TransparentShort answer: in about two minutes you can drop a free fair-price calculator onto any WordPress page with one shortcode (or a block). A visitor types in the car and the asking price, and the calculator shows the market range comparable cars sell for and whether the price is fair, high or low, all without leaving your site.
It is the same calculator that sits on our fair-price checker. The engine doing the maths is our public API, built on market data from cars for sale in Portugal. No account, no key.
Who this is for
A used-car blog, a small dealer's site, an expat or community page, a forum: anyone whose readers buy used cars in Portugal and want a quick price check. When someone is looking at a listing and wonders "is this overpriced?", the calculator answers right there, on your page.
Installing the plugin
Today the plugin installs from a ZIP file. Its listing in the official WordPress directory is still pending, so you will not find it in the plugin search yet. Use the file instead.
- Download the ZIP from the repository:
github.com/transparentpt/wp. - In your WordPress admin, go to Plugins → Add New → Upload Plugin.
- Choose the ZIP file and click Install Now.
- Click Activate. There is nothing else to set up: no key, no account, no settings.
Placing the calculator on a page
There are two ways. The simplest is the shortcode, a small piece of code in square brackets that WordPress swaps for the calculator. Edit the page or post where you want it and type:
[transparentcars_calc]
Save, view the page, and the calculator appears. It is responsive, so it fits both phone and desktop.
If you use the block editor, there is an option with no typing at all: click add block, search for "TransparentCars Calculator" and insert it. It does exactly what the shortcode does.
Language and height
The shortcode takes two optional attributes. Use lang to set the calculator's language, and height to set its height in pixels, handy if your theme is narrower or wider than usual.
| Attribute | What it does | Example |
|---|---|---|
[transparentcars_calc] | Inserts the calculator with the defaults. | [transparentcars_calc] |
lang="pt" | Language: pt, en, ru or ua. | [transparentcars_calc lang="en"] |
height="640" | Height in pixels (default 640). | [transparentcars_calc height="640"] |
You can combine them: [transparentcars_calc lang="en" height="640"]. The available languages are Portuguese, English, Russian and Ukrainian.
What a visitor sees
Picture a reader looking at a 2014 Renault Clio with 120,000 km, advertised at 9,500 €. They enter make, model, year, mileage and the asking price. The calculator shows a band around 7,600 € to 9,870 €, with most comparable cars near 8,750 €. Verdict: on the high side, but still within range. The reader sees in seconds whether it is worth haggling.
Want to know how we reach those numbers? We explain it in how we build the price.
Honest notes
- Under the hood, the plugin shows our calculator inside an iframe that resizes its own height, plus a "Powered by transparent.pt" link. That link is part of the embed.
- The figures are estimates from public market data. They are not an official AT value or a certified appraisal.
- The plugin sets no cookies and collects no personal data. The only thing sent is the car details the visitor types, which go to the TransparentCars public API to compute the estimate.
Related tools
The same price base shows up elsewhere. You can put used cars in your ChatGPT, use the open price data via the API, or install the browser extension that shows the price as you browse. For the idea behind it all, read how to tell if a price is fair. And if you are a developer who wants to go deeper, start with the API documentation.