# Usage and access

The [API tiers page](https://collegebasketballdata.com/api-tiers) is the source
for current access levels, limits, and pricing. Those details can change, so
they are not duplicated here.

Playground requests count toward usage in the same way as requests from any
other client. Use the account and access information on
[CollegeBasketballData.com](https://collegebasketballdata.com) when you need to
review or change your access.

## Troubleshoot common responses

- `400` means the API could not accept the parameters or their combination.
  Review the operation requirements and correct the request.
- `401` means the request is not authorized. Confirm the bearer header and
  review [Authentication](/authentication).
- `404` means the resource or route was not found. Check the operation path and
  any identifiers in the request.
- A quota or entitlement response means the current account cannot complete
  that request. Check your usage and the current API tiers.
- `500` means the server could not complete a valid request. Retry later and
  contact support if the problem continues.

The playground shows the API's response status, headers, and body so you can
distinguish an API response from validation performed before a request is sent.