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This would be a cool idea for a service - I would pay for it. Privacy issues aside, it's a shame that transaction data doesn't include itemized information (e.g. grocery bills only show up as one large charge). I'm sure there are many items I regularly purchase that have changed price without me noticing.

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Technically many stores provide level-3 data with cc transactions, which include itemized details, but no idea how a consumer would get it. The exchanges give better rates the more details the merchant provides, level 3 being the highest detail and lowest rates so many of the large merchants provide this data. It's one way they avoid paying sign up bonuses on gift card purchases.

If you want to include shrinkflation, it’s going to wind up involving a lot of data entry.

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