How it works
Select, click, compare by size
1
Select money text on a webpage.
2
Click the Marketcaper icon or right-click lookup action.
3
Open fx market cap, m2 money-supply size, and rate context where available. and compare links.
Money extension
Money browser extension
Highlight money, fiat currency codes, or currency names and open a Marketcaper card with FX market cap, M2 money-supply context, and rates where available.
Examples to select
USDEURJapanese YenBritish PoundChinese Yuan
FX market cap context
Currency size metrics
Rate data where available
Fiat comparison links
Lookup card
Marketcaper Fiat Currency Scale Lookup
M
fiat currency catalogue
USD
FX market cap, M2 money-supply size, and rate context where available.
Compare by sizeOpen asset
What it does
One clear lookup purpose
The Money extension recognizes major fiat currency codes and names, then shows rate-adjusted money-supply size context without mixing in stock or crypto results.
Selected text
Local first, click to send
Selected text is inspected locally for a possible fiat currency catalogue match. It is sent to Marketcaper only after you click the icon or use the right-click lookup action.
Permissions
Only what the feature needs
Browser permissions support selection lookup, the context menu, saved preferences, and requests to Marketcaper. They are not used for ads or background page scraping.
Privacy
No account required
The extension does not require a Marketcaper account, does not sell selected text, and does not use selected text for advertising.
Review notes
Why the extension asks for browser permissions
Extension code is bundled in the browser package. Requests to Marketcaper return lookup data, not remote executable scripts.
Content script on webpages
Needed to place the small Marketcaper icon beside selected text. The extension filters selections locally and does not read whole pages.
Context menu
Adds the right-click Marketcaper lookup action for selected text when you prefer not to use the floating icon.
Storage
Remembers your enable or disable preference for selection detection on your browser.
Active tab and scripting
Supports the right-click fallback on the current tab when the content script needs to be loaded safely.
marketcaper.com access
Used only to request a category-scoped lookup after you click the icon or use the context-menu action.
FAQ
Questions before installing
How does Marketcaper calculate the money market-cap-like value?
For fiat currencies, Marketcaper uses a money-supply-derived size metric: FX Market Cap = Currency Money Supply M2 divided by the currency rate. That creates a market-cap-like value for comparing currencies by size.
Does the Money extension send every currency-looking word to Marketcaper?
No. The extension uses local selection checks first and only sends selected text after the user clicks the icon or context-menu action.
Can I compare USD with Bitcoin or GDP?
Yes. The fiat compare tool starts with fiat currencies and can unlock all categories for cross-market comparisons.
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