API Throttling

Nyckel applies two independent limits to API traffic:

• Rate-limiting — a cap on requests-per-second (RPS). Currently 25 RPS.
• Concurrency throttling — a cap on the number of in-flight requests at any moment. Currently 25 concurrent requests.

Either limit triggers a 429 response. Both limits can be relaxed as part of an Enterprise plan — contact Nyckel if your workload needs higher headroom.