> ## Documentation Index
> Fetch the complete documentation index at: https://cantonfoundation-splice-openapi-manual-pages-preview.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Retrieve transactions and synchronizer reassignments prior to the request's specification

<div class="x2mdx-ref-page x2mdx-ref-page--operation x2mdx-ref-page--manual-api" />

<div class="x2mdx-ref-hero">
  <p class="x2mdx-ref-eyebrow">Scan API</p>

  <h1 class="x2mdx-ref-title">Retrieve transactions and synchronizer reassignments prior to the request's specification</h1>

  <div class="x2mdx-ref-badges">
    <span class="x2mdx-ref-badge x2mdx-ref-badge--protocol">OpenAPI</span>

    <span class="x2mdx-ref-badge x2mdx-ref-badge--added">Since 0.5.10</span>

    <span class="x2mdx-ref-badge x2mdx-ref-badge--changed">Changed 0.6.0</span>
  </div>
</div>

Retrieve transactions and synchronizer reassignments prior to the request's specification.

## Protocol Details

<div class="x2mdx-ref-meta-grid">
  <div class="x2mdx-ref-meta-item">
    <span class="x2mdx-ref-meta-label">Operation ID</span>
    <span class="x2mdx-ref-meta-value">getUpdatesBefore</span>
  </div>

  <div class="x2mdx-ref-meta-item">
    <span class="x2mdx-ref-meta-label">Published</span>
    <span class="x2mdx-ref-meta-value">0.7.4</span>
  </div>

  <div class="x2mdx-ref-meta-item">
    <span class="x2mdx-ref-meta-label">Specification</span>
    <span class="x2mdx-ref-meta-value"><a href="/openapi/splice/scan/scan.yaml">Download OpenAPI</a></span>
  </div>
</div>

## Inputs

### Request body

<div class="x2mdx-ref-badges">
  <span class="x2mdx-ref-badge x2mdx-ref-badge--neutral">application/json</span>
</div>

<ParamField body="migration_id" type="number" required>
  OpenAPI type: `integer (int64)`.
</ParamField>

<ParamField body="synchronizer_id" type="string" required />

<ParamField body="before" type="string" required>
  OpenAPI type: `string (date-time)`.

  Only return updates with a record time strictly smaller than this time.
</ParamField>

<ParamField body="at_or_after" type="string">
  OpenAPI type: `string (date-time)`.

  Only return updates with a record time equal to or greater than this time.
</ParamField>

<ParamField body="count" type="number" required>
  OpenAPI type: `integer (int32)`.

  Return at most this many updates. The actual number of updates returned may be smaller.
</ParamField>

## Outputs

### 200

<div class="x2mdx-ref-badges">
  <span class="x2mdx-ref-badge x2mdx-ref-badge--neutral">application/json</span>
</div>

<ResponseField name="transactions" type="UpdateHistoryItem[]" required />

### 404

<div class="x2mdx-ref-badges">
  <span class="x2mdx-ref-badge x2mdx-ref-badge--neutral">application/json</span>
</div>

<ResponseField name="error" type="string" required />

## History

<div class="x2mdx-ref-history" aria-label="Reference history">
  <div class="x2mdx-ref-history-event x2mdx-ref-history-event--changed">
    <div class="x2mdx-ref-history-event-head">
      <span class="x2mdx-ref-history-event-label">Changed</span>
      <code class="x2mdx-ref-history-event-version">0.6.0</code>
    </div>

    <p class="x2mdx-ref-history-event-detail">The POST /v0/backfilling/updates-before operation changed in this snapshot.</p>
  </div>

  <div class="x2mdx-ref-history-event x2mdx-ref-history-event--changed">
    <div class="x2mdx-ref-history-event-head">
      <span class="x2mdx-ref-history-event-label">Changed</span>
      <code class="x2mdx-ref-history-event-version">0.5.17</code>
    </div>

    <p class="x2mdx-ref-history-event-detail">The POST /v0/backfilling/updates-before operation changed in this snapshot.</p>
  </div>

  <div class="x2mdx-ref-history-event x2mdx-ref-history-event--introduced">
    <div class="x2mdx-ref-history-event-head">
      <span class="x2mdx-ref-history-event-label">Introduced</span>
      <code class="x2mdx-ref-history-event-version">0.5.10</code>
    </div>
  </div>
</div>

<RequestExample>
  ```bash Request theme={null}
  curl --request POST \
    --url 'https://scan.sv-1.global.canton.network.sync.global/api/scan/v0/backfilling/updates-before' \
    --header 'Content-Type: application/json' \
    --data '{"migration_id":0,"synchronizer_id":"string","before":"2026-01-01T00:00:00Z","at_or_after":"2026-01-01T00:00:00Z","count":0}'
  ```
</RequestExample>

<ResponseExample>
  ```json 200 response theme={null}
  {
    "transactions": [
      {}
    ]
  }
  ```
</ResponseExample>