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

# Usage & Limits

> Pricing and connection limits for Uniblock WebSockets.

## Compute Unit (CU) costs

| Provider        | Activity               | CU Cost                  |
| --------------- | ---------------------- | ------------------------ |
| Alchemy         | Data Transfer          | 8,000 CUs per 0.1 MB     |
| Ankr            | Notification (EVM)     | 83.33 CUs                |
| Ankr            | Notification (Non-EVM) | 416.67 CUs               |
| Ankr            | Subscription (EVM)     | 416.67 CUs               |
| Ankr            | Subscription (Non-EVM) | 166.67 CUs               |
| CoinGecko       | Connection Setup       | 3,181.82 CUs             |
| CoinGecko       | Data Transfer          | 318.18 CUs per response  |
| Codex           | Data Transfer          | 3,500 CUs per response   |
| GoldRush        | Subscription           | 5,000 CUs per credit/min |
| Helius Enhanced | Connection Setup       | 50 CUs                   |
| Helius Enhanced | Data Transfer          | 150 CUs per 0.1 MB       |
| Helius Standard | Connection Setup       | 50 CUs                   |
| Hydromancer     | Data Transfer          | 1,667 CUs per 0.1 MB     |

## Connection limits

Concurrent connection limits are based on your subscription tier:

* `Startup`: 1
* `Growth`: 10
* `Pro`: 20
* `Business`: 30