Is there an API for Form 5500 filings?
The DOL offers the EFAST2 web search and bulk dataset files, not a query API; the Olympus Form 5500 API returns an employer's plans and Form 5500 / 5500-SF filings by sponsor EIN as JSON.
Answers
Is there an API for that?
Each page answers one question in its first sentence, links the official source and says what the official route lacks. Longer walkthroughs are in the guides.
APIs
Is there an API for IRS Form 990 data?
The IRS publishes Form 990 data as a web search and bulk files, not a query API; the Olympus Nonprofit Financial Data API returns Form 990, 990-EZ and 990-PF figures by EIN as JSON.
Is there an API for UK premises licences?
No central API: each council keeps its own Licensing Act 2003 register; the Olympus UK Premises Licensing API serves the open registers of four councils in one schema, with organisation holders only.
Is there an API for Census demographics by ZIP code?
Yes: the Census Data API serves ACS 5-year estimates by ZCTA with a free key and coded variables; the Olympus Geographic & Demographics API serves them by ZCTA as named JSON fields with margins of error and vintage.
Is there an API for UK council spending over £500?
No government API spans councils: each English council publishes its own spending-over-£500 files; the Olympus UK Council Spending API puts the councils it covers into one schema, searchable by council, supplier, date and amount.
Is there an API for city capital improvement plans?
No national register exists: each US city or county publishes its own capital budget or CIP; the Olympus US Municipal Capital Projects API maps 15 of them into one schema, with the source row or PDF page behind every amount.
Is there an API for Find a Tender and Contracts Finder?
Yes: Find a Tender and Contracts Finder each publish OCDS JSON APIs, filtered by date and stage; the Olympus UK Public Procurement API serves both in one schema, searchable by buyer, supplier Companies House number, CPV, value and date.
Is there an API for sales tax rates by address?
SST states publish rate and boundary files, not a lookup API; the Olympus Sales Tax Rates API returns the published jurisdiction rates for an address or ZIP+4 in the states it covers (a rate lookup, not a tax calculation).
Is there an API for SEC EDGAR filings and XBRL financials?
Yes: data.sec.gov serves EDGAR filings and XBRL facts as JSON, free and keyless, as each company tagged them; the Olympus SEC API adds eight standardised metrics with history, restatement flags and comparison.
Questions about the data
Contracts Finder vs Find a Tender
Since 24 February 2025 Find a Tender carries notices for new UK procurements above and below threshold; Contracts Finder carries only award notices of procurements started under the earlier regulations.
How to find out who won a public tender (UK)
Search Find a Tender for the contract award notice (UK6) and contract details notice (UK7), or Contracts Finder for awards under the earlier regulations; the Olympus UK Public Procurement API searches awards from both by supplier, buyer, CPV and value.
How to read a Form 990
Read Part I (Summary), then Part VIII (revenue), Part IX (functional expenses: program, management and general, fundraising), Part X (balance sheet) and Part VII (compensation).
Who must file a Form 5500?
ERISA pension and welfare plans file a Form 5500 every year; small unfunded or fully insured welfare plans (under 100 participants) are exempt, eligible small plans may use the 5500-SF, and one-participant plans file the 5500-EZ.
Does the SEC EDGAR API need a key?
No key: data.sec.gov is free and keyless; the SEC asks for at most 10 requests a second with a User-Agent naming you and a contact email.
Can you look up sales tax by ZIP code?
Only roughly: a 5-digit ZIP can span several jurisdictions and rates; use a ZIP+4 or the street address, as the SST boundary files do.
Are WARN notices public record?
There is no federal WARN database; employers notify the state, and many states publish the notices they receive, voluntarily and each in its own format.
OIG vs SAM exclusion lists
The OIG LEIE lists only HHS OIG's exclusions from federal health care programs; SAM.gov lists exclusions from many federal agencies, OIG's included, for contracts and assistance.
What is a CAGE code, and is a UEI public?
A CAGE code is a five-character DLA identifier for an entity's facility, assigned during SAM.gov registration; a UEI is SAM.gov's twelve-character entity ID, public unless the entity opts out of public display.