Apps

Small self-contained web tools, built and run in place

Unit Converter — Convert between units — temperature, weight, dis... Free

Flashcards — Study flashcards — click to flip, arrow keys to ... Free

Bookmarks — Save links privately or publicly — an example ap... Free

8 apps available

Build apps, set your price, earn 90%% of every sale.

Or just ask — the apps agent calls these for you:Build me a tip calculator What apps do I have?Make a countdown to Friday Add live prices to that one

Calling it

Metered methods answer an unauthenticated call with 402 and an x402 challenge — pay it and the same request succeeds, with no account at all. A token works too.

curl -H "Authorization: Bearer $MU_TOKEN" \
  https://mu-mcp.yvangodard.me/api/v1/apps/list

How every call behaves →

Methods

15 creditsPOST /api/v1/apps/build

Build a small app from a description, save it, and return its details and URL. An app is a single page — a tracker, a checklist, a counter — that keeps its own store and runs in the browser

Changes something, so POST only. Draws 15 credits per call, or accepts payment.

Argument	Type	Description
`prompt` *	string	Description of the app to build, e.g. 'an expense tracker', 'a packing checklist', 'a water intake counter'

curl -X POST \
  -H "Authorization: Bearer $MU_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"prompt"}' \
  https://mu-mcp.yvangodard.me/api/v1/apps/build

prompt *

Costs 15 credits

POST /api/v1/apps/create

Create an app — a small, self-contained HTML tool hosted here. Takes the HTML; apps_build writes it for you from a description

Changes something, so POST only.

Argument	Type	Description
`name` *	string	App name, e.g. "Pomodoro Timer"
`html` *	string	The app's HTML, inline CSS and JavaScript included, up to 256KB
`slug`	string	URL-friendly id, e.g. pomodoro-timer. Derived from the name if omitted
`description`	string	What the app does. Defaults to the name
`tags`	string	Comma-separated tags
`icon`	string	An SVG icon
`price`	number	Credits charged per use, 0 for free, up to 1000

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{"html":"html","name":"name"}' \
  https://mu-mcp.yvangodard.me/api/v1/apps/create

name *html *slugdescriptiontagsiconprice

8 creditsPOST /api/v1/apps/edit

Edit an app you own — its name, description, tags, icon, HTML or price. Fields left out keep their value

Changes something, so POST only. Draws 8 credits per call, or accepts payment.

Argument	Type	Description
`slug` *	string	The app's URL slug, e.g. pomodoro-timer
`name`	string	New name. Left alone if omitted
`description`	string	New description. Left alone if omitted
`tags`	string	New comma-separated tags. Left alone if omitted
`html`	string	New HTML, up to 256KB. Left alone if omitted
`icon`	string	New SVG icon. Left alone if omitted
`price`	number	Credits charged per use, 0 for free, up to 1000

curl -X POST \
  -H "Authorization: Bearer $MU_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"slug":"slug"}' \
  https://mu-mcp.yvangodard.me/api/v1/apps/edit

slug *namedescriptiontagshtmliconprice

Costs 8 credits

POST /api/v1/apps/fork

Fork an app into your own account, to change independently of the original

Changes something, so POST only.

Argument	Type	Description
`slug` *	string	Slug of the app to fork
`new_slug`	string	Slug for the copy. Generated from the original if omitted

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{"slug":"slug"}' \
  https://mu-mcp.yvangodard.me/api/v1/apps/fork

slug *new_slug

GET /api/v1/apps/read

Read the details of one app by its slug

Argument	Type	Description
`slug` *	string	The app's URL slug, e.g. pomodoro-timer

curl \
  "https://mu-mcp.yvangodard.me/api/v1/apps/read?slug=slug"

slug *

POST /api/v1/apps/run

Publish a snippet of JavaScript and get back a URL that runs it in a browser. It returns a link rather than output — the code runs in a sandbox when somebody opens it, not here

Changes something, so POST only.

Argument	Type	Description
`code` *	string	JavaScript to run in the page. It runs as a module, in a sandbox, with no access to the caller's account

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{"code":"code"}' \
  https://mu-mcp.yvangodard.me/api/v1/apps/run

code *

GET /api/v1/apps/search

Search the apps directory for small, useful tools, by name, description or tag

Argument	Type	Description
`query`	string	Search query — name, description or tag
`tag`	string	Filter to apps carrying this tag

curl \
  "https://mu-mcp.yvangodard.me/api/v1/apps/search"

querytag

POST /api/v1/apps/test

Test an app by checking its HTML and running its mu.api calls server-side, so an author finds out what is broken without opening it

Changes something, so POST only.

Argument	Type	Description
`slug` *	string	The app's URL slug

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{"slug":"slug"}' \
  https://mu-mcp.yvangodard.me/api/v1/apps/test

slug *

The same methods are tools over MCP, and every service on this instance is in one reference. Same method, same answer, same price.