Obrotomierz Open Data
Compare Polish savings bonds, government bonds in 195 countries, and EU bank account sign-up bonuses.
Read-only open data on Polish retail treasury savings bonds on sale now, terms and rates by series, which countries sell government bonds to individuals and how they pay, and EU banks offering cash bonuses for opening a current account. Uses official Ministry of Finance and bank sources, CC BY 4.0. No sign-in needed.
Try asking Muse: "Which Polish savings bonds are on sale right now, and what interest do they pay?"
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Source: Found in the official MCP Registry (pl.obrotomierz/open-data) · First listed November 2, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 49 min ago.
Is it safe to connect?
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://obrotomierz.pl/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
Obrotomierz Open Data is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://obrotomierz.pl/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 111ms. Worked in n/a of checks over 30 days.
Screening · November 2, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 4
get_polish_savings_bonds_offerPolish retail treasury savings bonds (obligacje oszczędnościowe Skarbu Państwa: OTS, ROR, DOR, TOS, COI, EDO, ROS, ROD) currently on sale: series code, term, first-period interest rate, inflation margin and early redemption fee, from the official issue letters of the Polish Minisget_polish_savings_bond_seriesDetails of one Polish retail treasury savings bond series by its code (for example EDO1136 or COI1130): terms, margin, early redemption fee and the interest rate in every interest period that has started.get_retail_government_bonds_by_countryWhether a country sells government bonds to individuals at issue and how they pay (inflation plus a fixed margin, market real rate, fixed, floating, step-up or prize), for all 195 countries, with the official source for each. Without a country: the number of countries in each catget_eu_bank_account_opening_bonusesBanks in the 27 EU countries that pay a cash bonus for opening a personal current account, read one by one from bank websites, with the amount, deadline and source page. With a country code: every bank paying a bonus there. Without it: the number of banks with a bonus in each couLink
https://obrotomierz.pl/mcpQuestions about Obrotomierz Open Data in Muse
How do I connect Obrotomierz Open Data to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Obrotomierz Open Data to help me. It is a free service with an MCP server at https://obrotomierz.pl/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Obrotomierz Open Data working right now?
At the last check (November 2, 2026, 19:21 UTC) the endpoint was working, answering in 111ms. It is checked every 15 minutes.
Is Obrotomierz Open Data safe to connect to Muse?
It was screened on November 2, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Obrotomierz Open Data do in Muse?
It exposes 4 tools, including get_polish_savings_bonds_offer, get_polish_savings_bond_series, get_retail_government_bonds_by_country, get_eu_bank_account_opening_bonuses. For example, you could ask Muse: "Which Polish savings bonds are on sale right now, and what interest do they pay?"
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