---
name: "tech-llm-gateway-quota-as-retryable"
title: "Quota errors may arrive as HTTP 400"
description: "Reseller budget errors buried in 400 should failover like 402/429"
type: "tech"
category: "gateway"
tags: ["tech", "llm", "gateway", "architecture"]
related: ["[[project-anyrouter]]", "[[tech-llm-gateway-byok-sibling]]", "[[tech-cloudflare-ai-gateway-transparent]]"]
---
Some upstreams return `budget_exceeded` as HTTP 400. Classify as retryable/failover, not terminal client error.

Also: zero-byte full timeouts are terminal per backend per request — don't burn identical retries. See [[project-anyrouter]].