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X420.ai

OpenAI-compatible endpoint

Use GPT-5.5 through one X420 base URL.

Keep your OpenAI SDK, replace the base URL with https://api.x420.ai/v1, and authenticate with a capped X420 key funded by prepaid credit.

Integration

Replace the base URL and keep the OpenAI-style SDK

Keep the OpenAI SDK request format, set the base URL to https://api.x420.ai/v1, and authenticate with a capped X420 key funded by prepaid GPT-5.5 credit.

Base URL
https://api.x420.ai/v1
Model example
openai/gpt-5.5
Auth
Bearer X420 API key
Billing
Prepaid API credit

Updated 2026-06-04. Pricing and availability can change with partner surplus supply.

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://api.x420.ai/v1',
  apiKey: process.env.X420_API_KEY,
});

const response = await client.chat.completions.create({
  model: 'openai/gpt-5.5',
  messages: [{ role: 'user', content: 'Hello from X420.ai' }],
});