> ## Documentation Index
> Fetch the complete documentation index at: https://docs.messari.io/llms.txt
> Use this file to discover all available pages before exploring further.

# API Tiers & Limits

> API access is structured according to your Messari subscription level.

* **Enterprise Users:** Enjoy unlimited access to the Market Data API endpoints. For access to additional API services such as News, Token Unlocks, Fundraising data or more, please contact [api@messari.io](mailto:api@messari.io) to discuss Enterprise options.
* **All Users with an API Key:** Have access to the MessariAI API (AI) chat completion endpoints

## **Rate Limit Structure**

The Messari API employs a two-tiered rate limiting system (see below).

### **Global Rate Limit**

Global rate limits apply to your overall API usage across all Messari services. These limits restrict the total number of requests you can make to our API within a specified time window, regardless of which specific endpoints you're accessing. Global limits help us manage overall system load and ensure equitable resource distribution among all users.

| **Subscription Level** | **Rate Limit**     | **Note**                                                                |
| :--------------------- | :----------------- | :---------------------------------------------------------------------- |
| Unpaid / Lite / Pro    | 200 requests / min | Assuming the endpoint to not be Enterprise-gated (small subset)         |
| Enterprise             | 600 requests / min | Assuming Enterprise team to have access to underlying service endpoints |

Note: It should be rare that you encounter these as they as established to prevent abuse.

### **Service-Level Rate Limits**

In addition to global limits, we implement service-specific rate limits that apply to individual API services or endpoint groups. These more granular limits are tailored to the computational intensity and resource requirements of the service.

These rate limits and their underlying subscription access tier are documented within each endpoint's documentation!

## MessariAI API Rate Limits

The MessariAI API has different rate limits based on your subscription tier. The table below shows the maximum number of requests allowed per day for each tier:

| Subscription Tier | Request Limit  |
| ----------------- | -------------- |
| Free              | 10 per day     |
| Enterprise        | 600 per minute |

These limits apply to the AI chat completion endpoints. If you need higher limits, please contact [api@messari.io](mailto:api@messari.io) to discuss buying a credit pack or see our [AI Credits System](#ai-credits-system) section below for more details.

## AI Credits System

The MessariAI API uses a credit system to track usage for Enterprise users who buy a credit pack. Each request consumes a certain number of credits, which are deducted from your account balance.