Currently we offer free or individual API accounts. Free access is restricted in terms of the time series and resolutions that can be queried. Moreover, stricter limits apply and it is not possible to choose the time period for the values to be queried.

However, it is still possible to obtain complete, gapless time series if the requests are issued periodically within the limits.

For a summary of the current capabilities of your account, check out the overview.

If the free access does not meet your needs, please feel free to contact us.

POST or GET request method can be used via HTTPS only connection.

A security token must be included in every request. The prefered method is to include the token as authorization header.

Alternatively the token can be included as key value pair in the JSON object sent by the POST method.

{
    "token": "your-token"
}

Or via token url paramter using the GET method.

If exceeded, a corresponding message and error code 429 is returned. Limits apply to each account and metric individually.

The following example uses the curl command to POST a JSON object to the /help endpoint forcing a response in HTML format.

curl -i -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer your-token" \
  -d '{"format":"html"}' \
  https://api.gridradar.net/help

The API description below is the HTML response to this API call with some custom CSS style attached.

The default response format is JSON. The example below calls the /formats endpoint and does not use any parameters. The response is a JSON object containing all available response format keys and a corresponding description line.

import requests

url = 'https://api.gridradar.net/formats'

headers = {
  'Content-type': 'application/json', 
  'Authorization': 'Bearer your-token'
}

response = requests.post(url, headers=headers)
print(response.content)

{
  "columns":["response format","description"],
  "data":[
    ["json","Json object"],
    ["csv","Comma separated list"],
    ["xml","XML document"],
    ["html","HTML Table"]
  ]
}

Repeating the previous example but with the format parameter specified results in the following responses.

json_request = '{"format":"csv"}'
response = requests.post(url, data=json_request, headers=headers)

response format,description
json,Json object
csv,Comma separated list
xml,XML document
html,HTML Table

<table border="1" class="dataframe" id="formats">
  <thead>
    <tr style="text-align: right;">
      <th>response format</th>
      <th>description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>json</td>
      <td>Json object</td>
    </tr>
    <tr>
      <td>csv</td>
      <td>Comma separated list</td>
    </tr>
    <tr>
      <td>xml</td>
      <td>XML document</td>
    </tr>
    <tr>
      <td>html</td>
      <td>HTML Table</td>
    </tr>
  </tbody>
</table>

<?xml version='1.0' encoding='utf-8'?>
<data>
  <row>
    <response_format>json</response_format>
    <description>Json object</description>
  </row>
  <row>
    <response_format>csv</response_format>
    <description>Comma separated list</description>
  </row>
  <row>
    <response_format>xml</response_format>
    <description>XML document</description>
  </row>
  <row>
    <response_format>html</response_format>
    <description>HTML Table</description>
  </row>
</data>

Free users currently have permissions to call the /query endpoint using the metric keys frequency-ucte-median-1s and net-time without the time range arguments from and to. The start timestamp is calculated based on the timestamp of the last value in the previous query response. The maximum time range a response may contain is one hour.

{
  "metric":"frequency-ucte-median-1s"
}

The example above is the short form of the next request JSON object.

{
  "metric":"frequency-ucte-median-1s",
  "format":"json",
  "ts":"rfc3339",
  "aggr": "1s"
}

The following curl command example returns the minimum frequency per minute

curl -i -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer your-token" \
  -d '{"metric":"frequency-ucte-median-1s", "func":"min", "aggr":"1m"}' \
  https://api.gridradar.net/query

{
  "metric":"net-time"
}

The net-time metric returns the deviation from UTC time in seconds. The previous example is the short form of the request below.

{
  "metric":"net-time",
  "format":"json",
  "ts":"rfc3339",
  "aggr":"1s",
  "fill":"none"
}

The next curl command uses the GET method to query the net time.

curl 'https://api.gridradar.net/query?token=your-token&metric=net-time'

Individual users have permission to query the /query endpoint with additional metric name keys, where the time range arguments from and to can also be used. For certain metrics it may be necessary to specify special arguments, such as pmus for the metrics frequency and phase-angle to define a selection of measuring stations. Depending on the agreement, access can be subject to different limitations. Accessibility of measurement stations can be extended from single locations, whole countries up to the complete network. The minimum query interval can be reduced to 3 seconds with a maximum resolution of 100ms.

#!/usr/bin/python3
import requests
import json
import pprint

## Request and header parameters
token = 'your-token'
url = 'https://api.gridradar.net/query'

headers = {
    'Content-type': 'application/json', 
    'Authorization': 'Bearer '+token
}

## API query parameters
request = {
  "metric":"frequency",
  "pmus":"neustadt,dresden", 
  "from":"2021-05-26T02:36:17.3Z", 
  "to":"2021-05-26T02:36:17.6Z", 
  "aggr":"100ms", 
  "format":"json",
  "ts":"rfc3339"
}

## Converting the Python dictionary to a JSON string
json_request = json.dumps(request)

## Request execution and response reception
response = requests.post(url, data=json_request, headers=headers)

## Converting the JSON response string to a Python dictionary
result_dict = json.loads(response.content)

## Pretty print response dictionary
pprint.pprint(result_dict)

NOTE: The JSON response format of all endpoints is compatible with the Grafana JSON datasource plugins.

[
  {
    "target": "neustadt",
    "datapoints": [
      [ 49.9897, "2021-05-26 02:36:17.300" ], 
      [ 49.9893, "2021-05-26 02:36:17.400" ], 
      [ 49.9888, "2021-05-26 02:36:17.500" ], 
      [ 49.9887, "2021-05-26 02:36:17.600" ]
    ] 
  }, 
  {
    "target": "dresden",
    "datapoints": [
      [ 49.9921, "2021-05-26 02:36:17.300" ], 
      [ 49.9918, "2021-05-26 02:36:17.400" ], 
      [ 49.9906, "2021-05-26 02:36:17.500" ], 
      [ 49.9906, "2021-05-26 02:36:17.600" ]
    ]    
  }
]

{
  "columns":["code","msg"],
  "data":[
    [429,"Limitation: minimum request interval"]
  ]
}

If you require downsampling of the desired time series to a lower resolution, or if it's necessary to perform transformations or selections of particular values within a successive time range, a corresponding function must be specified via the func parameter. By default, the first selector function is used, which has no effect if the aggr parameter is set to the maximum resolution of the requested time series.

It's always a good idea to specify func and aggr parameters because the aggregation interval defaults to 1 second if the aggr parameter is not set and the maximum resolution of the specified time series may vary, (see the PREC [ms] column of the PMU tables).

curl 'https://api.gridradar.net/aggr_functions?token=your-token'

{
  "metric":"phase-angle",
  "pmus": ..., 
  ...
}

## e.g. returned timestamps of the selected values: 
## 2021-05-26 02:36:01.0, 
## 2021-05-26 02:36:02.0

{
  "metric":"frequency"
  "func":"mean", 
  "aggr":"1m"
  "pmus": ..., 
  ...
}

## e.g. returned timestamps of the result values: 
## 2021-05-26 02:36:00.0, 
## 2021-05-26 02:37:00.0

NOTE: The difference function always uses a nested mean function, which has no effect if the aggr parameter is set to the maximum resolution.

{
  "metric":"frequency"
  "func":"difference", 
  "aggr":"10s"
  "pmus": ..., 
  ...
}

## e.g. returned timestamps of the result values: 
## 2021-05-26 02:36:00.0, 
## 2021-05-26 02:36:10.0