> ## Documentation Index > Fetch the complete documentation index at: https://dev-docs.altrum.ai/llms.txt > Use this file to discover all available pages before exploring further. # Budgets and rate limits > Cap spend and traffic for your organization, each AI system and each key. This is in development. Details may change before it is available. Altrum works out the cost of every request from the tokens the provider reports and a price list that Altrum keeps up to date every day. A model that is not on the list has no price, so its requests are recorded with no cost and do not count against a budget. Budgets cap that cost, and rate limits cap traffic. ## Where limits apply | Level | Set in | Applies to | | - | - | - | | Organization | **AI Gateway**, **Settings**, **Limits** | All gateway traffic in your organization | | AI system | The AI system's **AI Gateway** tab | All keys of that AI system | | Key | **Limits** when you create or edit the key | That key only | A request must pass every level that applies to it. Its cost counts against each of them. ## Budgets A budget is an amount in US dollars for a period: an hour, a day, a week or a month. When spending reaches the budget, further requests are refused until the period resets. A budget resets a set time after it started, or, when you choose calendar alignment, at midnight UTC for a day, on Monday for a week and on the first of the month for a month. Each organization, AI system and key has at most one budget in the dashboard. ## Rate limits A rate limit caps the number of requests, the number of tokens, or both, over a minute, an hour or a day. Requests over the limit are refused until the window resets. There is no default limit: a new organization has none until it sets one. ## What a caller sees A request refused by a budget says which budget is used up (the key, the AI system or the organization), how much was spent and when it resets. A request refused by a rate limit says which limit was reached. Both come back in the format of the API the caller used. Raise the limit and requests flow again within seconds. ## Personal keys Every personal key starts with the defaults an admin sets under **AI Gateway**, **Settings**, **Access**: a budget and a request limit. Admins can tighten any personal key. A personal key also counts against the organization's budget. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.