--- title: "easybill API: connect it to your AI chat ยท Hypamoon" description: "The easybill API is open, signs in with a bearer token and sends webhooks. What your AI chat can build with it on Hypamoon, with sources." url: https://hypamoon.com/connect-to/easybill --- 1. [Connect to](https://hypamoon.com/connect-to) 2. easybill Payments and billing # Connect easybill to Hypamoon Yes. easybill 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 easybill, answered from its own docs. **Public API docs**\ **Yes.** Public Swagger reference for the REST API v1. [Read the docs](https://www.easybill.de/api) **A key you create yourself**\ **Yes.** You generate the API key yourself under Profile and settings; easybill asks you to renew it at least once a year. [support.easybill.de](https://support.easybill.de/hc/de/articles/115003808529-API-Key-REST-Schnittstelle) **Versions or a changelog**\ **Yes.** Versioned API (v1) with a dated changelog. [api.easybill.de](https://api.easybill.de/rest/v1/CHANGELOG.md) **How it signs in**\ The API key as a bearer token, or HTTP Basic with your login email and the API key. **Webhooks**\ **Yes.** It can tell your app when something changes. [api.easybill.de](https://api.easybill.de/rest/v1/swagger.json) **Hosting**\ Cloud **Condition**\ The API is listed for the Plus and Business plans. ## Your own invoice portal on easybill, for your customers and your team. - Customers, documents, invoices and payments from easybill. - AI that spots customers who start paying late and drafts a friendly reminder for you to approve. - A portal for your customers and a weekly email for you. ### Ask your chat Answers straight from your easybill data, in Claude or another chat with the full Hypamoon connection. - Which invoices are more than 14 days overdue? - How much did we invoice per customer this quarter? ### When something happens easybill sends a webhook to your app, and the app asks AI what happens next. 1. When A document is created or paid in easybill. AI decides AI checks whether the customer pays later than before. Then You get an email with the customers to follow up. ### A screen for your team or customers An app on your own address, with sign-in, on top of the same easybill data. - For your customers Customers sign in and download their invoices and quotes from easybill. ### Add Hypamoon Text messages, email, phone, payments and agents run in the same project as the adapter. - Email An email to the customer when a quote is waiting for an answer. easybill 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 easybill 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. - Request limits: 10 per minute on Plus and 60 per minute on Business. Lists return up to 1000 items per page. ## 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 easybill. API docs: https://www.easybill.de/api. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20easybill.%20API%20docs%3A%20https%3A%2F%2Fwww.easybill.de%2Fapi.%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.easybill.de/api](https://www.easybill.de/api) - [support.easybill.de/hc/de/articles/115003808529-API-Key-REST-Schnittstelle](https://support.easybill.de/hc/de/articles/115003808529-API-Key-REST-Schnittstelle) - [api.easybill.de/rest/v1/CHANGELOG.md](https://api.easybill.de/rest/v1/CHANGELOG.md) - [api.easybill.de/rest/v1/swagger.json](https://api.easybill.de/rest/v1/swagger.json) easybill 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 easybill. Found something that changed? 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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 easybill? 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=easybill) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~easybill#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~easybill#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)