ATTOM API
ATTOM's property data API providing comprehensive U.S. real estate data including property details, AVM valuations, tax assessments, deed transfers, foreclosure data, school information, and neighborhood statistics for proptech and real estate agent workflows.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
TLS enforced. API key auth is simple but account-level — no fine-grained scoping. Separate API keys per data product provide partial segmentation. No OAuth2 or token rotation support. SOC2 certified.
⚡ Reliability
Best When
You need comprehensive, standardized U.S. property data — including AVM, tax records, and deed history — for proptech automation, investment analysis, or real estate underwriting workflows.
Avoid When
You need live MLS listings, international property coverage, or are building a consumer product without the budget for ATTOM's commercial licensing.
Use Cases
- • Retrieving property valuations (AVM) and tax assessment data for automated underwriting or investment analysis
- • Pulling deed transfer history and ownership records for due diligence automation
- • Enriching property records with school ratings, walkability scores, and neighborhood demographics
- • Building foreclosure and distressed asset identification pipelines for real estate investors
- • Generating comparable sales (comps) data for automated property valuation models
Not For
- • Real-time MLS listing data — ATTOM is not a live listings feed
- • International property data — coverage is U.S. only
- • Consumer-facing applications without proper data licensing agreements
Interface
Authentication
API key authentication via apikey header on all requests. API keys are provisioned through the ATTOM developer portal after account approval. Keys are account-level — no per-user scoping. Separate API keys available per data product bundle.
Pricing
Pricing is tiered by call volume and data product (AVM, deed, tax, foreclosure, etc. are separate products/licenses). Enterprise contracts required for high volume or embedded use cases. Free trial is useful for evaluation but insufficient for production.
Agent Metadata
Known Gotchas
- ⚠ Property lookups require either ATTOM ID, address components, or APN — agents must standardize address inputs before querying
- ⚠ Some endpoints return HTTP 200 with an empty status code in the body for not-found properties — agents must check response body, not just HTTP status
- ⚠ Data freshness varies by product — AVM and tax data may lag by weeks; agents should not assume real-time accuracy
- ⚠ Each data product (AVM, deed, tax, school, foreclosure) may require separate API key entitlements — unauthorized product access returns 401 without clear explanation
- ⚠ Rate limits are not consistently returned in response headers — agents must implement conservative throttling to avoid 429 errors
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-06.