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ERP and accounting

Connect FreeAgent to Hypamoon

Yes, with one catch. FreeAgent has an open API that you can use yourself, but it signs in with OAuth only, and that takes more work in a Hypamoon adapter today.

Open

The check

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

Public API docs
Yes. Public API reference on the FreeAgent Developer Dashboard. Read the docs
A key you create yourself
Yes. You register an app yourself on the Developer Dashboard to get an OAuth client ID and secret. dev.freeagent.com
Versions or a changelog
Yes. FreeAgent publishes a dated list of API changes and a versioning page with an X-Api-Version header. dev.freeagent.com
How it signs in
OAuth 2.0 with an app you register on the FreeAgent Developer Dashboard; access tokens last one hour and are renewed with a refresh token.
Webhooks
Not confirmed.
Hosting
Cloud

Your own cash and invoice overview on FreeAgent, for you and your team.

  • Invoices, bills, contacts, projects and bank transactions, straight from FreeAgent.
  • AI that spots invoices that are paid later than usual and drafts a friendly reminder for you to approve.
  • A screen for your team and a short weekly email for you.

Ask your chat

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

  • Which invoices are more than 30 days overdue, and for which clients?
  • How much did we spend per supplier last quarter?

On a schedule

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

  1. Every 15 minutes

    Invoices in FreeAgent that passed their due date.

    AI decides

    AI looks at each client's payment history and decides who needs a reminder.

    Then

    You get one email with the list and a draft reminder per client.

A screen for your team or customers

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

  • For your team

    A screen with open invoices, unexplained bank transactions and project hours, from FreeAgent.

Add Hypamoon

Text messages, email, phone, payments and agents run in the same project as the adapter.

  • Agent on a schedule

    Once a week, an agent emails you the clients who pay later than they used to.

FreeAgent 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 FreeAgent waits for your approval, one call at a time. How adapters work

Good to know

  • FreeAgent signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for FreeAgent takes more work: ask your chat to check this first.
  • OAuth tokens expire after an hour, so an adapter has to renew them with the refresh token. FreeAgent also has a separate API for accountancy practices.

Try it in your chat

Fill in what to read and write, and send it.

Say this in your chat

Build the Hypamoon recipe build-an-adapter for FreeAgent. API docs: https://dev.freeagent.com/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.

FreeAgent 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 FreeAgent. Found something that changed? Tell us at support.

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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 FreeAgent?

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

Start free

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