> ## Documentation Index
> Fetch the complete documentation index at: https://api.onlysocial.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Connect your own systems to OnlySocial: publishing, the sales inbox, Link in Bio, webhooks, AI assistants and partner provisioning.

These docs cover everything you can automate in OnlySocial. Every example uses `app.onlysocial.io`, the address you sign in to.

> [card] [Quickstart](https://api.onlysocial.io/quickstart.md)
>
> Create an API key and make your first request in a few minutes.

> [card] [Authentication](https://api.onlysocial.io/authentication.md)
>
> Workspace API keys, headers and permissions, and the older personal access tokens.

> [card] [Messaging API](https://api.onlysocial.io/messaging/account/get-the-authenticated-workspace.md)
>
> Contacts, conversations, messages, broadcasts and automations.

> [card] [Publishing API](https://api.onlysocial.io/publishing/diagnostics/check-your-key.md)
>
> Social accounts, posts, scheduling and media.

> [card] [Link in Bio API](https://api.onlysocial.io/biolinks/overview.md)
>
> Bio pages, short links, QR codes and custom domains.

> [card] [Webhooks](https://api.onlysocial.io/webhooks/overview.md)
>
> Get notified when posts publish, contacts are created or messages arrive.

> [card] [MCP server](https://api.onlysocial.io/mcp/overview.md)
>
> Let Claude, ChatGPT, Cursor and other AI assistants work in your workspace.

> [card] [Partner API](https://api.onlysocial.io/partner/overview.md)
>
> Provision your own customers, sign them in with SSO and connect their channels.

## The APIs

| | Messaging API | Publishing API | Link in Bio API |
| - | - | - | - |
| Covers | Contacts, tags, segments, conversations, messages, broadcasts, automations, media | Social accounts, posts, scheduling, approval, tags, media | Bio pages and blocks, short links, QR codes, pixels, form submissions, analytics, custom domains |
| Base URL | `https://app.onlysocial.io/api/v1` | `https://app.onlysocial.io/os/api/{workspace-uuid}` | `https://app.onlysocial.io/api/v1/biolinks` |
| Workspace | Chosen by the API key | In the URL, and must match the API key | Chosen by the API key |

One workspace API key can call every API, as long as you give it the permissions for each when you create it.

> [!NOTE]
>
> Some features depend on your plan. If an endpoint returns `404` even with a valid key, the feature is not included in your workspace's plan.

> [!TIP]
>
> Integrated before October 2026? Your personal access token still works on the Publishing API at the same addresses. See [Older credentials](https://api.onlysocial.io/authentication.md#older-credentials).


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