HTTP API Source


The Segment HTTP Tracking API lets you record analytics data from any website or application. The requests hit Segment servers, Segment routes your data to any destination you want.

Segment has native sources for most use cases (like JavaScript and iOS) that are all built for high-performance and are open-source. But sometimes you may want to send to the HTTP API directly—that’s what this reference is for.

HTTP API sources in EU workspaces should use the `events.eu1.segmentapis.com` endpoint

If you are located in the EU and use the https://api.segment.io/v1/ endpoint, you might not see any errors, but your events will not appear in the Segment app. For more information about regional support, see the Source Regional support documentation.

Headers

Authentication

Choose between writeKey authentication, basic authentication and OAuth to authenticate requests.

writeKey authentication

Authenticate to the Tracking API by sending your project’s Write Key along with a request. The authentication writeKey should be sent as part of the body of the request. This will be encrypted over https.

  curl --location 'https://api.segment.io/v1/track' \
  --header 'Content-Type: application/json' \
  --data-raw '{
      "event": "happy-path-a3ef8a6f-0482-4694-bc4d-4afba03a0eab",
      "email": "test@example.org",
      "userId": "123",
      "writeKey": "DmBXIN4JnwqBnTqXccTF0wBnLXNQmFtk"
  }'

For this auth type, you do not need to set any authentication header.

Basic authentication

Basic authentication uses HTTP Basic Auth, which involves a username:password that is base64 encoded and prepended with the string Basic.

In practice that means taking a Segment source Write Key,'abc123', as the username, adding a colon, and then the password field is left empty. After base64 encoding 'abc123:' becomes 'YWJjMTIzOg=='; and this is passed in the authorization header like so: 'Authorization: Basic YWJjMTIzOg=='.

Include a colon before encoding. While encoding the write key without a colon might work due to backward compatibility, this won’t always be the case.

OAuth

Obtain the access token from the Authorization Server specific to the region.

Include the access token in the Authorization header as a Bearer token along with your project’s write key in the payload of the request. For example, Authorization with Bearer token looks like:

  Authorization: Bearer <access token>

For example, to use the access token in the HTTP API Source, use access_token in the header and write_key in the payload. An example cURL request looks like:

  curl --location 'https://api.segment.io/v1/track' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer <access token>' \
  --data-raw '{
      "event": "happy-path-a3ef8a6f-0482-4694-bc4d-4afba03a0eab",
      "email": "test@example.org",
      "messageId": "58524f3a-3b76-4eac-aa97-d88bccdf4f77",
      "userId": "123",
      "type": "track",
      "writeKey": "DmBXIN4JnwqBnTqXccTF0wBnLXNQmFtk"
  }

You can reuse the access token until the expiry period specified on the OAuth application.

Content-Type

To send data to Segment’s HTTP API, a content-type header must be set to 'application/json'.

Rate limits

For each workspace, Segment recommends you to not exceed 1,000 requests per second with the HTTP API. If you exceed this, Segment reserves the right to queue any additional events and process those at a rate that doesn’t exceed the limit. Requests that exceed acceptable limits may be rejected with HTTP Status Code 429. When Segment rejects the requests, the response header contains Retry-After and X-RateLimit-Reset headers, which contains the number of seconds after which you can retry the request.

To request a higher limit, contact Segment.

For batch requests, there’s a limit of 500 KB per request.

Engage rate limit

Engage has a limit of 1,000 events per second for inbound data. Visit the Engage Default Limits documentation to learn more.

Max request size

There is a maximum of 32KB per normal API request. The batch API endpoint accepts a maximum of 500KB per request, with a limit of 32KB per event in the batch. If you are sending data from a server source, Segment’s API responds with 400 Bad Request if these limits are exceeded.

Regional configuration

For Business plans with access to Regional Segment, you can use the host configuration parameter to send data to the desired region:

  1. Oregon (Default) — api.segment.io/
  2. Dublin — events.eu1.segmentapis.com/

Identify

Identify lets you tie a user to their actions and record traits about them. It includes a unique User ID and any optional traits you know about them.

Segment recommends calling Identify a single time when the user’s account is first created, and only identifying again later when their traits change.

Example Identify call:

POST https://api.segment.io/v1/identify
{
  "userId": "019mr8mf4r",
  "traits": {
    "email": "pgibbons@example.com",
    "name": "Peter Gibbons",
    "industry": "Technology"
  },
  "context": {
    "ip": "24.5.68.47"
  },
  "timestamp": "2012-12-02T00:30:08.276Z",
  "writeKey": "YOUR_WRITE_KEY"
}

This call is identifying the user by their unique User ID (the one you know them by in your database) and labeling them with email, name, and industry traits.

Field Type Description
anonymousId required; optional if userID is set instead String A pseudo-unique substitute for a User ID, for cases when you don’t have an absolutely unique identifier. A userId or an anonymousId is required. See the Identities docs for more details.
context optional Object Dictionary of extra information that provides useful context about a message, but is not directly related to the API call like ip address or locale See the Context field docs for more details.
integrations optional Object Dictionary of destinations to either enable or disable See the Destinations field docs for more details.
timestamp optional Date Timestamp when the message itself took place, defaulted to the current time by the Segment Tracking API, as a ISO-8601 format date string. If the event just happened, leave it out and we’ll use the server’s time. If you’re importing data from the past, make sure you to provide a timestamp.See the Timestamps fields docs for more detail.
traits optional Object Free-form dictionary of traits of the user, like email or name. See the Traits field docs for a list of reserved trait names.
userId required; optional if anonymousID is set instead String Unique identifier for the user in your database. A userId or an anonymousId is required. See the Identities docs for more details.

Find details on the identify method payload in the Segment Spec.

Track

Track lets you record the actions your users perform. Every action triggers an “event”, which can also have associated properties.

You’ll want to track events that are indicators of success for your site, like Signed Up, Item Purchased or Article Bookmarked.

To get started, try tracking just a few important events. You can always add more later.

Example Track call:

POST https://api.segment.io/v1/track
{
  "userId": "019mr8mf4r",
  "event": "Item Purchased",
  "properties": {
    "name": "Leap to Conclusions Mat",
    "revenue": 14.99
  },
  "context": {
    "ip": "24.5.68.47"
  },
  "timestamp": "2012-12-02T00:30:12.984Z",
  "writeKey": "YOUR_WRITE_KEY"
}

Track event properties can be anything you want to record. In this case, name and revenue.

The Track call has the following fields:

Field Type Description
anonymousId required; optional if userID is set instead String A pseudo-unique substitute for a User ID, for cases when you don’t have an absolutely unique identifier. A userId or an anonymousId is required. See the Identities docs for more details.
context optional Object Dictionary of extra information that provides useful context about a message, but is not directly related to the API call like ip address or locale See the Context field docs for more details.
event required String Name of the action that a user has performed. See the Event field docs for more details.
integrations optional Object Dictionary of destinations to either enable or disable See the Destinations field docs for more details.
properties optional Object Free-form dictionary of properties of the event, like revenue See the Properties docs for a list of reserved property names.
timestamp optional Date Timestamp when the message itself took place, defaulted to the current time by the Segment Tracking API, as a ISO-8601 format date string. If the event just happened, leave it out and we’ll use the server’s time. If you’re importing data from the past, make sure you to provide a timestamp.See the Timestamps fields docs for more detail.
userId required; optional if anonymousID is set instead String Unique identifier for the user in your database. A userId or an anonymousId is required. See the Identities docs for more details.

Find details on best practices in event naming as well as the Track method payload in the Segment Spec.

Page

The Page method lets you record page views on your website, along with optional extra information about the page being viewed.

Example Page call:

POST https://api.segment.io/v1/page
{
  "userId": "019mr8mf4r",
  "name": "Tracking HTTP API",
  "timestamp": "2012-12-02T00:31:29.738Z",
  "writeKey": "YOUR_WRITE_KEY"
}

The Page call has the following fields:

Field Type Description
anonymousId required; optional if userID is set instead String A pseudo-unique substitute for a User ID, for cases when you don’t have an absolutely unique identifier. A userId or an anonymousId is required. See the Identities docs for more details.
context optional Object Dictionary of extra information that provides useful context about a message, but is not directly related to the API call like ip address or locale See the Context field docs for more details.
integrations optional Object Dictionary of destinations to either enable or disable See the Destinations field docs for more details.
name optional String Name of the page For example, most sites have a “Signup” page that can be useful to tag, so you can see users as they move through your funnel.
properties optional Object Free-form dictionary of properties of the page, like url and referrer See the Properties field docs for a list of reserved property names.
timestamp optional Date Timestamp when the message itself took place, defaulted to the current time by the Segment Tracking API, as a ISO-8601 format date string. If the event just happened, leave it out and we’ll use the server’s time. If you’re importing data from the past, make sure you to provide a timestamp.See the Timestamps fields docs for more detail.
userId required; optional if anonymousID is set instead String Unique identifier for the user in your database. A userId or an anonymousId is required. See the Identities docs for more details.

Find details on the Page payload in the Segment Spec.

Screen

The Screen method let you record whenever a user sees a screen of your mobile app.

You’ll want to send the Screen message whenever a user requests a page of your app.

Example Screen call:

POST https://api.segment.io/v1/screen
{
  "userId": "019mr8mf4r",
  "name": "Tracking HTTP API",
  "timestamp": "2012-12-02T00:31:29.738Z",
  "writeKey": "YOUR_WRITE_KEY"
}

The Screen call has the following fields:

_
Field Type Description
anonymousId required; optional if userID is set instead String A pseudo-unique substitute for a User ID, for cases when you don’t have an absolutely unique identifier. A userId or an anonymousId is required. See the Identities docs for more details.
context optional Object Dictionary of extra information that provides useful context about a message, but is not directly related to the API call like ip address or locale See the Context field docs for more details.
integrations optional Object Dictionary of destinations to either enable or disable See the Destinations field docs for more details.
name optional String Name of the screen See the Name field docs for more details.
properties optional Object Free-form dictionary of properties of the screen, like name See the Properties field docs for a list of reserved property names.
timestamp optional Date Timestamp when the message itself took place, defaulted to the current time by the Segment Tracking API, as a ISO-8601 format date string. If the event just happened, leave it out and we’ll use the server’s time. If you’re importing data from the past, make sure you to provide a timestamp.See the Timestamps fields docs for more detail.
userId required; optional if anonymousID is set instead String Unique identifier for the user in your database. A userId or an anonymousId is required. See the Identities docs for more details.

Find details on the Screen payload in the Segment Spec.

Group

Group lets you associate an identified user with a group. A group could be a company, organization, account, project, or team. It also lets you record custom traits about the group, like industry or number of employees.

This is useful for tools like Intercom, Preact and Totango, as it ties the user to a group of other users.

Example Group call:

POST https://api.segment.io/v1/group
{
  "userId": "019mr8mf4r",
  "groupId": "8e9df332ac",
  "traits": {
    "name": "Initech",
    "industry": "Technology",
    "employees": 420
  },
  "timestamp": "2012-12-02T00:31:38.208Z",
  "writeKey": "YOUR_WRITE_KEY"
}

The Group call has the following fields:

Field Type Description
anonymousId required; optional if userID is set instead String A pseudo-unique substitute for a User ID, for cases when you don’t have an absolutely unique identifier. A userId or an anonymousId is required. See the Identities docs for more details.
context optional Object Dictionary of extra information that provides useful context about a message, but is not directly related to the API call like ip address or locale See the Context field docs for more details.
groupId required String A unique identifier for the group in your database. See the Group ID field docs for more detail.
integrations optional Object Dictionary of destinations to either enable or disable See the Destinations field docs for more details.
timestamp optional Date Timestamp when the message itself took place, defaulted to the current time by the Segment Tracking API, as a ISO-8601 format date string. If the event just happened, leave it out and we’ll use the server’s time. If you’re importing data from the past, make sure you to provide a timestamp.See the Timestamps fields docs for more detail.
traits optional Object Free-form dictionary of traits of the group, like email or name See the Traits field docs for a list of reserved trait names.
userId required; optional if anonymousID is set instead String Unique identifier for the user in your database. A userId or an anonymousId is required. See the Identities docs for more details.

Find more details about Group including the Group payload in the Segment Spec.

Alias

`Alias is how you associate one identity with another. This is an advanced method, but it is required to manage user identities successfully in some of Segment’s destinations.

In Mixpanel it’s used to associate an anonymous user with an identified user once they sign up. For Kissmetrics, if your user switches IDs, you can use ‘alias’ to rename the ‘userId’.

Example Alias call:

POST https://api.segment.io/v1/alias
{
  "previousId": "39239-239239-239239-23923",
  "userId": "019mr8mf4r",
  "timestamp": "2012-12-02T00:31:29.738Z",
  "writeKey": "YOUR_WRITE_KEY"
}

The Alias call has the following fields:

Field Type Description
context optional Object Dictionary of extra information that provides useful context about a message, but is not directly related to the API call like ip address or locale See the Context field docs for more details.
integrations optional Object Dictionary of destinations to either enable or disable See the Destinations field docs for more details.
previousId required String Previous unique identifier for the user See the Previous ID field docs for more details.
timestamp optional Date Timestamp when the message itself took place, defaulted to the current time by the Segment Tracking API, as a ISO-8601 format date string. If the event just happened, leave it out and we’ll use the server’s time. If you’re importing data from the past, make sure you to provide a timestamp.See the Timestamps fields docs for more detail.
userId required; optional if anonymousID is set instead String Unique identifier for the user in your database. A userId or an anonymousId is required. See the Identities docs for more details.

For more details on the Alias call and payload, see the Segment Spec.

Historical import

You can import historical data by adding the timestamp argument to any of your method calls. This can be helpful if you’ve just switched to Segment.

Historical imports can only be done into destinations that can accept historical timestamped data. Most analytics tools like Mixpanel, Amplitude, and Kissmetrics can handle that type of data just fine. One common destination that does not accept historical data is Google Analytics since their API cannot accept historical data.

If you’re tracking things that are happening right now, leave out the timestamp and Segment servers will timestamp the requests for you.

Batch

The batch method lets you send a series of Identify, Group, Track, Page and Screen requests in a single batch, saving on outbound requests. Segment’s server-side and mobile sources make use of this method automatically for higher performance.

There is a maximum of 500KB per batch request and 32KB per call.

HTTP Tracking API limits

Segment's HTTP Tracking API accepts batch requests up to 500KB. To avoid errors in event creation, ensure that individual event payload sizes remain below 32KB.

Here’s the what the batch request signature looks like:

POST https://api.segment.io/v1/batch
{
  "batch": [
    {
      "type": "identify",
      "userId": "019mr8mf4r",
      "traits": {
        "email": "jake@yahoo.com",
        "name": "Jake Peterson",
        "age": 26
      },
      "timestamp": "2012-12-02T00:30:08.276Z"
    },
    {
      "type": "track",
      "userId": "019mr8mf4r",
      "event": "Song Played",
      "properties": {
        "name": "Fallin for You",
        "artist": "Dierks Bentley"
      },
      "timestamp": "2012-12-02T00:30:12.984Z"
    },
    {
      "type": "identify",
      "userId": "971mj8mk7p",
      "traits": {
        "email": "cindy@example.com",
        "name": "Cindy Gonzalez",
        "age": 23
      },
      "timestamp": "2015-2-02T00:30:08.276Z"
    },
    {
      "type": "track",
      "userId": "971mj8mk7p",
      "event": "Song Played",
      "properties": {
        "name": "Get Right",
        "artist": "Jennifer Lopez"
      },
      "timestamp": "2015-2-02T00:30:12.984Z"
    }
  ],
  "writeKey": "YOUR_WRITE_KEY",
  "context": {
    "device": {
      "type": "phone",
      "name": "Apple iPhone 6"
    }
  }
}
Field Type Description
batch Array An array of Identify, Group, Track, Page and Screen method calls. Each call must have an type property with a valid method name.
context Object, optional The same as Context for other calls, but it will be merged with any context inside each of the items in the batch.
integrations Object, optional The same as Destinations for other calls, but it will be merged with any destinations inside each of the items in the batch.

Selecting Destinations

The Alias, Group, Identify, Page and Track calls can all be passed an object of integrations that lets you turn certain destinations on or off. By default all destinations are enabled.

Here’s an example showing an Identify call that only goes to Mixpanel and Kissmetrics:

POST https://api.segment.io/v1/identify
{
  "userId": "019mr8mf4r",
  "traits": {
    "email": "pgibbons@example.com",
    "name": "Peter Gibbons",
    "industry": "Technology"
  },
  "context": {
    "ip": "24.5.68.47"
  },
  "timestamp": "2012-12-02T00:30:08.276Z",
  "integrations": {
    "All": false,
    "Mixpanel": true,
    "Kissmetrics": true,
    "Google Analytics": false
  },
  "writeKey": "YOUR_WRITE_KEY"
}

'All': false says that no destination should be enabled unless otherwise specified. 'Mixpanel': true turns on Mixpanel, "Kissmetrics": true, turns on Kissmetrics, and so on.

Destination flags are case sensitive and match the destination’s name in the docs (for example, “AdLearn Open Platform”, “awe.sm”, “MailChimp”, and so on).

Note:

  • Available at the business level, filtering track calls can be done right from the Segment UI on your source schema page. Segment recommends using the UI if possible since it’s a much simpler way of managing your filters and can be updated with no code changes on your side.

  • If you are on a grandfathered plan, events sent server-side that are filtered through the Segment dashboard will still count towards your API usage.

Collecting IP Address

When sending a HTTP call from a user’s device, you can collect the IP address by setting context.direct to true.

Errors

Segment returns a 200 response for all API requests except errors caused by large payloads and JSON errors (which return 400 responses.) To debug events that return 200 responses but aren’t accepted by Segment, use the Segment Debugger.

Common reasons events are not accepted by Segment include:

  • Payload is too large: The HTTP API can handle API requests that are 32KB or smaller. The batch API endpoint accepts a maximum of 500KB per request, with a limit of 32KB per event in the batch. If these limits are exceeded, Segment returns a 400 Bad Request error.
  • Identifier is not present: The HTTP API requires that each payload has a userId and/or anonymousId. If you send events without either the userId or anonymousId, Segment’s tracking API responds with an no_user_anon_id error. Check the event payload and client instrumentation for more details.
  • Track event is missing name: All Track events sent to Segment must have an event field.
  • Deduplication: Segment deduplicates events using the messageId field, which is automatically added to all payloads coming into Segment. If you’re setting up the HTTP API yourself, ensure all events have unique messageId values with fewer than 100 characters.
  • Invalid JSON: If you send an event with invalid JSON, Segment returns a 400 Bad Request error.
  • Incorrect credentials: Double check your credentials for your downstream destinations.
  • Destination incompatibility: Make sure that the destination you are troubleshooting can accept server-side API calls. You can see compatibility information on the Destination comparison by category page and in the documentation for your specific destination.
  • Destination-specific requirements: Check the documentation specific to the destination to see if there are other requirements for using the method and destination that you’re trying to get working.

Segment welcomes feedback on API responses and error messages. Reach out to support with any requests or suggestions you may have.

Troubleshooting

No events in my debugger

  1. Double check that you’ve set up the library correctly.

  2. Make sure that you’re calling a Segment API method after the library is successfully installed—Identify, Track, and so on.

This page was last modified: 17 Oct 2024



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