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HR, payroll and shifts

Connect Justworks to Hypamoon

Possible, with help from Justworks. The API is documented, but you cannot just create a key: access goes through Justworks first.

Possible

The check

Three questions about the API of Justworks, answered from its own docs.

Public API docs
Yes. The Partner API reference is public. Read the docs
A key you create yourself
No. OAuth application creation is not self service; approved partners get a client ID and secret from the Justworks team. public-api.justworks.com
Versions or a changelog
Yes. Endpoints sit under a /v1/ path and the reference carries a version number. public-api.justworks.com
How it signs in
OAuth 2.0 authorization code flow: the company approves the app, access tokens last 24 hours and refresh tokens 30 days.
Webhooks
Not confirmed.
Hosting
Cloud
Condition
Access goes through the Justworks partner team, who set up the OAuth app.

Your own people overview on Justworks, for managers who do not need the full HR system.

  • Employees, time off and payroll details, from the scopes Justworks grants.
  • AI that spots upcoming leave and gaps in the team and tells the manager.
  • A screen for managers and a weekly email for you.

Ask your chat

Answers straight from your Justworks data, in Claude or another chat with the full Hypamoon connection.

  • Who is on time off next week?
  • Which people joined the company this quarter?

On a schedule

Justworks has no webhooks we could confirm, so an agent checks every 15 minutes and decides what happens next.

  1. Every 15 minutes

    Time off coming up in the next two weeks.

    AI decides

    AI checks which teams will be short handed.

    Then

    Each manager gets one email with their team's gaps.

A screen for your team or customers

An app on your own address, with sign-in, on top of the same Justworks data.

  • For your team

    A simple team page with who is in, who is off and who is new.

Justworks stays the core: your chat builds the rest on its API, as an adapter plus an app and agents in your Hypamoon project. Reading starts after you click Allow in the portal. Every change an agent or a chat makes in Justworks waits for your approval, one call at a time. How adapters work

Good to know

  • Justworks signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Justworks takes more work: ask your chat to check this first.
  • The API is a partner API with OAuth and expiring tokens, so a fixed key in the vault does not cover it yet.

Try it in your chat

First get access from Justworks. Then fill in what to read and write, and send it.

Say this in your chat

Build the Hypamoon recipe build-an-adapter for Justworks. API docs: https://public-api.justworks.com/v1/docs. Read: [what]. Write: [what, or nothing].

Open in Claude

In Claude, or another chat with the full Hypamoon connection; adapters are not in ChatGPT yet. You paste the key in the portal, never in the chat. The full recipe

Sources

Checked on 7 November 2026.

Justworks is a name of its owner, used here only to describe the software. This page is not an official integration and Hypamoon has no partnership with Justworks. Found something that changed? Tell us at support.

More in hr, payroll and shifts

All 1094 tools

Tool not listed? Ask the chat to check its API.

The same three checks work for any software. Your chat reads the vendor's own docs and tells you what it found.

Say this in your chat

Check if [software] has an open API that a Hypamoon adapter can use: public API docs, a key or token I can create myself without asking the vendor, and versions or a changelog. Link the pages you used.

Open in Claude Open in ChatGPT

Fill in the name of your software. Checking needs no connection to Hypamoon.

Ready to connect Justworks?

Connect your chat once, then ask it to build the adapter.

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