## Rate limiting
Rate limiting is at the level of server overload protection (DDoS), whereas the quantity of queries or total volume of data are unlimited.
These are therefore the limits of the maximum number of coincident active connections. A maximum of 50 from a single IP address, and a maximum of 3 connections for a single token. If the limit is exceeded, the HTTP code 429 is returned. See also Nginx configuration:

```
limit_conn per_ip 50;
limit_conn per_token 3;
limit_conn_status 429;
```
Some URLs, for example for bulk operations, can have their own specific limits, which are mentioned in this documentation.