This extension is not functioning properly since Mint's recent website update. I am looking into a fix and will keep this section updated.
Update (July 12, 2022): I have not found a way to get certain critical functions of the extension working with the changes Mint has made to their website. I fear it may be a wrap on Mint Crypto 😔.
Mint Crypto is a Chrome extension designed to easily keep the value of your cryptocurrency updated in your Mint account. Mint Crypto makes it easy to add crypto to Mint that you own in places that can't be added to Mint natively, such as crypto wallets and many crypto exchanges.
To use Mint Crypto, all you have to do is enter the symbol and quantity of your crypto(s) while logged into Mint, click Sync, and Mint Crypto will create or edit a custom asset/property in Mint called "Cryptocurrency" with the current value of your crypto. After first-time setup, Mint Crypto will automatically update your account with the current value of your crypto in a new tab every time you log into Mint as long as it has more than than 30 minutes since your last sync.
You can still use the pop-up window after first-time setup if you want to 1) modify your holdings or 2) force a sync.
Mint Crypto uses the Binance API to get crypto price data, meaning that Mint Crypto supports any coins that Binance supports (350+).
As of version 1.0.3, Mint Crypto uses The Free Currency Converter API to convert from USD to other currencies such as CAD or EUR if a user selects a non-USD currency.
This extension is built off of lxieyang's Chrome Extension Boilerplate with React 17 and Webpack 5
- If you change the name of the custom property in Mint.com from "Cryptocurrency", the extension will not work
- Coins must be entered as their symbol, e.g. must be "BTC" not "Bitcoin"
- Currently, if you want to change your crypto holdings, you first need to let the extension run an automatic sync, then you can interact with the extension pop-up (via toolbar icon) after the automatic sync has completed. In a future update, I will add an way to circumvent this by manually aborting the automatic update.
Currently available in the Chrome Web Store
This extension, like any Chrome Extension, is split into three parts: a popup script, a content script, and a background script.
The popup script defines the visual part of the extension-- the popup window that you see when you click the extension icon in the toolbar.
The popup script itself cannot interact with a website, it can only gather information from the user and send messages to the content and background scripts.
When a user clicks the Sync button, a message is sent to the content script (using chrome.tabs.sendMessage) with an array of all the coin objects and the user's preferred currency. An object might look like {name: "BTC", quantity: 0.5}. The popup script also save's the user's coin data locally to chrome.storage so that Mint Crypto can run automatic syncs whenever the user logs in.
Note: The popup form can only be submitted if all the inputs are valid:
- An input in the "Name" field is valid if it matches a symbol in Binance's list of supported coins, which is fetched from the Binance API when the popup is opened and stored in an array.
- An input in the "Quantity" field is valid if it is a valid number (!isNaN) and greater than 0.
The content script runs on any Chrome tab that is on Mint.com. It is the only script that can directly interact with a web page and do things like fill out forms and click buttons.
The content script will receive a message from background or popup scripts saying "Hey, please update the user's Mint account." The content script then takes the user's coin info and calculates the value of the coin(s) using the Binance API. The content script will then interact with Mint.com and click through the process of either creating (on first-time setup) or editing a property/asset named "Cryptocurrency" with the calculated value. (If the user selects a currency that is not USD, the content script will also make a call to The Free Currency Converter API to convert the USD value to another currency.
The content script also displays either a "syncing" or "sync complete" message in the top right of the page.
The background script has the highest-level access out of all the parts of a Chrome extension. It can do things like open and close a new tab. The background script is always running, whereas the popup script can only run when the popup is open and the content script can only run on tabs that are on Mint.com (as specified in the host permissions in the manifest.json file).
Below is a flowchart describing the logic flow of how/when Mint Crypto performs an automatic sync.
The extension runs locally on your machine only. Mint Crypto does not collect or share any information.
1.0.1 - Mint Crypto now syncs automatically in a new tab when user logs into Mint
1.0.2 - Removed tabs permission. This was used to determine when user was logged into mint but resulted in a message to the user when installing that said the extension could "Read your browsing history." Reworked the extension to determine when logged into mint without using chrome.tabs.URL
1.0.3 - Added support for the following currencies: CAD, AUD, EUR, CNY, JPY, INR, GBP, MXN, and CHF
I created the Mint Crypto logo using Inkscape, and the promo images (example below) using Figma
