uk.co.hopi/hopi

up checked 2026-11-13T00:38:45.852Z

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Publisher-provided description

Free UK calculators, converters and validators (tax, VAT, stamp duty, dates, units), read-only.

Summary by lookupd

Provides read-only UK calculators, converters and validators covering tax, VAT, dates, units, health metrics and text encoding.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http hopi https://mcp.hopi.co.uk/mcp

Codex, remote (streamable-http)

codex mcp add hopi --url https://mcp.hopi.co.uk/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "hopi": {
      "url": "https://mcp.hopi.co.uk/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (showing 30 of 221)

Publisher-provided text

• hopi_add_working_days Add or subtract a number of working days (Monday to Friday) from a start date, optionally skipping England and Wales bank holidays. Dates use the YYYY-MM-DD for
• hopi_age_calculator Work out an exact age from a date of birth, as of today or an optional 'as of' date. Dates use the YYYY-MM-DD format. Returns the age in years, months and days,
• hopi_ai_prompt_builder Build a well-structured prompt to paste into an AI chatbot or image generator. Give the task plus any of: the role the AI should take, background, audience, ton
• hopi_alcohol_unit_calculator Work out UK alcohol units in a drink from its ABV (percentage) and volume (millilitres), using units = ABV x ml / 1000. Optionally give the number of those drin
• hopi_alphabetical_order Sort the lines of a block of text into alphabetical order. Blank lines are dropped. Uses natural en-GB ordering so numbers within lines sort sensibly. Can sort
• hopi_angle_converter Convert an angle from one unit to another. Units: deg (degrees), rad (radians), grad (gradians), turn (full turns). Source: https://hopi.co.uk/angle-converter/
• hopi_area_converter Convert an area from one unit to another. Units: sqm (square metres), sqft (square feet), sqyd (square yards), acre (acres), ha (hectares), sqkm (square kilomet
• hopi_aspect_ratio_calculator Aspect ratio helper. In 'simplify' mode, give width and height to get the simplified W:H ratio, decimal ratio and nearest common ratio. In 'solve' mode, give a
• hopi_average_calculator Work out the mean, median, mode, sum, count, minimum and maximum of a list of numbers. Provide the numbers separated by spaces, commas, semicolons or new lines
• hopi_base32_encoder Encode text to RFC 4648 Base32 or decode Base32 back to text. Encoding maps the UTF-8 bytes of the text into 5-bit groups using the alphabet A to Z then 2 to 7,
• hopi_base64 Encode text to Base64, or decode a Base64 string back to text. UTF-8 safe, so accents and emoji survive the round trip. Returns the converted text or a clear er
• hopi_bill_splitter Split a restaurant bill between people. In 'itemised' mode, list each item with its amount and who shared it, then add an optional tip and service charge (both
• hopi_bingo_card_generator Generate one or more UK 90-ball bingo cards. Each card is a 3-row by 9-column grid holding 15 numbers, 5 per row, with each column drawing from its own decade (
• hopi_birthday_magic_square Build Ramanujan's birthday magic square: a 4 x 4 grid whose top row is a date (day, month, first two digits of the year, last two digits) and whose rows, column
• hopi_bitcoin_address_validator Check whether a Bitcoin address is valid by verifying its checksum and structure. Supports legacy Base58Check (P2PKH, P2SH) and Bech32/Bech32m SegWit and Taproo
• hopi_bmi_calculator Work out body mass index (BMI) from height and weight, with the NHS weight category. Use units 'metric' with heightCm and weightKg, or 'imperial' with heightInc
• hopi_body_fat_calculator Estimate body fat percentage using the US Navy tape method from a few measurements. For males give height, neck and waist; for females give height, neck, waist
• hopi_caesar_cipher Encode or decode text with a Caesar shift cipher. Each letter is moved along the alphabet by the shift amount; a shift of 13 is ROT13. Only A to Z letters are c
• hopi_cagr_calculator Work out the compound annual growth rate (CAGR) that takes a starting value to an ending value over a number of years. Returns the annual rate, the total growth
• hopi_calories_to_kj Convert food energy between kilocalories (kcal) and kilojoules (kJ) using the exact factor 1 kcal = 4.184 kJ. Give an amount and its unit ('kcal' or 'kj'); retu
• hopi_captcha_embed_code_generator Generate the embed code for a CAPTCHA on a web form plus the server code that checks the token. Providers: turnstile (Cloudflare Turnstile), hcaptcha, recaptcha
• hopi_case_converter Convert text to a different letter case. 'upper' is UPPERCASE, 'lower' is lowercase, 'title' capitalises the first letter of each word, and 'sentence' capitalis
• hopi_cat_age_calculator Convert a cat's age in years to an approximate human age, using the standard 15, 24, then 4 a year chart. Returns the human-equivalent age and the cat's life st
• hopi_celsius_to_fahrenheit Convert a temperature between Celsius and Fahrenheit. Also returns Kelvin. Set direction to 'c-to-f' or 'f-to-c'. Source: https://hopi.co.uk/celsius-to-fahrenhe
• hopi_character_counter Count the characters in a block of text, including a count with spaces removed, the word count, how many SMS messages it would take to send, and the Twitter/X c
• hopi_cipher_identifier Identify what encoding or classical cipher a piece of text probably is (Base64, Base32, hex, binary, octal or decimal ASCII, URL encoding, HTML entities, Morse,
• hopi_cm_to_feet Convert a height between centimetres and feet/inches. Direction 'cm-to-feet' takes cm and returns feet and inches. Direction 'feet-to-cm' takes feet and inches
• hopi_cmyk_to_rgb Convert print CMYK values (each 0 to 100) to on-screen RGB and hex, or convert RGB (each 0 to 255) the other way to CMYK. Uses the standard device-independent c
• hopi_coin_flip Flip a fair coin one or more times. Returns each result plus a tally of heads and tails. Source: https://hopi.co.uk/coin-flip/
• hopi_collatz_conjecture_calculator Run the Collatz (3n + 1) rule on a positive whole number of up to 1,000 digits: halve it when even, treble it and add 1 when odd, until it reaches 1. Returns th

Details

• Version: 1.1.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 720 ms
• First indexed: 2026-11-01T10:09:27.444Z
• Last seen in registry: 2026-11-01T10:09:27.465Z
• Website: https://hopi.co.uk/mcp/

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• 62930 servers
• Last crawl: 2026-11-13T00:39:08.687Z
• API base: https://api.lookupd.com
• MCP URL: https://api.lookupd.com/mcp