To be unobtrusive to your end-users, we’ll respond with a 200 OK status, even if some of these parameters are “incorrect”. The response will be a 1×1 GIF image (to power our “Beacon API”).

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Not to be confused with our URL API, which works with our JavaScript Library to tag links people use to reach your website.

Important: Since you are hitting a URL, remember that any special symbols like + and @ in your parameters should be URL-encoded.

Recording an Event

Method URL:

http://trk.kissmetrics.io/e
https://trk.kissmetrics.io/e

Parameters (GET or POST)

Parameters	Data Type	Required?	Description
_k	string	Yes	Your API key
_p	255 char string	Yes	Person doing the event
_n	URL-encoded string	Yes	Name of the event
_t	integer	optional	Timestamp in seconds after UTC Unix epoch. Note: you will also need to include `_d` option listed below for the timestamp to be applied.
_d	0 or 1	optional	Set to 1 if you’re manually passing us the timestamp. It’s used when logging events that occurred in the past.
(Anything)	URL-encoded string	optional	Set an arbitrary value to an arbitrary user property

Example

http://trk.kissmetrics.io/e?_k=api-key&_p=bob&_n=Signed+Up&gender=male&_t=1262304000&_d=1

This records that the user bob did the event Signed Up and his gender was male and this all happened on midnight of January 1, 2010 UTC.

Please be aware of how our processing servers detect duplicate events.

Setting Properties

Method URL:

http://trk.kissmetrics.io/s
https://trk.kissmetrics.io/s

Parameters (GET or POST)

Parameters	Data Type	Required?	Description
_k	string	Yes	Your API key
_p	255 char string	Yes	Person doing the event
(Anything)	URL-encoded string	optional	Set an arbitrary value to an arbitrary user property
_t	integer	optional	Timestamp in seconds after UTC Unix epoch
_d	0 or 1	optional	Set to 1 if you’re manually passing us the timestamp. It’s used when logging events that occurred in the past

Example

http://trk.kissmetrics.io/s?_k=api-key&_p=bob&gender=male&_t=1262304000&_d=1

This records that the user bob got the property gender with the value set to male and this happened on midnight of January 1, 2010 UTC.

Please be aware of how our processing servers detect duplicate properties.

Aliasing Users

Method URL:

http://trk.kissmetrics.io/a
https://trk.kissmetrics.io/a

Parameters (GET or POST)

Parameters	Data Type	Required?	Description
_k	string	Yes	Your API key
_p	255 char string	Yes	One of the person’s identities
_n	255 char string	Yes	Another of the person’s identities

Example

http://trk.kissmetrics.io/a?_k=api-key&_p=User+12345&_n=bob%40bob.com

This tells us that events done by User 12345 and events done by bob@bob.com were done by the same person. If you log events or properties to either ID, they all refer back to the same one person.

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Calling alias is not reversible, and should be used with some caution.

When to Alias

There are only a handful of scenarios where it is appropriate to directly call alias:

You implement Kissmetrics using more than one source of data: combining data from an external KM integration, server-side libraries, and/or our JavaScript library.
You are identifying people by their email address, and they update their email address within your app.
You change your tracking schema to identify people…say, from email address to username.

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Notes:

After calling alias, the new alias does not appear in a person’s list of Customer IDs unless the new alias has triggered an event or has properties set on it.

It’s fine to call alias more than once with the same pair of identities.

It’s natural if a person has more than one alias.

The order you pass the two arguments does not matter.