LLM Gateways APIs let you add llm gateways-powered capabilities without building from scratch. Every entry below is profiled with trust signals — pricing model, authentication requirements, CORS support, rate limits, and live uptime checks — so you can compare options and pick production-safe choices instead of guessing from a link list.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| Bifrost API Gateway Open-source self-hosted LLM gateway with fallbacks and observability. | Unknown | Unknown | Yes | Profile | |
| Cloudflare AI Gateway API AI application control-plane API for model routing, caching, observability, analytics, and provider management. | Freemium | API Key | No | Profile | |
| Helicone AI Gateway API OpenAI-compatible AI gateway and observability API for routing, logging, caching, analytics, and model usage tracking. | Freemium | API Key | No | Profile | |
| Inworld Router Single endpoint for 220+ LLMs with managed routing and realtime inference. | Unknown | Unknown | Yes | Profile | |
| Kong AI Gateway Govern AI traffic through the Kong API platform: routing, guardrails, observability. | Unknown | Unknown | Yes | Profile | |
| LangDB AI Gateway API OpenAI-compatible AI gateway API with model routing, thread management, analytics, and multi-provider access. | Freemium | API Key | No | Profile | |
| LiteLLM Proxy API OpenAI-compatible LLM proxy and gateway for routing requests across many model providers from one API surface. | Freemium | API Key | Unknown | Profile | |
| Lunar.dev API AI consumption management: virtual keys, quotas and spend control. | Unknown | Unknown | Yes | Profile | |
| Martian API Router Intelligent model router optimizing quality, cost and latency per request. | Unknown | Unknown | Yes | Profile | |
| Merge Gateway API Unified gateway API evaluated alongside Portkey and LiteLLM. | Unknown | Unknown | Yes | Profile | |
| OpenRouter API Access and route requests across many AI models and providers through one OpenAI-compatible API. | Freemium | API Key | Yes | Profile | |
| Portkey AI Gateway API Universal AI gateway API for routing, fallbacks, caching, guardrails, and observability across major model providers. | Freemium | API Key | No | Profile | |
| Requesty AI Router API OpenAI-compatible AI router for using many model providers with failover, load balancing, budgets, and team controls. | Freemium | API Key | No | Profile | |
| TrueFoundry AI Gateway Enterprise gateway: virtual models, RBAC, budgets and multi-strategy routing. | Unknown | Unknown | Yes | Profile | |
| Unify API LLM router benchmarking models to pick the best quality-per-cost route. | Unknown | Unknown | Yes | Profile | |
| Vercel AI Gateway API Unified AI model gateway for accessing many providers through AI SDK, OpenAI-compatible, Anthropic, and Responses-style APIs. | Freemium | API Key | No | Profile | |
| ngrok AI Gateway Managed routing across cloud and local models with failover and policy. | Unknown | Unknown | Yes | Profile |
Start with pricing and auth: free tiers and no-auth APIs are fastest to prototype with. Then check CORS if your app calls the API from the browser, and health before you commit — a great llm gateways API that's been down for a week will block your launch. Each profile below shows all of these signals plus rate limits where documented.