content: "Explain RouteMarket in one sentence." }]
});

console.log(completion.choices[0]?.message?.content);