--- title: "Clear Books API: connect it to your AI chat ยท Hypamoon" description: "The Clear Books API is open and signs in with OAuth. What your AI chat can build with it on Hypamoon, how it connects, and the sources we checked." url: https://hypamoon.com/connect-to/clear-books --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Clear Books ERP and accounting # Connect Clear Books to Hypamoon Yes, with one catch. Clear Books 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 Clear Books, answered from its own docs. **Public API docs**\ **Yes.** REST API with docs at api-docs.clearbooks.co.uk; the old SOAP API takes no new apps. [Read the docs](https://www.clearbooks.co.uk/support/api/) **A key you create yourself**\ **Yes.** You register an app and generate keys in the self service developer portal, with multi factor login. [clearbooks.co.uk](https://www.clearbooks.co.uk/support/api/) **Versions or a changelog**\ **Yes.** The API reference is versioned (1.0.0) and has a Breaking changes section that lists which changes count as non breaking. [api-docs.clearbooks.co.uk](https://api-docs.clearbooks.co.uk/) **How it signs in**\ OAuth 2.0 authorization code flow for confidential clients, with access and refresh tokens; one active token per user per app. **Webhooks**\ **Not confirmed.** **Hosting**\ Cloud ## In practice What it takes in a real Clear Books administration. **Getting access**\ Register an app in the Clear Books developer portal and generate keys there. **Limits**\ None published. **Writing**\ **Not confirmed.** **Cost**\ Not published. ## What you can build Create sales invoices in Clear Books from your own order flow, and ask your chat which customers still owe you. 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 - Clear Books signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Clear Books takes more work: ask your chat to check this first. - Register your app in the Clear Books developer portal. Sustained traffic above 5 requests per second may be throttled. The SOAP API is discontinued for new applications. ## 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 Clear Books. API docs: https://api-docs.clearbooks.co.uk/. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Clear%20Books.%20API%20docs%3A%20https%3A%2F%2Fapi-docs.clearbooks.co.uk%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. - [www.clearbooks.co.uk/support/api/](https://www.clearbooks.co.uk/support/api/) - [api-docs.clearbooks.co.uk/](https://api-docs.clearbooks.co.uk/) Clear Books 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 Clear Books. 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 Clear Books? 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=clear-books) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~clear-books#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~clear-books#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)