---
title: "Get bucketing information for a visitor"
method: GET
path: "/attribution/{account_id}/visitor/{visitor_id}"
tags: ["Attribution"]
---

# Get bucketing information for a visitor

`GET /attribution/{account_id}/visitor/{visitor_id}`

Get a list of experiments within a project a visitor has been exposed to

## Path parameters

- `account_id` integer, required
- `visitor_id` string, required

## Query parameters

- `start_time` string, date-time
- `end_time` string, date-time

## Response `200`

Return bucketing information

- BucketingInformation
  - `account_id` integer — ID of the Account
  - `bucketing_history` BucketingInformationItem[] — Array of bucketing information items
    - `campaign_id` integer — The unique identifier of the Campaign
    - `experiment_id` integer — The unique identifier of the Experiment
    - `is_holdback` boolean — Is the visitor bucketed into a variation or a holdback
    - `timestamp` integer — The timestamp of the bucketing decision on the client side
    - `variation_id` integer — The unique identifier of the Variation
  - `visitor_id` string, uuid — The unique identifier of the visitor

## Other responses

- `401` — Invalid credentials
- `403` — You do not have permission to access bucketing history information
- `default` — Unexpected error

---

[API](https://skmtc.dev/optimizely/apis/optimizely-api.md) · [All operations](https://skmtc.dev/optimizely/apis/optimizely-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/optimizely/optimizely-api/revisions/5151fe6a2297/schema)