Hopi MCP MCP server

Hopi operates a remote MCP server exposing over 200 calculators, converters, and validators for UK tax, VAT, dates, units, and more. It allows AI assistants to perform precise calculations and validations without storing user data or requiring authentication, ensuring privacy while providing structured, schema-defined results.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Hopi

MCP endpoint (Streamable HTTP)

https://mcp.hopi.co.uk/mcp

Vendor documentation

What you can do with it

Calculate UK VAT, stamp duty, and take-home pay
Convert between units, currencies, and time zones
Validate IBANs, Bitcoin, and Ethereum addresses
Determine working days and bank holidays

Tools advertised by the last live check:

hopi_add_working_days
hopi_age_calculator
hopi_alcohol_unit_calculator
hopi_alphabetical_order
hopi_angle_converter
hopi_area_converter
hopi_aspect_ratio_calculator
hopi_average_calculator
hopi_base32_encoder
hopi_base64
hopi_bill_splitter
hopi_bingo_card_generator
hopi_bitcoin_address_validator
hopi_bmi_calculator
hopi_body_fat_calculator
hopi_caesar_cipher
hopi_cagr_calculator
hopi_calories_to_kj
hopi_case_converter
hopi_cat_age_calculator
hopi_celsius_to_fahrenheit
hopi_character_counter
hopi_cipher_identifier
hopi_cm_to_feet
hopi_cmyk_to_rgb
hopi_coin_flip
hopi_colour_name_finder
hopi_colour_palette_generator
hopi_colour_picker
hopi_colour_shades_generator
hopi_combination_generator
hopi_compound_interest_calculator
hopi_contrast_checker
hopi_cron_expression_parser
hopi_crypto_profit_calculator
hopi_css_gradient_generator
hopi_css_minifier
hopi_csv_to_json
hopi_cups_to_grams
hopi_currency_converter
hopi_data_size_converter
hopi_date_calculator
hopi_day_of_week_calculator
hopi_day_rate_calculator
hopi_days_between_dates
hopi_days_until_christmas
hopi_dca_calculator
hopi_dice_roller
hopi_diff_checker
hopi_discount_calculator
hopi_dog_age_calculator
hopi_download_time_calculator
hopi_due_date_calculator
hopi_dummy_data_generator
hopi_email_link_generator
hopi_emoji_remover
hopi_energy_cost_calculator
hopi_env_to_json
hopi_eth_address_checksum
hopi_eth_unit_converter
hopi_euromillions_generator
hopi_event_wine_calculator
hopi_fortune_cookie
hopi_fraction_calculator
hopi_fraction_to_decimal
hopi_fuel_cost_calculator
hopi_hash_generator
hopi_hash_identifier
hopi_heart_rate_zones
hopi_hex_to_rgb
hopi_holiday_entitlement_calculator
hopi_hourly_to_salary
hopi_hours_calculator
hopi_hsl_converter
hopi_html_escape
hopi_http_status_codes
hopi_iban_validator
hopi_ics_generator
hopi_inflation_calculator
hopi_json_formatter
hopi_json_to_csv
hopi_json_to_typescript
hopi_json_yaml_converter
hopi_jwt_decoder
hopi_kg_to_stone
hopi_leap_year_checker
hopi_length_converter
hopi_litres_to_pints
hopi_loan_calculator
hopi_lorem_ipsum_generator
hopi_lottery_number_generator
hopi_magic_8_ball
hopi_margin_calculator
hopi_markdown_previewer
hopi_market_cap_calculator
hopi_meta_tag_generator
hopi_miles_to_km
hopi_military_time_converter
hopi_minutes_to_hours
hopi_moon_phase_calculator
hopi_morse_code_translator
hopi_mortgage_calculator
hopi_mortgage_overpayment_calculator
hopi_mpg_converter
hopi_national_insurance_calculator
hopi_nato_phonetic_alphabet
hopi_net_to_gross
hopi_number_base_converter
hopi_number_to_words
hopi_oven_temperature_converter
hopi_overtime_pay_calculator
hopi_password_strength_checker
hopi_percentage_calculator
hopi_percentage_change_calculator
hopi_percentage_decrease_calculator
hopi_percentage_difference_calculator
hopi_percentage_increase_calculator
hopi_position_size_calculator
hopi_power_converter
hopi_pressure_converter
hopi_prime_factorisation_calculator
hopi_pro_rata_salary_calculator
hopi_product_feed_generator
hopi_random_colour_generator
hopi_random_coordinates
hopi_random_letter_generator
hopi_random_number_generator
hopi_random_team_generator
hopi_random_word_generator
hopi_ratio_calculator
hopi_reading_time_calculator
hopi_redundancy_pay_calculator
hopi_remove_duplicate_lines
hopi_remove_extra_spaces
hopi_remove_line_breaks
hopi_reverse_text
hopi_rgb_to_hex
hopi_ring_size_converter
hopi_robots_txt_generator
hopi_roman_numerals_converter
hopi_rounding_calculator
hopi_running_pace_calculator
hopi_satoshi_converter
hopi_savings_goal_calculator
hopi_schema_markup_generator
hopi_scientific_calculator
hopi_secret_santa_generator
hopi_shoe_size_converter
hopi_sleep_calculator
hopi_slot_machine_picker
hopi_slug_generator
hopi_small_text_generator
hopi_special_characters
hopi_speed_converter
hopi_spin_the_bottle
hopi_sql_formatter
hopi_staking_calculator
hopi_stamp_duty_calculator
hopi_standard_deviation_calculator
hopi_star_sign_calculator
hopi_student_loan_calculator
hopi_take_home_pay_calculator
hopi_tarot_reader
hopi_tdee_calculator
hopi_test_card_number_generator
hopi_text_repeater
hopi_text_splitter
hopi_time_calculator
hopi_time_zone_converter
hopi_tip_calculator
hopi_triangle_calculator
hopi_ucas_points_calculator
hopi_unicode_inspector
hopi_unit_price_calculator
hopi_unix_timestamp_converter
hopi_upside_down_text
hopi_url_encoder
hopi_url_parser
hopi_user_agent_parser
hopi_username_generator
hopi_utm_link_generator
hopi_uuid_generator
hopi_vat_calculator
hopi_vigenere_cipher
hopi_volume_converter
hopi_water_intake_calculator
hopi_week_number
hopi_weight_converter
hopi_wheel_spinner
hopi_word_counter
hopi_word_frequency_counter
hopi_working_days_calculator
hopi_would_you_rather_generator
hopi_yes_no_wheel
hopi_zero_width_text_hider

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

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

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

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

Cursor

Merge this server into .cursor/mcp.json in your project, then enable hopi-mcp in your MCP settings.

Cursor configuration

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

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "hopi-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.hopi.co.uk/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start hopi-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "hopi-mcp": {
      "type": "http",
      "url": "https://mcp.hopi.co.uk/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

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

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

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

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

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

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