> ## Documentation Index
> Fetch the complete documentation index at: https://docs.struct.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Usage & Credits
> Understand how credits work, monitor your usage, and manage your plan
Struct uses a credit-based system. Every plan includes a monthly credit allowance, and you can purchase additional credits anytime.
***
## How Credits Work
Each investigation uses credits from your balance. The amount varies based on the complexity and duration of the investigation.
| Credit Type | Resets | Rolls Over |
| ---------------------------- | ------------------- | ----------------------------------- |
| **Monthly plan credits** | Every billing cycle | No — unused credits expire at reset |
| **Purchased top-up credits** | Never | Yes — roll over indefinitely |
Top-up credits are only consumed after your monthly allowance is used up. Purchase additional credits at any time from **Settings** → **Usage & Billing**.
***
## Monitoring Usage
Track your credit usage in **Settings** → **Usage & Billing**:
* **Credit balance** — See your current credits at a glance
* **Usage chart** — View daily credit consumption over the last 30 days
* **Reset date** — See when your monthly credits refresh
***
## Plans
Struct offers multiple plan tiers. Every plan includes monthly credits and access to all features. You can upgrade, downgrade, or add top-up credits at any time.
To view available plans or change your current plan, go to **Settings** → **Usage & Billing**.
The **Free** plan is a great way to get started. Upgrade when you need more credits or higher limits.
***
## Managing Billing
Click **Manage Billing** in **Settings** → **Usage & Billing** to:
* View invoices and payment history
* Update your payment method
* Manage your subscription
Need a custom plan or have billing questions? Reach out at [help@struct.ai](mailto:help@struct.ai).