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The Colorado Secretary of State records the liens filed against Colorado businesses and people: UCC financing statements that secure a loan or a lease on a debtor’s assets, and federal tax, hospital and other statutory liens. Every filing since 1966 is kept, in any status, with its amendments, continuations and terminations, the debtors and secured parties it lists, and the collateral it describes. A lien is its initial filing and every filing that names it, and whether it is still in force is computed each time you ask. Brought up to date daily.
The whole source, organized and ready to query: every endpoint on this page answers in milliseconds. Every response carries as_of: how current the data is. How datasets work.

Find liens against a debtor

POST /us/colorado-ucc/debtors-search/v1 Dataset Searches the debtors by name, or by a Colorado entity’s id.
Returns as_of, query, organization_id, total, page, per_page, total_pages, count and debtors[], by name. Every listing carries its id (debtor_id or secured_party_id), file_id, name, organization_name, first_name, middle_name, last_name, suffix and address ({ line_1, line_2, city, state, zip, zip_4, country }), and action_type and record_status (whether the listing is current, not the lien). A debtor also carries organization_type, organization_jurisdiction, organization_id (for a Colorado entity, often its Secretary of State id) and description; a secured party carries assignor. Debtors include people, with their addresses, as the filings list them. Each carries filing ({ filing_number, transaction_type, document_type, filing_date }, the filing that lists it) and lien ({ initial_filing_number, filing_type, filed_date, filings, lapse_date, terminated, in_force }). in_force is computed by Croma when the response is served: false once a filing terminated the lien or its lapse date has passed, true while neither, and null when the lien has no lapse date and no termination, as for most federal tax and hospital liens.

Find the liens a lender holds

POST /us/colorado-ucc/secured-parties-search/v1 Dataset Searches the secured parties by name. The filers spell a lender many ways (Wells Fargo Bank, N.A., WELLS FARGO BANK, NATIONAL ASSOCIATION); search the distinctive words.
Returns as_of, query, total, page, per_page, total_pages, count and secured_parties[], by name. Every listing carries its id (debtor_id or secured_party_id), file_id, name, organization_name, first_name, middle_name, last_name, suffix and address ({ line_1, line_2, city, state, zip, zip_4, country }), and action_type and record_status (whether the listing is current, not the lien). A debtor also carries organization_type, organization_jurisdiction, organization_id (for a Colorado entity, often its Secretary of State id) and description; a secured party carries assignor. Debtors include people, with their addresses, as the filings list them. Each carries filing ({ filing_number, transaction_type, document_type, filing_date }, the filing that lists it) and lien ({ initial_filing_number, filing_type, filed_date, filings, lapse_date, terminated, in_force }). in_force is computed by Croma when the response is served: false once a filing terminated the lien or its lapse date has passed, true while neither, and null when the lien has no lapse date and no termination, as for most federal tax and hospital liens.

One lien, whole

POST /us/colorado-ucc/lien/v1 Dataset Resolves a lien by any of its filing numbers.
Returns found, filing_number, as_of and lien (null when not found): initial_filing_number, filing_type (e.g. ucc, lien_irs, lien_hosp, efs), filed_date, lapse_date, terminated, in_force, filings[] oldest first (each { file_id, filing_number, initial_filing_number, transaction_type, filing_type, document_type, financial_statement_type, filing_date, lapse_date, continuation, termination, manufactured_home }), debtors[], secured_parties[] and collateral[] (each { collateral_id, file_id, description, additional_description, county, farm_product, ... }, additional_description being the filer’s own text), up to 1,000 of each, with their totals.

Full reference

Schemas, all response fields, and an interactive playground.