Tausendwerk · Superintelligence needs exact tools

Q: How do I connect an agent?

Add the MCP server with one line: claude mcp add --transport http tausendwerk https://api.tausendwerk.xyz/mcp Other clients use the URL https://api.tausendwerk.xyz/mcp. Setup for Claude, Cursor and others.

Q: What happens over the limit?

The API answers 402 Payment Required with the price and a top-up link, so an agent can ask its owner.

Q: Do I pay for invalid calls?

No. Invalid input returns 400 with the schema errors, and you are not charged.

Each tool does one job, shows its price per call, and is measured in public. Tools that earn their place stay.

The instruments come from the Smithsonian collection: tools that computed before software.

Portable diptych sundial: Dates and deadlines

Thomas arithmometer: Exact maths and money

Platen printing press, patent model: JSON

McGill cash register, patent model: Identifiers and Swiss QR-bills

Yost typewriter, patent model: Language level

Agent toolsFrom CHF 0.001

Pick a group

Dates and deadlines · 4 tools · CHF 0.001–0.002

Learn more about the agent tools Connect an agent

Baldwin calculating engine: Energy at home

Pickett N600-ES slide rule: Everyday numbers

Why our calculators

Every page shows its formula: Read how the result is calculated, under every calculator.
No sign-up, no cookies: Open the page and type. The inputs stay in the address, so you can share a result.
Six fields of everyday life: Home and DIY, Garden and water, Kitchen, Car and travel, Energy at home, Everyday numbers.
The same engine as the API: Agents can call every calculator through the calculator tool, for CHF 0.001 a call.

CalculatorsFree

Pick a field

Home and DIY · 8 calculators

Learn more about the calculators Open the calculators

Small tools. Measured.

One job per tool24 exact tools01

The price is in the descriptionFrom CHF 0.001 a call02

Same input, same answer0 guesses03

We build tools that compute instead of guess, for AI agents and for the people who use them.

Portable diptych sundial, 1518 — **Portable diptych sundial**1518

Vopel compendium, ca. 1540 — **Vopel compendium**ca. 1540

Nested cup weights, 1652–1698 — **Nested cup weights**1652–1698

Bond marine chronometer, ca. 1812 — **Bond marine chronometer**ca. 1812

Thomas arithmometer, ca. 1820 — **Thomas arithmometer**ca. 1820

Arithmetic card, ca. 1831 — **Arithmetic card**ca. 1831

Platen printing press, patent model, 1850 — **Platen printing press, patent model**1850

Francis typewriter, patent model, 1857 — **Francis typewriter, patent model**1857

Ballou adding machine, 1860 — **Ballou adding machine**1860

Alexander calculating machine, 1864 — **Alexander calculating machine**1864

Baldwin calculating engine, 1875 — **Baldwin calculating engine**1875

Yost typewriter, patent model, 1885 — **Yost typewriter, patent model**1885

McGill cash register, patent model, 1886 — **McGill cash register, patent model**1886

Thacher cylindrical slide rule, 1890s — **Thacher cylindrical slide rule**1890s

Odhner arithmometer, ca. 1896 — **Odhner arithmometer**ca. 1896

Amsler polar planimeter, ca. 1925 — **Amsler polar planimeter**ca. 1925

Pickett N600-ES slide rule, ca. 1962 — **Pickett N600-ES slide rule**ca. 1962

17 instruments from the Smithsonian collection, 1518 to 1962. Credits

Real answers

The examples from the tool descriptions. Same input, same answer.

@business_days

{"from":"2026-12-20","to":"2027-01-10","region":"CH-ZH"}

→ 13 business days. Skips 5 weekend days and Christmas Day (25 Dec 2026), Saint Stephen's Day (26 Dec 2026), New Year's Day (1 Jan 2027).

CHF 0.002Computed when this page was built

@business_days

{"from":"2026-12-23","to":"2027-01-05","region":"CH-ZH"}

→ 7 business days, skipping Christmas Day, Saint Stephen's Day and New Year's Day

CHF 0.002View tool ›@is_business_day

{"date":"2026-09-10","region":"CH-GE"}

→ false, holiday "Genevan Fast"

CHF 0.001View tool ›@holidays

{"region":"CH-TI","year":2026}

→ 15 holidays, including Saints Peter and Paul on 2026-06-29

CHF 0.002View tool ›@calculate

{"expression":"0.1 + 0.2"}

→ {"value":"0.3","exact":true}

CHF 0.001View tool ›@convert_units

{"value":"1","from":"mi","to":"km"}

→ {"value":"1.609344","exact":true}

CHF 0.001View tool ›@finance

{"operation":"payment","principal":"500000","annual_rate_percent":"1.8","years":25}

→ "2070.93" per month

CHF 0.003View tool ›@validate_json

{"data":{"age":-1},"schema":{"type":"object","required":["name"],"properties":{"age":{"type":"integer","minimum":0}}}}

→ valid: false, 2 errors

CHF 0.001View tool ›@test_data

{"type":"invoice","country":"CH","count":1,"seed":42}

→ one invoice in CHF with 8.1% VAT, a QR reference and 5-centime rounding

CHF 0.005View tool ›@text_level

{"text":"Ich wohne in Bern. Ich habe einen Hund. Er heisst Max.","language":"de"}

→ cefr "A1"

CHF 0.04View tool ›@validate_identifier

{"value":"CHE-116.281.710"}

→ {"type":"ch_uid","valid":true,"normalized":"CHE-116.281.710"}

CHF 0.001View tool ›@convert_time

{"time":"2026-11-02T09:00","from_zone":"America/New_York","to_zones":["Europe/Zurich","Asia/Tokyo"]}

→ 15:00 in Zurich (+01:00), 23:00 in Tokyo

CHF 0.001View tool ›@iso_week

{"date":"2027-01-01"}

→ {"iso":"2026-W53-5","monday":"2026-12-28","sunday":"2027-01-03"}

CHF 0.001View tool ›

A few words about us

TausendwerkA thousand works

Tausendwerk builds small software tools that compute instead of guess. AI agents call them over MCP or REST. People use the same engines as free calculators, puzzle books and graded readers. Tausendwerk is based in Switzerland and runs with the help of AI agents.

A thousand works. One standard.

How we workSmall tools. Measured.

Every tool states its price per call and its limits in plain words. Calls, errors and latency are published. Tools that do not earn are retired, and we announce it 30 days ahead.

Tools that earn their place stay.

Tools and prices

Pricing

Dates and deadlines

Exact maths and money

JSON

Files

Convert documents to Markdown or JSONCHF 0.01

Test data

Identifiers and Swiss QR-bills

Time

Language level

Puzzles and everyday

From the workshop

Agent tools: 24 exact tools over MCP and REST

Business days for 166 regions, exact arithmetic, JSON repair, file conversion, valid test data, IBAN and VAT checks, Swiss QR-bills.

24 toolsFor agentsOpen ›

Calculators that show their formula

30 free calculators for home, garden, kitchen, travel, energy and everyday numbers. No sign-up, no cookies.

FreeFor peopleOpen ›

Neu in Bern, a German reader for level A2

Ana, a nurse from Lisbon, starts a new life in Bern. Eight original stories with a word list, a grammar box and exercises.

Ebook and paperbackBooksOpen ›

Puzzles with exactly one solution

Sudoku in English and German, graded by the techniques a person needs, and German word searches in large print.

3 booksBooksOpen ›

Notion templates that do the arithmetic

Swiss Freelancer OS, Language Learning Tracker and Home Renovation Planner. Linked databases with example data.

3 templatesNotionOpen ›

The brand kit

Logo, colours, type, voice, print and social templates. Everything you need to show Tausendwerk correctly.

Free downloadBrandOpen ›

Every tool states its price per call and its limits in plain words.

100 calls a day are free. No account needed.

Connect an agent

FAQ

Bond marine chronometer, ca. 1812

How do I connect an agent?

Add the MCP server with one line: claude mcp add --transport http tausendwerk https://api.tausendwerk.xyz/mcp

Other clients use the URL https://api.tausendwerk.xyz/mcp. Setup for Claude, Cursor and others.

What does a call cost?

Each tool has one price per successful call, from CHF 0.001. The price is in the tool's description, so an agent can decide before it calls. All prices.

Is there a free allowance?

Yes. 100 calls per day per client, without a key.

What happens over the limit?

The API answers 402 Payment Required with the price and a top-up link, so an agent can ask its owner.

Do I pay for invalid calls?

No. Invalid input returns 400 with the schema errors, and you are not charged.

Do you store what I send?

No. The content you send is processed in memory to answer the call, then discarded. Privacy.

Which tools use a language model?

Only the two language-level tools. All others are plain code: the same input gives the same output.

Does credit expire?

No. You buy credit of CHF 5, 20, 50, 200 through Stripe (card, TWINT), and it does not expire.

Calculators for everyday jobs

All 30 calculators

A painter in red overalls rolls yellow paint onto a white wall — Photo: Ali Mkumbwa on Unsplash

Paint calculator: How many litres of wall paint a room needs, after doors and windows, for any number of coats.Home and DIY · Free

A kitchen scale on a shelf next to cookbooks and jars — Photo: T on Unsplash

Recipe scaler: Scale any ingredient amount from one number of servings to another.Kitchen · Free

A metal watering can on dry soil beside a vegetable bed — Photo: Marine Le Gac on Unsplash

Soil and mulch calculator: Volume and number of bags of soil, compost or mulch for a bed.Garden and water · Free

Superintelligence needs exact tools.

Why our tools