--- title: "Merit Aktiva API: connect it to your AI chat ยท Hypamoon" description: "The Merit Aktiva API is open and signs in with signed requests. What your AI chat can build with it on Hypamoon, how it connects, and the sources we checked." url: https://hypamoon.com/connect-to/merit-aktiva --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Merit Aktiva ERP and accounting # Connect Merit Aktiva to Hypamoon Yes, with one catch. Merit Aktiva 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 Merit Aktiva, answered from its own docs. **Public API docs**\ **Yes.** [Read the docs](https://api.merit.ee/) **A key you create yourself**\ **Yes.** You create the API id and API key yourself under Settings, API settings. [api.merit.ee](https://api.merit.ee/) **Versions or a changelog**\ **Yes.** Versioned paths (/api/v1/), dated changes and a change log page. [api.merit.ee](https://api.merit.ee/connecting-robots/reference-manual/rate-limiter/) **How it signs in**\ Each call carries your API id, a UTC timestamp and an HMAC SHA256 signature made with your API key. **Webhooks**\ **Not confirmed.** **Hosting**\ Cloud ## In practice What it takes in a real Merit Aktiva administration. **Getting access**\ Create an API id and API key in Merit Aktiva under Settings, API settings. **Limits**\ 100 requests per minute; documents up to 500 rows. [api.merit.ee](https://api.merit.ee/connecting-robots/reference-manual/rate-limiter/) **Writing**\ **Read and write.** Write documents such as invoices, orders, offers and ledger entries directly into the company. **Cost**\ Not published. ## Your own customer and invoice flow on Merit Aktiva, built around how your business runs. - Customers, invoices, offers, orders and ledger entries, straight from Merit Aktiva. - AI that drafts invoices from orders and spots customers who start paying late, with you approving every document. - A screen for your team and a short weekly email for you. ### Ask your chat Answers straight from your Merit Aktiva data, in Claude or another chat with the full Hypamoon connection. - Which customers have invoices more than 30 days overdue? - What did we invoice per customer this quarter? ### On a schedule Merit Aktiva has no webhooks we could confirm, so an agent checks every 15 minutes and decides what happens next. 1. Every 15 minutes New orders in your own system that have no invoice in Merit Aktiva yet. AI decides AI checks the customer, prices and VAT and prepares the invoice. Then The invoice is created in Merit Aktiva after you approve it. AI proposes, you approve ### A screen for your team or customers An app on your own address, with sign-in, on top of the same Merit Aktiva data. - For your customers Customers sign in and see their open invoices and offers, straight from Merit Aktiva. ### Add Hypamoon Text messages, email, phone, payments and agents run in the same project as the adapter. - Agent on a schedule Once a week, an agent emails you the customers who pay later than they used to. Merit Aktiva 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 Merit Aktiva waits for your approval, one call at a time. [How adapters work](https://hypamoon.com/docs/adapters) ### Good to know - Merit Aktiva signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Merit Aktiva takes more work: ask your chat to check this first. - 100 requests per minute, with a 429 and a Retry-After header above that. Documents can have at most 500 rows. Merit advises a separate free company for testing. ## 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 Merit Aktiva. API docs: https://api.merit.ee/. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Merit%20Aktiva.%20API%20docs%3A%20https%3A%2F%2Fapi.merit.ee%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.merit.ee/](https://api.merit.ee/) - [api.merit.ee/connecting-robots/reference-manual/rate-limiter/](https://api.merit.ee/connecting-robots/reference-manual/rate-limiter/) Merit Aktiva 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 Merit Aktiva. 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 Merit Aktiva? 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=merit-aktiva) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~merit-aktiva#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~merit-aktiva#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)