You can run your own bring-your-own-key gateway with LiteLLM in minutes. Here's the setup, and when a managed BYOK gateway is the lower-effort path.
LiteLLM is an open-source proxy that accepts an OpenAI-compatible request and routes it to the provider whose key you configured. You bring the keys; it handles normalization and fallbacks.
model_list:
- model_name: gpt-4o-mini
litellm_params:
model: openai/gpt-4o-mini
api_key: os.environ[OPENAI_KEY]
- model_name: glm-4-flash
litellm_params:
model: zhipu/glm-4-flash
api_key: os.environ[ZHIPU_KEY]
Run it: litellm --config config.yaml --port 4000
. Point your client at http://localhost:4000
and your own keys flow through. Overhead is roughly 7.5ms per request — negligible.
| Self-host (LiteLLM) | Managed BYOK gateway | |
|---|---|---|
| Setup time | ~15 min | ~1 min (create virtual key) |
| Server to maintain | Yes (you) | No |
| Keys stored | Your server | Encrypted by operator |
| Failover across keys | You configure | Built-in |
| Cost | Infra only | Subscription / small platform fee |
If you don't want to keep a server online, patch it, and back up the key store, a managed BYOK gateway gives you the same "one endpoint, your keys, zero markup" model with none of the ops. You still pay the provider directly; the gateway only routes.
Create a virtual key with your provider key, use it in any OpenAI-compatible client, and the gateway handles routing and failover.