The Scenario
You are a growth engineer. Three months ago, your site ran a marketing campaign that used anonymous visitor IDs before signup. After signup, the platform assigned known user IDs. The alias calls that should have stitched those identities together were never sent to Segment.
Every acquisition cohort from that quarter shows as anonymous in Segment's funnel. Anonymous users do not get attributed to campaigns. The channel that drove 40% of signups looks like 0% in the attribution model.
You have an Excel workbook with 1,200 rows in the Identity Stitching tab — column A has the anonymous visitor ID, column B has the known user ID after account creation.
You need all 1,200 pairs aliased in Segment before the next attribution report.
The slow version:
- Write a script to call Segment's alias endpoint per row
- Handle auth, rate limits, retries
- Run it, find 40 rows erroring with no log to check
- Run it twice by accident, sending some alias calls in the wrong direction.
The fast version is one prompt.
The Easy Way: One Prompt in SheetXAI
SheetXAI reads the workbook and sends the alias calls, so you do not have to write the script.
Open the SheetXAI sidebar and type:
Send a Segment alias call for every row in the Identity Stitching tab using the anonymous ID from column A as the previous ID and the known user ID from column B as the new ID. Write DONE or ERROR into column C per row.
SheetXAI reads all 1,200 rows, calls Segment's alias endpoint for each pair, and writes result status back to column C.
What You Get
1,200 Segment alias calls with row-level status in column C:
- DONE for every pair Segment accepted
- ERROR for any row that failed, with the reason
- Full journeys stitched — pre-signup sessions now link to known user IDs in Segment's identity graph
The alias direction matters. SheetXAI sends the anonymous ID as previousId and the known user ID as userId, which is the correct direction for Segment's identity graph.
What If the Data Is Not Quite Ready
Identity stitching workbooks always have edge cases. SheetXAI handles them and the alias calls in the same prompt.
When some columns are swapped
A few rows have the known user ID in column A and the anonymous ID in column B.
For rows where column A starts with a numeric user prefix (e.g., "usr_") and column B looks like an anonymous visitor ID (starting with "anon_"), swap the columns before sending. For all other rows, use column A as previousId and column B as userId. Send a Segment alias call per row and write DONE or ERROR into column C.
When some pairs are duplicates
The export was pulled twice and some ID pairs appear twice in the tab.
Deduplicate the Identity Stitching tab by the combination of column A and column B, keeping one occurrence per unique pair. Then send a Segment alias call for each deduplicated pair using column A as previousId and column B as userId. Write DONE or ERROR into column C.
When you want to alias only pairs from the last quarter
You are fixing attribution for Q1 2026 only. Older pairs are out of scope.
Filter to rows where the known user ID in column B was created in Q1 2026 (look up creation date from the Users tab, column C). Send a Segment alias call for each matching pair using column A as previousId and column B as userId. Write DONE or ERROR into column C.
When you need deduplication, direction validation, and alias calls all in one pass
The workbook has duplicates, some columns are swapped, and some anonymous IDs are blank.
Remove any rows where column A is blank. For rows where the anonymous ID pattern (starting with "anon_") is in column B instead of column A, swap the columns. Deduplicate by the pair of column A and column B. Then send a Segment alias call for each remaining row using column A as previousId and column B as userId. Write DONE or ERROR into column C.
The pattern: the data cleanup and the API calls happen in one instruction.
Try It
Get the 7-day free trial of SheetXAI and open any workbook with anonymous-to-known ID pairs, then ask it to alias them in Segment. The Segment integration is included in every SheetXAI plan. For related workflows, see how to bulk-send historical identify calls from Excel or the Segment in Excel overview.