--- title: "Invoice Ninja API: connect it to your AI chat ยท Hypamoon" description: "The Invoice Ninja 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/invoice-ninja --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Invoice Ninja Payments and billing # Connect Invoice Ninja to Hypamoon Yes. Invoice Ninja 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 Invoice Ninja, answered from its own docs. **Public API docs**\ **Yes.** [Read the docs](https://api-docs.invoicing.co/) **A key you create yourself**\ **Yes.** Create a token under Settings, Account Management, Integrations, API tokens. [raw.githubusercontent.com](https://raw.githubusercontent.com/invoiceninja/invoiceninja/v5-stable/openapi/api-docs.yaml) **Versions or a changelog**\ **Yes.** Versioned releases (v5) with tags; the API lives under /api/v1. [github.com](https://github.com/invoiceninja/invoiceninja) **How it signs in**\ An API token from the Invoice Ninja settings in the X-API-TOKEN header, over HTTPS. **Webhooks**\ **Not confirmed.** **Hosting**\ Cloud and self-hosted ## Your own invoice overview on Invoice Ninja, built around how your clients pay. - Clients, invoices, quotes, payments and expenses, straight from Invoice Ninja. - AI that drafts invoices from finished work and spots clients who pay late, with you approving every invoice. - A screen for your clients and a short weekly email for you. ### Ask your chat Answers straight from your Invoice Ninja data, in Claude or another chat with the full Hypamoon connection. - Which invoices are more than 30 days overdue? - Which quotes were sent but not accepted yet? ### On a schedule Invoice Ninja has no webhooks we could confirm, so an agent checks every 15 minutes and decides what happens next. 1. Every 15 minutes Every morning, the invoices that passed their due date. AI decides AI looks at the client and the payment history and drafts a friendly reminder. Then You get the drafts by email to approve. ### A screen for your team or customers An app on your own address, with sign-in, on top of the same Invoice Ninja data. - For your customers Clients sign in and see their open invoices and quotes. ### Add Hypamoon Text messages, email, phone, payments and agents run in the same project as the adapter. - Agent on a schedule An agent turns an accepted quote into a draft invoice, after you approve. AI proposes, you approve Invoice Ninja 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 Invoice Ninja 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 hosted version runs at invoicing.co. A self-hosted Invoice Ninja must expose its API over HTTPS, or the adapter runs in the same network. - Invoice Ninja is open source and can run on your own server. Hosted and self-hosted use the same API. ## 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 Invoice Ninja. API docs: https://api-docs.invoicing.co/. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Invoice%20Ninja.%20API%20docs%3A%20https%3A%2F%2Fapi-docs.invoicing.co%2F.%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. - [api-docs.invoicing.co/](https://api-docs.invoicing.co/) - [raw.githubusercontent.com/invoiceninja/invoiceninja/v5-stable/openapi/api-docs.yaml](https://raw.githubusercontent.com/invoiceninja/invoiceninja/v5-stable/openapi/api-docs.yaml) - [github.com/invoiceninja/invoiceninja](https://github.com/invoiceninja/invoiceninja) Invoice Ninja 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 Invoice Ninja. Found something that changed? Tell us at [support](https://hypamoon.com/support#contact). ## More in payments and billing - [**Adyen** Open](https://hypamoon.com/connect-to/adyen) - [**Authorize.net** Open](https://hypamoon.com/connect-to/authorize-net) - [**Buckaroo** Unknown](https://hypamoon.com/connect-to/buckaroo) - [**Chargebee** Open](https://hypamoon.com/connect-to/chargebee) - [**Klarna** Open](https://hypamoon.com/connect-to/klarna) - [**Mollie** Open](https://hypamoon.com/connect-to/mollie) - [**MultiSafepay** Open](https://hypamoon.com/connect-to/multisafepay) - [**PayPal** Open](https://hypamoon.com/connect-to/paypal) - [**Recurly** Open](https://hypamoon.com/connect-to/recurly) - [**Stripe** Open](https://hypamoon.com/connect-to/stripe) - [**WeFact** Open](https://hypamoon.com/connect-to/wefact) - [**Pay.** Open](https://hypamoon.com/connect-to/pay-nl) - [**Billit** Open](https://hypamoon.com/connect-to/billit) - [**easybill** Open](https://hypamoon.com/connect-to/easybill) - [**GoCardless** Open](https://hypamoon.com/connect-to/gocardless) - 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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 Invoice Ninja? 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=invoice-ninja) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~invoice-ninja#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~invoice-ninja#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)