---
title: Build on SalexHub
description: "The REST API and the MCP server on one registry of tools, webhooks, embeds, forms, tracking and a messenger bridge: what a developer can connect today."
url: https://salexhub.com/docs/developers
type: conceptual
area: developers
section: Developers
last_updated: 2026-10-08
prerequisites: []
related:
  - https://salexhub.com/developers
  - https://salexhub.com/docs/agent/autonomy
tools: []
checked_against: salexhub/platform 3313253a4
---

# Build on SalexHub

The REST API and the MCP server on one registry of tools, webhooks, embeds, forms, tracking and a messenger bridge: what a developer can connect today.

The Agent, workflows and API keys go through one registry of 523 tools. A call from the Agent, a workflow or an API key meets your approval rules before it runs. A call from a person, the Agent or an API key is also checked against that caller's role, and the Agent and workflows work within a budget of steps and AI credits. The app's own screens save through the registry too, except some settings, such as the organization's profile, AI settings and your own account. Since 7 October 2026 the same registry answers outside the product, over HTTP and over MCP.

## Open today

| What | What it does |
| --- | --- |
| [REST API](https://salexhub.com/docs/developers/api-keys#calling-the-api) | One operation for each tool in the registry, at `https://app.salexhub.com/api/v1`, with a key from Settings as the bearer token. The OpenAPI document that describes every operation is served at the same address. |
| [MCP server](https://salexhub.com/docs/developers/api-keys#mcp) | The same tools for agents that speak MCP, at the same address and under the same permissions, budgets and approval rules. |
| [Webhooks](https://salexhub.com/docs/developers/webhooks) | Signed events to your HTTPS endpoint when a record is created or updated, and when a document moves, such as an accepted quote or an issued invoice. Retries follow a schedule, and every delivery is listed. Owners and Admins add endpoints in Settings. |
| [Embeds](https://salexhub.com/docs/developers/embeds) | Live data from records you choose to publish, on any website: a script tag and a placeholder, or JSON and HTML from one address. Read-only and keyless, only the fields you name, never personal data. |
| [Form endpoint](https://salexhub.com/docs/developers/forms) | Your site's own form posts its fields to one address, and each submission lands in your organization as a contact. Comes with the Marketing hub. |
| [Tracking script](https://salexhub.com/docs/developers/tracking) | One script for cookie-free page views and your own events, and identifying a visitor who gives an email. Comes with the Marketing hub. |
| [Messenger bridge](https://salexhub.com/docs/developers/messenger-bridge) | A small bridge you run posts conversations from a messenger to your organization with a channel key. Replies go back by signed push or by pull. |
| [AI Gateway API](https://salexhub.com/docs/developers/api-keys#ai-gateway-keys) | Your own code calls the models your organization can run, through one OpenAI-compatible address and a key made for it in **Settings > AI > AI Gateway > Keys**. Each call runs on your organization's own provider key where one serves the model, otherwise on AI credits. |
| This site, for agents | Every page of salexhub.com, these docs included, is also Markdown: add `.md` to its address or ask for `text/markdown`. The index is [llms.txt](https://salexhub.com/llms.txt). |

## Built, not published

- **TypeScript SDK** (coming soon) A generated client for the same operations, built from the OpenAPI document the API serves. It lives in the product's repository and is not published to a package registry.

Keys are issued in **Settings > Developers > API keys**. A key acts at the weaker of its own role and its creator's, expires after 30 days, 90 days or 1 year, and is accepted by the REST API and the MCP server: [API keys, REST and MCP](https://salexhub.com/docs/developers/api-keys) has the detail.

Questions about building on SalexHub go to [start@salexhub.com](mailto:start@salexhub.com?subject=Developers).

---

The same page for people: https://salexhub.com/docs/developers. Index of this site for agents: https://salexhub.com/llms.txt