About
Prepaid GPT-5.5 credits for live apps.
X420.ai lets you buy GPT-5.5 API credit, create a capped API key, and use an OpenAI-compatible endpoint without exposing provider secrets in your app.
Quick summary
X420.ai sells prepaid GPT-5.5 API credit
X420.ai provides prepaid GPT-5.5 / ChatGPT API credits through an OpenAI-compatible proxy. It is built for developers and SaaS teams that want capped API keys, spending caps, and a familiar OpenAI SDK integration. X420.ai is not OpenAI.
- Category
- Prepaid AI API credits
- Audience
- Developers, founders, SaaS teams
- Endpoint
- https://api.x420.ai/v1
- Trust note
- Separate proxy and prepaid credit system
Updated 2026-06-04. Pricing and availability can change with partner surplus supply.
What you buy
A prepaid balance for GPT-5.5 API calls, delivered through X420 keys with optional spending caps.
What X420.ai is not
X420.ai is not OpenAI and does not replace your own direct provider relationship when you need one.
Pricing rule
Choose X€ before VAT, pay securely, and receive X×2€ of GPT-5.5 API credit when the pack is confirmed.
Availability
Prices, model access, and partner capacity can change. Last updated 2026-06-04.