Rate limits and tiersReference

Your tier is earned by money paid in (net of refunds) and time since your first payment, never by spend.

Tier	Req/min per key	Req/min per account	Open streams	Monthly cap
Free	20	30	2	$10
Starter	60	120	5	$100
Build	300	600	20	$1,000
Scale	1,000	2,000	50	$5,000
Pro	3,000	6,000	100	$25,000
Enterprise	Custom	Custom	Custom	Custom

Tier	Unlock	Services	Batch size	Active keys
Free	Sign up	Models	None	3
Starter	$5 paid	Models, Search, Maps	10	10
Build	$50 paid and 7 days since your first payment	Models, Search, Maps, Mail	50	25
Scale	$250 paid and 14 days since your first payment	Models, Search, Maps, Mail	100	50
Pro	$1,000 paid and 30 days since your first payment	Models, Search, Maps, Mail	100	100
Enterprise	Contract with Kaer	All	Custom	Custom

Requests are counted in fixed 60-second windows, per key and per account; whichever runs out first answers 429 rate_limit_exceeded with Retry-After.
An edge gateway also caps each key at 12,000 requests a minute (bursts up to 2000), so the per-key limit is the lower of that and your tier's figure.
Open streams are counted per account; over the limit, 429 too_many_streams.
The monthly cap counts settled spend plus open holds in the calendar month (UTC). Your own budget in Settings can only lower it.
The dashboard playground has its own limit of 20 calls a minute.
Restricted accounts run at Free tier limits.

Mail caps are in Mail; top-up limits in Billing.