# Understand usage and limits

URL: https://aihio.ai/en/help/billing/usage\
Description: Check message credits and knowledge usage, and identify which limit has been reached.

Check usage before extensive testing or customer onboarding. Message credits, knowledge size and the number of agents measure different things.

Open billing for the correct workspace and select **Subscription**. Review the available usage indicators there. Compare each used amount with its own limit, not with another quota.

## What the indicators mean

| Indicator       | What to check                                                         |
| --------------- | --------------------------------------------------------------------- |
| Message credits | Usage, remaining amount and renewal shown in the view                 |
| Knowledge base  | Content usage relative to the workspace limit                         |
| Agents          | Created agents and the number allowed by the subscription             |
| Team            | Member count and included capacity, if member management is available |

Purchased extra credits may appear separately from the period's allowance. Check them separately. Current prices and limits are on [pricing](/en/pricing) and in the workspace subscription details.

## Testing also uses credits

The Editor preview uses real AI and message credits. Generating an instruction draft with AI can also use a credit even before you save that draft to the agent. Do not assume that every testing tool is free.

## When you reach a limit

1. Identify which limit the error message refers to.
2. Check the corresponding indicator and selected workspace.
3. If knowledge capacity is full, review duplicated or unnecessary content before adding sources.
4. If you need more capacity, review the available change and its cost in billing before confirming.
5. Retry the original task only after the new capacity appears or you have corrected the cause.

> **Note — Rate limiting is different from a period allowance:**
>
> Sending messages too quickly can produce a request to wait even when credits
> remain. Wait as instructed. Repeated submissions do not speed up recovery.

## If usage looks incorrect

Check the workspace, period and whether you are viewing the period allowance or extra credits. If the difference remains unexplained, [contact us](/en/contact#contact-form) with the indicator, expected amount and time of observation. Do not send customer conversations or payment information unnecessarily.
## Next steps

- [Manage your subscription](/en/help/billing/manage-subscription) — Review workspace billing, make a change and verify its status.