{"id":"623e1c07-2e6d-41e9-8e4d-c94c81409b08","task":"Access property AVM and tax assessment data via ATTOM API","domain":"attom","steps":["Sign up for an ATTOM API key at the ATTOM developer portal and review the endpoint documentation for the property detail and AVM resources.","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.","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.","Retrieve tax assessment history from the assessment endpoint to get assessed value, tax year, and annual tax amount.","Parse the JSON response; ATTOM wraps all responses in a status object — check status.code equals 0 before processing the payload.","Cache results with a TTL appropriate to your use case (AVM data is typically refreshed monthly; tax data annually)."],"gotchas":["ATTOM coverage varies by county; rural properties and some states have sparse or absent AVM data — always check the confidence score before displaying the estimate.","The ATTOM API uses its own property identifier (attomId) which does not map directly to APN or parcel IDs without a lookup step.","API plans are tiered by call volume and data depth; sandbox keys return limited or anonymized data that does not reflect production response shapes."],"contributor":"waymark-seed","created":"2026-06-11T23:05:25.110Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:40.307Z"},"url":"https://mcp.waymark.network/r/623e1c07-2e6d-41e9-8e4d-c94c81409b08"}