> ## Documentation Index
> Fetch the complete documentation index at: https://docs.interchange.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Get measurement source

> Read a single measurement source by ID

`GET /api/v2/buyer/advertisers/{advertiserId}/measurement-sources/{sourceId}`

Returns the full configuration for one measurement source.

## Request

<CodeGroup>
  ```bash curl theme={null}
  curl https://api.interchange.io/api/v2/buyer/advertisers/12345/measurement-sources/a1b2c3d4-e5f6-7890-abcd-ef1234567890 \
    -H "Authorization: Bearer $SCOPE3_API_KEY"
  ```
</CodeGroup>

## Parameters

| Field          | Type   | Required | Notes                                               |
| -------------- | ------ | -------- | --------------------------------------------------- |
| `advertiserId` | string | Yes      | Path parameter — the owning advertiser              |
| `sourceId`     | string | Yes      | Path parameter — the source ID returned at creation |

## Response

```json theme={null}
{
  "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "advertiserId": "12345",
  "sourceKey": "acme_incr_rev",
  "name": "Acme Incrementality",
  "outcomeType": "incremental_revenue",
  "outcomeTypes": [],
  "granularity": "geo_week",
  "cadence": "weekly",
  "provider": "acme-mmm",
  "lagWeeks": 1,
  "signalWeight": 1,
  "status": "active",
  "createdAt": "2026-01-15T10:30:00Z",
  "updatedAt": "2026-01-15T10:30:00Z"
}
```

## Errors

* `404 NOT_FOUND` — `sourceId` (or `advertiserId`) does not exist or is not visible to the authenticated account.

See [Errors](/v2/reference/errors) for the full error contract.

## Related

<CardGroup cols={2}>
  <Card title="Measurement tasks" href="/v2/buyer/measurement/tasks" icon="list-check">
    All measurement operations
  </Card>

  <Card title="Measurement overview" href="/v2/guides/measurement-incrementality" icon="chart-line">
    Pipeline, belief state, and concepts
  </Card>

  <Card title="Update measurement source" href="/v2/buyer/measurement/tasks/update-measurement-source" icon="pen">
    Change source settings
  </Card>
</CardGroup>