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Document API rate limits on Pricing & Limits page #315

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25 changes: 24 additions & 1 deletion info/pricing.mdx
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Expand Up @@ -80,7 +80,30 @@ Auth sessions are fast (typically 5-30 seconds each). Kernel monitors session he

## Rate limiting

Kernel enforces per-organization rate limits on API requests. When you exceed the rate limit, the API returns a `429 Too Many Requests` response with a `Retry-After` header indicating how many seconds to wait before retrying.
Kernel enforces per-organization rate limits on API requests to ensure platform stability. When you exceed the rate limit, the API returns a `429 Too Many Requests` response with a `Retry-After` header indicating how many seconds to wait before retrying.

### Rate limits by plan

| Plan | Requests per minute (burst) | Sustained rate |
| --- | --- | --- |
| Enterprise | 250 | ~4 req/sec |
| Start-Up | 100 | ~1.7 req/sec |
| Hobbyist | 25 | ~0.4 req/sec |
| Developer (free) | 10 | ~0.2 req/sec |

Rate limits use a token bucket algorithm. The burst capacity allows short spikes above the sustained rate, while the sustained rate determines the long-term throughput ceiling.

### Rate-limited endpoints

| Endpoint | Description |
| --- | --- |
| `POST /browsers` | Create a browser session |
| `POST /invocations` | Launch an app invocation |
| `POST /browsers/{id}/process/exec` | Execute a command synchronously |
| `POST /browsers/{id}/process/spawn` | Execute a command asynchronously |
| `POST /browsers/{id}/playwright/execute` | Execute Playwright code |

### Response headers

Rate-limited endpoints include these headers on every response:

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