What is an AI Gateway? Architecture, Routing & Failover

Overview #

An AI Gateway is a specialized reverse proxy and orchestration layer that sits between client applications and downstream AI model providers to manage routing, rate limiting, automated failover, telemetry, and zero-retention privacy.

Why Production Systems Require an AI Gateway #

Direct integration with individual AI model vendors creates brittle architectures vulnerable to provider outages, sudden rate-limit throttling (HTTP 429), and vendor lock-in. An AI gateway decouples your business logic from upstream AI infrastructure, giving engineering teams central control over model fallbacks, latency optimization, and credit allocation.

Core Architecture of the API100 Gateway #

The API100 gateway is engineered for sub-50ms proxy overhead. Key components include:
• Ephemeral Ingestion: Requests are parsed in volatile RAM without disk writes.
• Circuit Breakers: Automatic health checks monitor upstream provider latency and error spikes.
• Intelligent Failover: If an upstream provider returns 5xx or 429 status codes, the gateway transparently reroutes the prompt to an alternate provider.
• Streaming Passthrough: Server-Sent Events (SSE) are relayed chunk-by-chunk to eliminate buffering delays.

Zero-Retention Privacy Guarantee #

Enterprise compliance requires strict guarantees that proprietary code, customer queries, and healthcare information are not retained. API100 operates a zero-retention policy: prompts are never logged to persistent databases or used for upstream training.

Code Example: Testing Gateway Routing with cURL #

curl https://api.apihundred.com/v1/chat/completions \
  -H "Authorization: Bearer $API100_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [{"role": "user", "content": "Hello via Gateway!"}],
    "stream": true
  }'

Frequently Asked Questions #

Q: What is an AI Gateway?

An AI Gateway is a cloud infrastructure proxy that manages, routes, and optimizes requests sent from applications to artificial intelligence foundation models with unified billing and automatic failover.

Q: How does an AI gateway handle provider outages?

When an upstream provider experiences downtime, the gateway's circuit breaker detects failures and automatically routes the request to a redundant model or fallback provider with zero downtime to the client application.