Top API Gateways for AI Applications and Agentic Workflows (2026 Developer Guide)

A lot of AI apps die in the same place. Not during the prototype phase. Not while testing prompts. Not even during the “which model should we use?” debates. They break the moment real users start showing up. That’s usually when developers realize that calling an LLM directly from an app works fine right up until it suddenly doesn’t. One user accidentally burns through your token budget. Streaming responses start timing out. Your agent begins chaining 30 tool calls together, and debugging tu...