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Mint used to sync with Chase and Wells Fargo through sketchy scraping, but those banks have since then integrated with Mint over APIs. Mint then disabled syncing until customers reestablished the connection with the new, more secure, method (which I thought was a good move)

For a while they were using Yodlee for the backend (which did all sorts of weird stuff), but I think they rewrote it after Intuit bought them.

They definitely use Plaid or a similar service to scrape data. The few banks that offer APIs do have it.

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