Prepaid API keys are a simple way to keep AI costs predictable: top up once, spend per request, and never face a surprise monthly bill. They work well for multi-model projects where usage varies.

KeyoAPI is built around this model. A single prepaid key unlocks GPT-class, Claude-class, Gemini-class, DeepSeek and open-source models across text, image, voice and video APIs. You keep your OpenAI SDK, change the base URL, and pay transparent per-model rates starting at $0.01 per million tokens — no subscription, no minimum commitment.