---
title: "InvoiceXpress API: connect it to your AI chat · Hypamoon"
description: "The InvoiceXpress API is open and signs in with an API key. What your AI chat can build with it on Hypamoon, how it connects, and the sources we checked."
url: https://hypamoon.com/connect-to/invoicexpress
---

1.  [Connect to](https://hypamoon.com/connect-to)
2.  InvoiceXpress

Payments and billing

# Connect InvoiceXpress to Hypamoon

Yes. InvoiceXpress has a public, versioned API and you create the key yourself, so your chat can write the adapter.

Open

## The check

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

**Public API docs**\
**Yes.** [Read the docs](https://www.invoicexpress.com/api-v2)

**A key you create yourself**\
**Yes.** Each user has an API key inside the account and can regenerate it; integrators point to Account settings, API, to find it. [invoicexpress.com](https://invoicexpress.com/api-v2/documentation/authentication/)

**Versions or a changelog**\
**Yes.** Endpoints carry a version in their path (/api/v3/), and the earlier API is kept as an archive. [invoicexpress.com](https://invoicexpress.com/api-v2/)

**How it signs in**\
An API key per user, passed in the query string of every HTTPS request.

**Webhooks**\
**Not confirmed.**

**Hosting**\
Cloud

## What you can build

Issue invoices from your own order flow in InvoiceXpress, and record payments when the money comes in.

Your chat writes it as a Hypamoon adapter from the docs above. Reading starts after you click Allow in the portal, and every write waits for your approval, one call at a time. [How adapters work](https://hypamoon.com/docs/adapters)

### Good to know

-   Your adapter uses a fixed key: you paste it once in the Hypamoon portal, never in the chat, and it only goes to the API host you allow.
-   The key acts as the user inside the account. InvoiceXpress advises regenerating it now and then.

## 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 InvoiceXpress. API docs: https://www.invoicexpress.com/api-v2. Read: \[what\]. Write: \[what, or nothing\].

[Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20InvoiceXpress.%20API%20docs%3A%20https%3A%2F%2Fwww.invoicexpress.com%2Fapi-v2.%20Read%3A%20%5Bwhat%5D.%20Write%3A%20%5Bwhat%2C%20or%20nothing%5D.)

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](https://hypamoon.com/r/build-an-adapter)

## Sources

Checked on 7 November 2026.

-   [www.invoicexpress.com/api-v2](https://www.invoicexpress.com/api-v2)
-   [invoicexpress.com/api-v2/documentation/authentication/](https://invoicexpress.com/api-v2/documentation/authentication/)
-   [invoicexpress.com/api-v2/](https://invoicexpress.com/api-v2/)

InvoiceXpress 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 InvoiceXpress. Found something that changed? Tell us at [support](https://hypamoon.com/support#contact).

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## 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](https://claude.ai/new?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) [Open in ChatGPT](https://chatgpt.com/?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.)

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

## Ready to connect InvoiceXpress?

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

[Start free](https://app.hypamoon.com/?mode=signup&utm_source=connect-to&utm_campaign=invoicexpress)

Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~invoicexpress#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~invoicexpress#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)