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I am not aware of any services but they have an API. I think it'd be skirting the tos to save it, but if this is just for personal use it might be ok.

https://www.zillow.com/howto/api/HomeValuationAPIOverview.ht...

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As far as general tracking of avms I don't know of any and the incentives are not properly aligned to have them set up (avm provider doesn't want to show inaccuracies).

Zillow used to show percentage error but it was a web page showing inaccuracies by zip.

I agree with the incentives part. But, apparently, some AVMs(not necessarily Zillow) are used by mortgage lenders to adjust their risk models. In such cases, I would assume lenders will first want to find out information about accuracy(through third parties).

You are right that zillow used to show accuracy by zip code. But I am looking for more granular info.

Sure, I bet the AVMs share their accuracy to people that pay them, but I bet not to folks who don't (consumers).

Anyway, hope this post turns up some useful info.

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