// Software stack
Multi-model gateway
One API to switch models, fail over and control cost.
3 pieces4 setup stepsscenario: Control AI costs and usage limits
What goes in it
- 1
OpenRouter Model gateways, routing & usage Closed / commercial
Gateway
Unified API gateway to hundreds of models with pay-as-you-go billing.
Or: OmniRoute · llm-gateway · axonhub · experiential · fal
- 2 ★ 39k
freellmapi Model gateways, routing & usage Open source
Free aggregator
OpenAI-compatible proxy stacking free tiers of 16 LLM providers.
Or: free-claude-code
- 3 ★ 5.0k
langwatch Observability & tracing Open source
Usage tracking
Open-source agent observability and evals.
Or: latitude-llm
How to set it up
- 01Standardise on the OpenAI-compatible API
- 02Configure routing and budgets
- 03Log tokens and error codes
- 04Give agents read-only keys
Similar stacks: what’s different
- Model gateway & cost controlThat one gives the full budget, rate-limit and fallback setup