AI API guides

Guides for GPT-5.5 API and OpenAI-compatible AI API access.

These pages answer the search intents developers use before choosing an AI API gateway: model access, OpenAI SDK compatibility, Codex CLI, Claude Code, quotas, RPM, VietQR/VNPay payment, and PayPal/Crypto via Telegram.

GPT-5.5 API in Vietnam

What developers should check before choosing a GPT-5.5 API route: SDK compatibility, quotas, RPM, model IDs, and payment.

OpenAI-compatible API Vietnam

How to evaluate an API gateway that works with the OpenAI SDK while supporting local payment and agent tooling.

AI API with VietQR payment

A practical checklist for teams that need AI API access without international cards or per-token billing surprises.