# Fair use — Fluxx Open Exchange

Free, no signup, no key. To keep it that way for everyone:

- **60 requests / minute** and **5000 / day** per client (the RateLimit header reports whichever window has fewer requests left and RateLimit-Policy lists both; 429 carries Retry-After).
- **12 / minute** for the expensive tools (get_funder_profile, find_similar_organizations).
- Fluxx first-party servers carry a client key (`X-Exchange-Client-Key`) and are counted in their own bucket (600/minute, 50000/day, 120/minute expensive) instead of by address. The key is not authentication: every route stays public.
- **Page size ≤ 25**, **≤ 1000 records per query chain**. There is no bulk export; narrow the question instead.
- Every organization and award search needs a selective predicate. An award search by keyword alone (no funder or recipient EIN) may match at most **250,000 awards**; a broader keyword is refused with what to add.

If cost or abuse ever exceeds the envelope, the ladder is: tighten limits → free self-serve key → shed the most expensive tools. Charging users is not on the ladder.

Full policy: https://open.fluxx.io/fair-use