Probing a live GLM Coding Plan key showed the Anthropic-compat /v1/messages
response carries NO rate-limit headers. z.ai instead exposes a dedicated status
endpoint (found via github.com/rygel/AIUsageTracker):
GET https://api.z.ai/api/monitor/usage/quota/limit
Authorization: <raw key> (no "Bearer") Accept-Language: en-US,en
-> data.limits[] of TOKENS_LIMIT windows {percentage 0-100, nextResetTime ms, unit,number}
+ data.level (plan tier)
ZaiProvider now GETs that: the shortest TOKENS_LIMIT window -> the 5h bar (s/sr),
the longest -> the weekly bar (w/wr); the monthly TIME_LIMIT (web-tool quota) is
ignored; level -> status ("Lite"/"Pro"/…), any window at 100% -> "limited". It's
a status GET, so it does NOT spend the prompt-metered plan — no self-throttle
needed, polls on the normal cadence. Monitor URL derives from the configured
base host.
Verified live: s=1% (5h, resets ~4.9h), w=2% (weekly, resets ~6.5d), st="Lite".
test_zai rewritten for the JSON envelope (9 tests). probe_zai.py repointed to the
monitor endpoint. 122 passed, 2 Linux-only failures (baseline).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
