How to connect APIUniCon to ChatGPT and Claude
You add APIUniCon once, in the settings of ChatGPT or Claude. After that, services are connected in the chat itself. Pick your AI and go through six steps.
In ChatGPT, adding APIUniCon takes a Business, Enterprise or Edu plan, and on Business an admin or owner does it. On Pro, OpenAI allows reading data only, and Plus and Free can't add it at all. If that's your plan, use Claude: it works on every plan, the free one included.
- Open Plugins:
chatgpt.com/plugins - Click + and choose Add custom MCP server
- Name:
APIUniCon, server address:https://apiunicon.online/mcp, sign-in: OAuth - Accept the warning with I understand and want to continue, then click Create as a plugin
- Install the plugin and sign in to APIUniCon: our sign-in page opens
- In a chat, type
@and pick APIUniCon from the list, then write “Connect my Allegro account”
If your ChatGPT is in another language, the buttons have other names but sit in the same places.
Works on every Claude plan, the free one included. On Team and Enterprise, an owner adds it for everyone.
- Open Customize → Connectors:
claude.ai/customize/connectors - Click + Add and choose Add custom connector
- Name:
APIUniCon, address:https://apiunicon.online/mcp, then click Continue - Claude shows the sign-in settings it found: click Continue again. Sign-in: Sign in now, client: keep Use Claude's published identity, as Claude suggests, then click Add
- Sign in to APIUniCon: our sign-in page opens
- In a chat, click + → Connectors, turn on APIUniCon and write “Connect my Allegro account”
Button names checked on 23 October 2026, in the English interface. ChatGPT and Claude change it from time to time. If something on your screen is called differently, write to support@apiunicon.online.
On Claude's free plan you can add only one connection like this. If it's already taken, see “If it didn't work”.
What to write first
Once APIUniCon is added, tell the AI which service to connect. One sentence is enough. In ChatGPT, first type @ and pick APIUniCon from the list. In Claude write it as it is, but check that APIUniCon is switched on in the chat (step 6).
Instead of Allegro, name your own service: the home page shows what you can connect. The AI replies with a link to our page. You paste the key there, and it never goes into the chat.
@APIUniCon Connect my Allegro account
Connect my Allegro account
Where to find the key
A key (also called a token or an API key) is issued by the service itself, in your account there. Look for a section on settings, integrations or developer access. Every service names it differently.
You paste the copied key on our page, not in the chat. The AI sends you the link. Neither ChatGPT nor Claude sees the key.
The menu path for a particular service is walked through in the blog:
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- AllegroHow to connect Allegro to ChatGPT and Claude: stock, sales and orders
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- KanboardKanboard in ChatGPT or Claude: where tasks pile up on the board
- KommoKommo in ChatGPT and Claude: where and why your deals are lost
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- PaymoPaymo in ChatGPT and Claude: who's overbooked next week
- PostNLPostNL in ChatGPT and Claude: parcels that weren't delivered
- Reddit AdsReddit Ads in ChatGPT and Claude: which subreddits actually convert
- SklikSklik in ChatGPT or Claude: search queries that eat the budget
- SuiteCRMSuiteCRM forecast in ChatGPT or Claude: what closes this quarter
- TrendyolTrendyol returns and customer questions in ChatGPT or Claude
- wFirmawFirma in ChatGPT or Claude: bills due, money coming in and VAT
If it didn't work
The sign-in window didn't open
If the sign-in window did not appear, the browser may have blocked the pop-up. Allow it for this site and sign in again.
APIUniCon doesn't show up in the chat
In Claude, click + → Connectors in the chat and check that APIUniCon is on. In ChatGPT, type @ and pick APIUniCon from the list. If that plugin isn't in the list, go back to step 5 and install it.
A typo in the address
The address has to match character for character: https://apiunicon.online/mcp. Check for a space at the start or the end. If you got it wrong, remove the connection and add it again with the right address.
Claude's free plan already has a connection like this
The free plan allows only one. Open Customize → Connectors, remove the one you don't need and add APIUniCon. You connect your services inside APIUniCon, so each of them doesn't need a connection of its own in Claude.
Nothing helped
Write to support@apiunicon.online and say which step you got stuck on and what you see on the screen. Don't put keys or passwords in the message.
Free to start, no card needed
For developers: Claude Code
If you work in Claude Code, add APIUniCon with a command in the terminal:
claude mcp add --transport http apiunicon https://apiunicon.online/mcpThen type /mcp in Claude Code and sign in.