LuisSearch

Tiers

Start with zero setup and move up as you need more throughput. All search limits use a sliding 60-second window and return 418 when exceeded.

Tier	Rate limit	AI (chat/build)	Caching	How to get it
Anonymous	20 req/min	12/min · 60/day	—	Nothing — just call the API.
Free key	120 req/min	12/min · 60/day	—	Register an API key and get it approved.
Account	300 req/min	30/min · 200/day	✓ Response caching	Create an account.
Plus	Unlimited	120/min · 5000/day	✓ Response caching	Granted manually by the admin.

Anonymous

20 req/min

Full search API
Images, video & audio
No caching

No key needed.

Free key

120 req/min

Everything in Anonymous
Query attribution in logs
No caching

Recommended

Account

300 req/min

Everything in Free
Response caching
X-Cache hit/miss header
Higher AI limits (30/min · 200/day)
Faster repeated queries

Create an account below.

Plus

∞ unlimited

Everything in Account
No per-minute cap
Highest AI limits (120/min · 5000/day)
Priority for heavy use

Granted by the admin.

What caching gives you

On the Account and Plus tiers, repeated identical queries are served from a short-lived server-side cache instead of re-running the full ranking:

Faster responses for popular or repeated queries.
An X-Cache: HIT / X-Cache: MISS response header tells you which path served the request.
Cached entries have a short TTL, so results stay fresh as the index grows.

Create an account

Make an account to unlock 300 requests/minute and response caching — the highest self-service tier. Use your account key on requests just like a free key:

Authorization: Bearer ls_your_key_here

Create your account →

Need more? See the API docs for full rate-limit and error behavior.