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

# Usage

> This month's probes and challenges against your plan.

<ParamField header="Authorization" type="string" required>
  `Bearer hrtc_sk_…`
</ParamField>

## Response

```json theme={"dark"}
{
  "api_version": "2",
  "plan": "signal",
  "period_start": "2026-09-01T00:00:00.000Z",
  "probes":     { "used": 10400, "limit": 10000, "overage": 400, "overage_usd": 1, "blocked": false },
  "challenges": { "used": 7,     "limit": 1000,  "overage": 0,   "overage_usd": 0, "blocked": false }
}
```

Counts are for the current UTC month. A probe counts when the sensor opens a session for your site. A challenge counts when a ceremony is minted, by this API or by the widget. `limit` is `null` on an unmetered plan. `blocked` is `true` only on Sandbox at its limit. See [pricing](/reference/pricing).


## Related topics

- [Dashboard, sites, and keys](/dashboard/dashboard-and-keys.md)
- [Pricing](/reference/pricing.md)