Read Last Entry Age

GET https://api.thingspeak.com/channels/12397/feeds/last_data_age.json

{
    "last_data_age": "174",
    "last_data_age_units": "s"
}

GET https://api.thingspeak.com/channels/12397/feeds/last_data_age.xml

<?xml version="1.0"?>
<feed>
  <last_data_age type="integer">174</last_data_age>
  <last_data_age_units type="string">s</last_data_age_units>
</feed>

GET https://api.thingspeak.com/channels/12397/feeds/last_data_age.csv

created_at,entry_id,field1,field2
2017-10-10 20:49:15 UTC,13031235,428,65.138004246284495
2017-10-10 20:49:28 UTC,13031236,442,66.496815286624198

GET https://api.thingspeak.com/channels/12397/feeds/last_data_age.txt

174