Management API
Management endpoints are rate-limited per project. When you exceed the limit, the API returns429 Too Many Requests with a Retry-After header when available.
| Tier | Approximate limit |
|---|---|
| Free / hackathon | 60 requests / minute |
| Pro | 300 requests / minute |
| Business | Custom |
Runtime broker
POST /v1/auth/token is limited to prevent credential stuffing. Cache resolved tokens client-side — the Skyline SDK refreshes at 80% of TTL automatically.
Messaging quotas
Separate from HTTP rate limits, iMessage lines enforce delivery quotas:- 5,000 messages per project per day (free tier)
- 50 new conversations per line per day
- 10 registered users per project (free tier)
Retry guidance
| Code | Action |
|---|---|
429 | Back off and retry with exponential delay |
5xx | Safe to retry with backoff |
401 | Do not retry — fix credentials |
422 | Do not retry — fix request body |