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

# Public endpoint

This API is a traffic-optimized endpoint to push data to AppSignal that is not sent through the [AppSignal agent](/appsignal/how-appsignal-operates#agent).

## Base URL

```shell Shell theme={null}
https://appsignal-endpoint.net
```

## Authentication

Authentication is done with a Public endpoint (or Front-end) API key, which can be found in [App settings](https://appsignal.com/redirect-to/app?to=info).

## URL Parameters

| Parameters | Type   | Description                                                                                           |
| ---------- | ------ | ----------------------------------------------------------------------------------------------------- |
| api\_key   | String | **Front-end** API key, can be found in [App settings](https://appsignal.com/redirect-to/app?to=info). |

Full example:

```shell Shell theme={null}
https://appsignal-endpoint.net/metrics/statsd?api_key=<api_key>
```

<Tip>
  **Note**: This endpoint is optimized for large amounts of traffic and does not
  validate the API key or payload, a `200` (`OK`) response is returned when the
  body size is within the `200k` limit. This doesn't mean the request is
  accepted when received.
</Tip>

## Endpoints

This API exposes the following endpoints:

* [StatsD Metrics](/api/public-endpoint/statsd) Send (batched) StatsD-formatted metrics to AppSignal.
* [JSON Metrics](/api/public-endpoint/json-metrics) Send (batched) JSON-formatted metrics to AppSignal.
* [Errors](/api/public-endpoint/errors) Send Errors to AppSignal.