--- title: "Payhawk API: connect it to your AI chat ยท Hypamoon" description: "The Payhawk API is open, signs in with an API key and sends webhooks. What your AI chat can build with it on Hypamoon, with sources." url: https://hypamoon.com/connect-to/payhawk --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Payhawk ERP and accounting # Connect Payhawk to Hypamoon Yes. Payhawk 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 Payhawk, answered from its own docs. **Public API docs**\ **Yes.** Payhawk points to its API reference on developers.payhawk.com. [Read the docs](https://payhawk.com/integration/api) **A key you create yourself**\ **Yes.** The API key is in the Payhawk Portal under Account, Settings; if it is not activated yet, Payhawk activates it on request. [payhawk.com](https://payhawk.com/integration/api) **Versions or a changelog**\ **Yes.** Versioned API (v3 in the base address). [payhawk.com](https://payhawk.com/integration/api) **How it signs in**\ An API key from the Payhawk Portal settings, sent with each request to api.payhawk.io. **Webhooks**\ **Yes.** It can tell your app when something changes. [payhawk.com](https://payhawk.com/integration/api) **Hosting**\ Cloud ## Your own expense overview on Payhawk, built around how your team spends. - Card expenses, receipts, suppliers and accounts, straight from Payhawk. - AI that checks each expense and proposes the category and cost centre, with a person approving. - A screen for budget owners and a weekly email for finance. ### Ask your chat Answers straight from your Payhawk data, in Claude or another chat with the full Hypamoon connection. - Which card expenses from this month still have no receipt? - Which suppliers did we pay most this quarter? ### When something happens Payhawk sends a webhook to your app, and the app asks AI what happens next. 1. When A new expense is created in Payhawk. AI decides AI reads the receipt and checks amount, VAT and category against earlier expenses. Then Finance gets an email when something looks off. ### A screen for your team or customers An app on your own address, with sign-in, on top of the same Payhawk data. - For your team Budget owners see their team's expenses and missing receipts per month. ### Add Hypamoon Text messages, email, phone, payments and agents run in the same project as the adapter. - Email Employees get one reminder email with the receipts they still need to add. Payhawk 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 Payhawk 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 API allows 15 requests per second. A development sandbox is available on request. ## 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 Payhawk. API docs: https://developers.payhawk.com/. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Payhawk.%20API%20docs%3A%20https%3A%2F%2Fdevelopers.payhawk.com%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. - [payhawk.com/integration/api](https://payhawk.com/integration/api) Payhawk 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 Payhawk. 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 Payhawk? 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=payhawk) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~payhawk#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~payhawk#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)