---
title: "CerteroX API"
canonical: "https://ai-docs.certero.com/space/CUP/118654329/CerteroX%20API"
format: markdown
---
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With the release of CerteroX v9, the API now supports both **READ** and **WRITE** functionality. The attached guide provides basic instruction on using the API. 

> ℹ️ **API capabilities by version**
> ℹ️ 
> ℹ️ What the API supports depends on your Certero version. Please check yours before integrating.
> ℹ️ 
> ℹ️ [Certero v9 onwards] **Read & write-back.** Everything in v8, plus write-back for User-Defined Fields (UDFs) and User-Defined Assets (UDAs) **only** — create and update them via the API.
> ℹ️ 
> ℹ️ [Certero v8] **Read-only.** Query and export data only. Nothing can be written back to Certero through the API.


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## Changelog

Updates to the Certero API and this guide. Most recent first.

| When | Version | Type | Change |
| --- | --- | --- | --- |
| June 2026 | Certero v9 | [New] | **Write-back API introduced.** The API can now create and update User-Defined Fields (UDFs) and User-Defined Assets (UDAs) — the only writable items; all other endpoints remain read-only. Part of the Certero v9 release, which also introduces new AI functionality and bug fixes. |
| 28th January 2022 | Certero v8 | [New] | Initial release of the read-only API alongside Certero v8. API guide published with authentication and basic usage instructions. |