Product updates
All updates
Changelog
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Report Run API
Changelog
9/10/26
Report Run API
The Report Run API is now available to download report files: create a run for a company of any size, with webhooks to tell you when the files are ready. You can list your previous runs and attach your own identifiers in metadata. Payroll journal and payroll summary are available today, with new reports coming soon.
Product Announcement
09
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09
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26
Introducing Checkmate
Check's new AI agent is built on in-house AI foundations and runs directly on the Check API. It has access to more information, can take new actions, and reasons through harder questions for you and your team.

Product Announcement
9/9/26
Introducing Checkmate
Introducing our new AI agent, Checkmate! Checkmate is built on in-house AI foundations and runs directly on the Check API. It has access to more information, can take new actions, and reasons through harder questions for you and your team.
Checkmate is live in both Production and Sandbox. It keeps everything you used in CheckAI and adds new capabilities:
- Access to all of your data. New secure tooling lets Checkmate pull records across your data and run functions against them. Ask "What tax filings are blocked for this company?" and it reviews every filing before it answers.
- More complex questions. Checkmate chains searches across records. Ask why an employee's net pay changed on their last payroll, and it compares their paystubs line by line and walks you through what moved.
- Changes with a prompt. Expanded write access lets Checkmate create and update resources in Check for you, like setting up a new earning code with the right settings and taxability. It confirms every change with you before it's finalized.
Together, these mean Checkmate can resolve more of your questions than ever before.
The full Beta is free for all partners through March to help your teams get through Year End. Starting in Q2, day-to-day support and ops tasks stay free, and upgrade options will be available for heavier usage and extra capabilities.

Changelog
08
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20
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26
New Fulfillment ‘type’ for Unremittable Tax Refunds
Changelog
8/20/26
New Fulfillment ‘type’ for Unremittable Tax Refunds
Summaries of Unremittable Tax Refunds and their employer Tax Receipts are now created in the Fulfillments API with type = ‘unremittable_tax_refunds’. Please ensure any logic you have established around the Fulfillments API considers this new type, which is separate of ‘balancing’.
Changelog
08
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26
Webhook Delivery API
Changelog
8/13/26
Webhook Delivery API
The /webhook_deliveries API lets you review every webhook Check has sent you. Plus, you can now debug via API, Console, and MCP Server — no support ticket needed.
Read more in API docs.
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