> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://apidocs.polytomic.com/2023-04-25/versioning/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://apidocs.polytomic.com/_mcp/server.

> **Polytomic Connect current version**
>
> `2025-09-18`

## Overview

The Polytomic Connect API is versioned. Version identifiers take the
form `YYYY-MM-DD` and match the release date — for example,
`2023-04-25`. Breaking changes produce a new version. Older versions
remain available for a period of time after a new release.

Requests that do not specify a version default to `2025-09-18`. Set a
version explicitly so new releases do not affect you.

## Specifying an API version

Set the `X-Polytomic-Version` request header to the version you want —
for example, `X-Polytomic-Version: 2025-09-18`.

```shell
curl --header "X-Polytomic-Version: 2025-09-18" \
     --header "Authorization: Bearer ${POLYTOMIC_API_KEY}" \
     https://app.polytomic.com/api/me
```

Every response includes an `X-Polytomic-Version` header indicating the
version that served the request.

## Supported versions

The currently supported versions are:

* `2025-09-18`
* `2024-02-08`
* `2023-04-25`
* `2022-12-12`
* `2021-05-23`