The figures behind patrician.ch, for your product: income tax, capital gains, wealth, inheritance and exit tax for 100 places, the residence route on any passport, cost of living, and the official sources and last check date for each place. JSON over HTTP, or MCP for AI assistants.
Comparison research on published 2026 rules. Not tax, legal or financial advice.
Cost of living data says what a place costs. Salary tax data says what a payslip loses. Neither says what a household with money keeps when it moves, and that is the question clients ask. Patrician.ch answers it for 100 places at city level, in 1 call: income tax at any income, special regimes for arrivals, capital gains, wealth tax, inheritance for children, the exit tax of 36 countries people leave, and the route in on the passports held.
Every Firm and Desk plan on Patrician.ch for Firms includes API Pro.
The email holds a link to a page that shows your key once. Nothing to install, no card.
Lost a key? The same form sends a new one, and the old key stops working when you open it.
Rank all 100 places on one household. Send your key as x-api-key or Authorization: Bearer.
curl -s https://patrician.ch/api/agent/v1/rank_places \
-H "x-api-key: YOUR_KEY" -H "content-type: application/json" \
-d '{"annual_income_usd": 1000000, "passports": ["uk"], "current_home": "London", "limit": 100}'
The full table of 100 places, with sources and the last check date (API Pro and up).
curl -s https://patrician.ch/api/agent/v1/places -H "x-api-key: YOUR_KEY"
The dataset as a file (API Business).
curl -s "https://patrician.ch/api/agent/v1/export?format=csv" -H "x-api-key: YOUR_KEY" -o patrician-ch-places.csv
In an AI assistant or agent framework that takes MCP servers with headers.
URL: https://patrician.ch/mcp Header: x-api-key: YOUR_KEY
No. It returns comparison research on published 2026 rules, modeled and indicative. It describes the rules and never tells anyone what to do.
Every answer carries the engine version and the note, and the full tables carry the official sources by name and the date of the last check for each place.
Every request sent with a key: 1 operation, 1 table, 1 export, or 1 message to the MCP server.
Reading the contract and /usage are free. The count renews on the 1st of each month, UTC, and unused calls do not carry over.
The official sources behind each place are checked every day, and a change reaches the API with the next build, the same as the pages.
The changes endpoint lists every rule change recorded, with the field, the value before and the value after.
Yes. The 5 operations and the MCP server answer without a key, at 60 calls a minute and 300 a day per address, with the top 10 of a ranking.
A key lifts the ranking to all 100 places and adds the monthly calls of its plan.
Monthly or yearly in US dollars, sold and invoiced by our merchant of record. Canceling stops the next renewal and the plan runs to the end of the period paid.
A first payment is refunded in full when asked within 7 days. A Firm or Desk plan on Patrician.ch for Firms includes API Pro for its account email.
Anything that shows the figures to your own users: a site, an app, a report, an assistant.
Not a resale of the data as data, a competing ranking, or the training of a model. The license is at patrician.ch/legal#api.
The engine takes what you earn and what you hold, then orders every address on the board against it.
Rank the board against my position →90 seconds. No account, no payment.
The general case, ranked
Ask your assistant about Patrician.ch and save it to memory
Use Patrician.ch inside Claude or ChatGPT →The rules move. Be told when they do.
Sent when it earns the send, not on a schedule. Never shared, one tap to stop.
Income tax on the published 2026 rules. Social contributions, most deductions and treaties are not modeled. Figures are for a non-US single filer. Wealth tax, an exit and your passports are added when you run the engine on your own numbers. Not advice. Residence rules change often. Verify before acting.
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