# Expense Items
The expense items endpoint provides estimates for each of the measurements that consume your RIPE Atlas credits.
Note that you will have to replace the key search parameter in the URI with the UUID of a key that has been appointed the right permissions for this operation.
The items are grouped according to whether they are started by you or billed to you with your permission, and include links to the relevant locations in the measurements API.
NOTE
The daily cost estimates are based on the assumption that all of the probes participating in the measurement will generate the scheduled number of measurement results. In practice it is common for a small number of probes to be unresponsive over the course of a day, so this figure will sometimes be an over-estimate.