Access property AVM and tax assessment data via ATTOM API

Steps

1. Sign up for an ATTOM API key at the ATTOM developer portal and review the endpoint documentation for the property detail and AVM resources.
2. Look up a property by address using the property/basicprofile or property/detail endpoint, passing street address and zip code as query parameters to retrieve the ATTOM property identifier.
3. Call the AVM endpoint (e.g., avm/detail) with the ATTOM property ID to retrieve the automated valuation, confidence score, and high/low value range.
4. Retrieve tax assessment history from the assessment endpoint to get assessed value, tax year, and annual tax amount.
5. Parse the JSON response; ATTOM wraps all responses in a status object — check status.code equals 0 before processing the payload.
6. Cache results with a TTL appropriate to your use case (AVM data is typically refreshed monthly; tax data annually).