Unit Converter API

io.github.Br0ski777Published by GitHub account Br0ski777v1.1.0Updated Oct 27, 2026

Unit conversion — length, weight, temperature, volume, speed, data. x402 micropayment.

VerifiedSSEWeb executableDeveloper ToolsData & Analytics

Overview

AI-generated overview

Remote MCP endpoint that converts values between measurement units (length, weight, temperature, volume, speed, data) and returns the result with its formula.

What you can do
  • Convert a numeric value from one unit to another across length, weight, temperature, volume, speed and data storage
  • Return the converted result together with the formula used and the detected category
  • Accept an optional category hint to guide the conversion
When to use it
Useful when an assistant needs quick, reliable unit conversions during calculations, data analysis, scientific or engineering work, or recipe scaling. It is not intended for currency, timezone or stock-price conversion.
Requirements
A remote MCP endpoint reached over SSE; no API key or signup. Each call is paid per use through the x402 protocol in USDC on the Base L2 network, so an x402-capable client and a funded wallet are needed.
Before you install
Every conversion is a paid call (listed at $0.003 per call) settled in USDC on Base, so automated use can spend real funds; set spending limits in the client wallet. Payment is handled by third-party facilitators, and the service is part of a larger commercial API marketplace.

Installation

In SourceWeft

  1. Open Unit Converter API in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via SSE. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.Br0ski777%2Funit-converter/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "unit-converter-api": {
      "type": "sse",
      "url": "https://unit-converter.api.klymax402.com/mcp"
    }
  }
}

README

Unit Converter API

[MCP Server] [x402] [License: MIT]

Convert between units -- length, weight, temperature, volume, speed, data storage. Formula included. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

json
{  "mcpServers": {    "unit-converter": {      "url": "https://unit-converter.api.klymax402.com/mcp"    }  }}

Quickstart -- HTTP (x402)

bash
curl -X POST "https://unit-converter.api.klymax402.com/api/convert" \  -H "Content-Type: application/json" \  -d '{"value":"1","from":"...","to":"..."}'# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
utility_convert_unitsPOST/api/convert$0.003Convert a value between measurement units

utility_convert_units

Use this when you need to convert between measurement units. Returns the conversion result with formula in JSON.

Parameters

NameTypeRequiredDescription
valuenumberyesThe numeric value to convert
fromstringyesSource unit (e.g. km, lb, celsius, l, mph, MB)
tostringyesTarget unit (e.g. mi, kg, fahrenheit, gal, km/h, GB)
categorystringnoOptional category hint: length, weight, temperature, volume, speed, data

Example response:

json
{"inputValue":100,"from":"km","to":"mi","result":62.1371,"formula":"100 km * 0.621371 = 62.1371 mi","category":"length"}

When to use: unit conversions in calculations, data analysis, scientific computing, recipe scaling, and engineering applications.

Not for: currency conversion (use finance_convert_currency), timezone conversion (use utility_convert_timezone), stock prices (use finance_get_stock_price).

Example agent prompts

  • "Convert between measurement units"

Payment

  • Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
  • Network: Base L2 (eip155:8453)
  • Asset: USDC
  • Facilitator: Coinbase CDP (primary), PayAI (fallback)
  • Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Source: README.md at commit a7eff24

Tools

0
SourceWeft has not read this server's tools yet.

Version history

1
  1. v1.1.0LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declaredRequired10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts