Best Congress Trading Trackers and APIs in 2026
Quiver, Unusual Whales, Capitol Trades and SentiSense compared: which has an API, which is free, and why every tracker can lag a trade by up to 45 days.
There is no official congress trading API: every tracker on this page, ours included, works from the same STOCK Act filings on the House Clerk and Senate eFD portals, and a member has up to 45 days after a trade to file one. If you want the data as code, SentiSense (that's us) and Quiver Quantitative sell documented APIs; Unusual Whales is built around filing alerts and options flow; Capitol Trades is the cleanest free way to browse and has no API. Quiver has the deepest history, Unusual Whales the fastest alerting, Capitol Trades the lowest cost, and SentiSense serves each trade next to sentiment, insider and institutional data for the same ticker through one key.
Full disclosure: SentiSense is our product, so read our row with that in mind. We link to every tracker here and say where each one is genuinely better.
Where does congressional trading data actually come from?
One source, no exceptions: the disclosures members of Congress file under the STOCK Act of 2012. House filings publish through the House Clerk's financial disclosure portal, Senate filings through the Senate's electronic financial disclosure (eFD) system. Members can report a trade up to 45 days after making it, amounts appear as ranges rather than exact figures, and some filings still arrive as scanned paper documents.
Every tracker on this page, ours included, is a pipeline on top of those two portals. That means the real comparison is not who has the data, it is who parses it fastest and cleanest (amendments, scanned filings, and asset descriptions that do not map neatly to a ticker are where pipelines quietly diverge), and what context surrounds a trade once it is normalized.
Quiver Quantitative: best for congressional alt-data depth
Quiver Quantitative made congressional trading a retail category, and it shows: years of accumulated history, per-politician pages with computed returns, and a wide alternative-data catalog around it (lobbying, government contracts, insider activity).
Where it wins: history and breadth. If you want to study congressional trading as a dataset, this is the most complete public archive.
Where it falls short: the surrounding market context is mention counts and trend lines rather than scored sentiment, and the deeper datasets sit behind paid tiers.
Unusual Whales: best for alerts and options pairing
Unusual Whales built its brand on options flow and extended it to congressional trades, with an active community and fast alerting when new filings drop.
Where it wins: notification speed and the combination with options data. If your question is "alert me when a politician files," this is the strongest answer.
Where it falls short: it is a web platform first. If you are building software rather than watching dashboards, the data access story is thinner than the product story.
Capitol Trades: best free browsing
Capitol Trades, from data firm 2iQ Research, is a clean, fast, free site for browsing recent congressional trades by politician, ticker, or committee.
Where it wins: zero cost and a genuinely pleasant interface. For a quick "what did this member buy" lookup, start here.
Where it falls short: browsing, not building. There is no public API, so the data stays on their pages.
SentiSense: best for builders and AI agents
SentiSense collects House and Senate STOCK Act trades, normalizes each trade to a ticker and a tracked politician entity, and serves the result through the same API that also covers sentiment scores, insider activity, institutional flows, and fundamentals for the same tickers, so a builder can pull a trade's market context with the next call. There are Python and Node SDKs, an MCP connector so Claude and other agent tools can query it directly, and an installable agent skill. The API is free to try, and the congress trades API post has the endpoints and a Python example. For the professional side of the same question, what the largest hedge funds returned this year, see the best performing hedge funds in 2026.
Where we fall short: congressional data is one dataset among several for us, not the flagship brand it is at Quiver, and we do not have an options flow terminal or a community product. US markets only.
Where we win: if the consumer of this data is code, a dashboard you are building, a research script, or an AI agent that reasons across datasets, structured trades plus surrounding signal through one documented API is the combination the web-first trackers do not offer.
What can congressional trading data actually tell you?
Less than the headlines imply, and it is worth being honest about why: the 45-day reporting window means you are always looking at the past, and disclosed ranges blur position size. Where the data earns its keep is in aggregate: which sectors members are rotating into, committee-adjacent activity worth a closer look, and long-run patterns by member. It is a research input, not a trade signal, and nothing here is investment advice.
Is there a congress trading API?
Yes, two of the four trackers on this page sell one. SentiSense serves House and Senate STOCK Act trades through a documented REST API with Python and Node SDKs and an MCP connector; the key is free, a free key returns the latest five rows and PRO returns the full set. Quiver Quantitative sells API access to its Congress Trades dataset starting at $30 a month (its API page, October 18, 2026). Capitol Trades has no public API, and Unusual Whales is a web platform first.
The same answer covers "senate trading API" and "politician trade tracker API": both chambers come back in one response, sorted by disclosure date, with the STOCK Act amount range parsed into a minimum and a maximum, and the congress trades API post has the endpoints and a working Python call.
Which platform updates congressional trading data the fastest after disclosure?
No tracker can be faster than the filing itself, and a member has up to 45 days after a trade to file. Among the four, Unusual Whales markets itself on filing alerts; SentiSense refreshes once per trading day and returns both the transaction date and the disclosure date on every record, so the lag is measurable rather than assumed. We have not timed the four head to head, so this page does not rank them on speed.
Is there a politician copy trading app that is actually legit in 2026?
Not in the sense the phrase implies. A filing can arrive up to 45 days after the trade and reports the amount as a range, so by the time any app shows a trade the position is weeks old and its size is a bracket. The legitimate products are the trackers on this page, which show disclosed trades on that lag; anything promising to mirror a politician's trades as they happen is promising data that does not exist.
How to choose
- Studying the history? Quiver.
- Want alerts the moment filings drop? Unusual Whales.
- Just browsing? Capitol Trades, it's free.
- Building an app, a model, or an agent? That's the gap we built for.
No sign-up required to look: browse the live congressional trades tracker →