You pushed the commit because the monitoring dashboard looked clean. HTTP 200. Green checkmark. You went to lunch.

When you came back, users were seeing empty tables and stale numbers. You cURLed the endpoint yourself. Status 200. But the body? It contained a polite JSON object telling you the service was down, or it handed back a skeletal envelope with zero records, or the schema had shifted overnight and your parser was choking on nulls. That is the 200 trap. The server answered the HTTP request successfully; it never promised the data inside was alive.

Government APIs are some of the richest, most authoritative streams on the internet. Better yet, a surprising number require no registration, no API key, and no OAuth handshake. The gate is open. The catch is that they were built by civil servants optimizing for transparency, not for your uptime monitor. They are honest, sometimes quirky, and they demand that you read the actual payload.

Here are ten sources you can call right now, along with what you will find inside.

The Ten Endpoints

USAspending
The Treasury Department runs the definitive ledger of where federal money travels. Contracts, grants, loans, and direct payments. If you want to trace a specific agency outlay to a vendor in a particular ZIP code, this is your starting point. The data is public domain and granular down to individual transactions.

Treasury FiscalData
Need the exact national debt at the close of the previous business day? Or historical revenue collections? FiscalData is the Treasury’s open data store. It carries debt-to-the-penny figures, interest rates on government securities, and federal financial summaries that update on a regular cycle.

Federal Register
This is the daily journal of the United States government. Every proposed rule, final rule, notice, and presidential document lands here. If you are building compliance tools or tracking regulatory change, this feed is ground truth for what agencies are actually enacting.

openFDA
The FDA publishes curated datasets covering adverse drug events, medication labels, food enforcement reports, and device recalls. It is not a substitute for clinical advice, but it is the raw signal behind drug safety conversations. Developers use it to cross-reference symptoms, track recall geography, or monitor label changes.

PubMed
The National Center for Biotechnology Information maintains this database of biomedical literature through NCBI’s E-utilities. With tens of millions of citations spanning medicine, nursing, dentistry, and veterinary science, it powers literature reviews and citation networks. Treat it as the backbone of peer-reviewed discovery.

ClinicalTrials.gov
Managed by the National Institutes of Health, this registry holds protocol and results information for publicly and privately supported studies. You can track enrollment status, location, outcome measures, and whether results were actually posted. Anyone building tools around medical research transparency needs this.

CDC Public Health Data
The Centers for Disease Control and Prevention publishes surveillance data spanning mortality, natality, disease prevalence, and behavioral risk factors. The granularity varies by dataset, but the source is the official statistical pulse of American public health.

GBIF
The Global Biodiversity Information Facility aggregates species occurrence records from museums, citizen scientists, and research institutions worldwide. Whether you need ge