> ## Documentation Index
> Fetch the complete documentation index at: https://docs.oncarbon.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Plans and limits

> What the Free and Plus plans include and how event limits are enforced.

Plans are billed per space and metered by events ingested per month.

## Plans

|                            | Carbon Free          | Carbon Plus                 |
| -------------------------- | -------------------- | --------------------------- |
| Price                      | \$0                  | \$28 per month              |
| Included events            | 1,000 per month      | 100,000 per month           |
| Additional events          | Not supported        | \$0.00028 per event         |
| Usage period               | Calendar month (UTC) | Plan month (billing period) |
| LLM and tool call tracking | Included             | Included                    |
| All providers and SDKs     | Included             | Included                    |

## How limits are enforced

Usage counts events accepted into your space during the current usage period.

* **Free** — the usage period is the calendar month (UTC). Once the 1,000-event allowance is used, the ingest API rejects further batches with `402 usage_limit_exceeded` until the month resets — see [Delivery guarantees](/documentation/concepts/delivery). Rejected events do not appear in the dashboard and are not billed.
* **Plus** — the usage period is your plan month, the billing period that starts on your subscription date. The first 100,000 events per period are included; additional events are accepted and billed at \$0.00028 per event. If the subscription becomes inactive, the ingest API rejects batches with `402 billing_not_active` until billing is restored.

## Manage your plan

Upgrade, view usage, and manage payment from **Settings → Billing** in the dashboard. Upgrades take effect immediately; cancelling keeps Plus active until the end of the current billing period.