Linking Semrush as a source

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Alpha release

This source is currently in alpha. The interface and available tables may change.

The Semrush connector syncs Site Audit data from your Semrush projects into the PostHog data warehouse, so you can analyze SEO health alongside your product data.

Prerequisites

You need:

A Semrush account with an SEO Business subscription
A project with Site Audit enabled
A v3 API key from your Semrush profile
Sufficient API units (100 units per table request, plus 100 units for connection validation)

Adding a data source

In PostHog, go to the Sources tab of the data pipeline section.
Click + New source and click Link next to this source.
Enter your credentials (see Configuration below) and click Next.
Select the tables you want to sync, choose a sync method and frequency, then click Import.

Once the syncs are complete, you can start querying this data in PostHog.

When linking Semrush, you'll need:

API key (v3) – find it under API keys in your Semrush profile.
Project ID – the numeric project ID from your Semrush project URL. For example, if your project URL is https://www.semrush.com/projects/123456/site-audit/, the project ID is 123456.

API units

Semrush syncs consume your account's API units:

100 units per table request during syncing
100 units for connection validation
Retries (up to 3 attempts) can consume additional units

Sync modes

Each table can be synced in one of several modes, depending on what the source supports:

Webhook (when available) – the source pushes changes to PostHog in real time. Fastest freshness, lowest ongoing cost, and the only mode that reliably captures updates and deletes.
Incremental – only new or updated rows are synced on each run, using a cursor field (such as an updated_at timestamp). Cheaper than a full refresh, but deletes aren't captured.
Append only – new rows are appended using a cursor field; existing rows are never updated. Ideal for immutable, append-only tables like event logs.
Full refresh – the whole table is reloaded on every sync. Use it when a table has no reliable cursor or when you need deletions reflected.

See sync methods for a full explanation of how each mode works and how to choose between them.

All Semrush tables use full refresh syncing. The Semrush API doesn't expose pagination or server-side time filters, so each sync re-downloads all data.

Configuration

Option	Type	Required
`API key (v3)`	password	Yes
`Project ID`	text	Yes

Supported tables

Table	Description	Sync method	Incremental field	Primary key
`site_audit`	Summary of the latest Site Audit for the configured Semrush project.	Full refresh	—	—
`site_audit_snapshots`	Completed audit IDs and completion dates for the configured Semrush project.	Full refresh	—	—
`site_audit_issue_descriptions`	Issue descriptions for Site Audit reports.	Full refresh	—	—

Troubleshooting

Authentication failed

If you see "Semrush authentication failed," your API key is invalid or expired. Verify your v3 API key under API keys in your Semrush profile.

API access disabled

If you see "Semrush API access is disabled," check that:

Your Semrush account has an active SEO Business subscription
You have access to the configured project

API units exhausted

If you see "Semrush API units or request limits are exhausted," you need to add more API units to your Semrush account or wait for your limits to reset. Contact Semrush support for help.

Project not found

If you see "Semrush could not find this project," verify:

The project ID is correct (numeric only, from your project URL)
You have access to the project
Site Audit is enabled for the project

If your sync is failing or data looks wrong, see the Data warehouse troubleshooting guide. If that doesn't help, contact support – we're happy to help.