For Professionals

Tax-sale intelligence for platforms, investors and research teams

Structured access to 51 jurisdiction profiles, county competition scores and 198,258 published tax lien, tax deed and foreclosure parcels — live today, not a waitlist.

GET /api/v1/states

Statutory return, redemption period, bid method and the TaxLienSimple Index score for all 51 jurisdictions. Public.

GET /api/v1/counties

County-level competition band and inventory counts — no owner PII. Public.

GET /api/v1/parcels

Parcel-level data, JSON or CSV. Requires an API key — no owner-contact fields exposed.

Example — GET /api/v1/states (one row from the response)

{
  "state": "Illinois",
  "slug": "illinois",
  "system": "lien",
  "investor_accessible": true,
  "max_rate": "9% max penalty bid per 6-month period (P.A. 102-363, eff. 1-1-2022)",
  "redemption_period": "36mo (3yr) default, 1yr vacant/commercial",
  "auction_format": "Scavenger sale",
  "statute_citation": "35 ILCS 200/21-215",
  "official_source_url": "https://ilga.gov/documents/legislation/ilcs/documents/003502000K21-215.htm",
  "tls_index_score": 48,
  "verified": true
}

Example — GET /api/v1/counties?state=Texas (one row)

{
  "state": "Texas",
  "county": "Travis",
  "competition_score": 64.4,
  "competition_band": "High",
  "online_auctions": true,
  "parcels": 4,
  "lien_share": 0
}

Both are exact response shapes from the live endpoints, not illustrative. Full parameters and every field are documented on the developer docs page.

Who it's for

Auction platforms

Enrich your own listings with statutory terms and competition context.

Title companies

Pull structured parcel and jurisdiction data into your own workflow.

Newsletters & researchers

Cite verified, source-linked figures instead of re-typing state tables.

Investment teams

Bulk pull inventory across counties without scraping.

Data providers

License structured tax-sale data instead of building your own pipeline.

Developers

REST, JSON, CSV. Full docs and rate limits below.

Get access

/api/v1/states and /api/v1/counties are public today. Keyed access to /api/v1/parcels (JSON/CSV, rate-limited) is included on the Unlimited plan — generate a key from your account once subscribed.

Read the full API docs See plans

Need something beyond the current API — bulk licensing, SFTP delivery, or a change-event webhook?

Tell us your use case and we'll reach out as those data products come online.

Email data@taxliensimple.com