---
ref: tool:segment/associate-user-with-group
name: Associate a user with a group
company: company:segment
workflows: []
access: [api]
tags: [capability:track-events, category:cdp, has:api]
docs: https://www.twilio.com/docs/segment/connections/sources/catalog/libraries/server/http-api#group
updated: 2026-09-27
---

# Associate a user with a group

Ties an identified user to a group, such as a company or account, and records the group's traits like industry and employee count.

## Set up

Use the first option your agent supports.

### API (official)

- Base URL: https://api.segment.io
- Endpoint: `POST /v1/group`
- Auth: send the header `Authorization: Basic $SEGMENT_API_KEY`
- Get a key: https://www.twilio.com/docs/segment/connections/find-writekey
- Docs: https://www.twilio.com/docs/segment/connections/sources/catalog/libraries/server/http-api

Note: `SEGMENT_API_KEY` holds the base64 of `<write key>:`. EU workspaces send to `https://events.eu1.segmentapis.com` instead.

Before anything else, confirm access with the cheapest read-only call, like a list or a search. Never send or change anything to test access.

## Rules

- Ask the user before anything that sends messages, costs money, or changes data, and say how many records it touches. One approval covers a batch the user has seen.
- Never print API keys.