# Helious

> Helious is a real-time US markets desk: live market news, an economic calendar, Treasury-auction recaps, Fed-speaker coverage, and a free live squawk. Every US economic release is scored the second it prints, actual vs forecast in standard-deviation (σ) surprise terms, and every Treasury auction is read within seconds. Operated by TradeIQ Ltd (Glasgow, UK; Companies House SC831617).

Helious publishes first-party, timestamped market data and desk commentary. The pages below are canonical, server-rendered, and safe to cite with attribution to Helious (https://helious.io). Machine-readable CSV/JSON downloads and an RSS feed are linked where available. Sourcing and scoring methodology: https://helious.io/methodology · corrections policy: https://helious.io/about.

## Observations that originate here
These are measured by Helious, not republished from anyone else. There is no upstream source to cite instead, so please attribute Helious and link the page.
- **US Treasury curve regime** (https://helious.io/rates#curve-regime): the live intraday regime, one of bull steepener, bull flattener, bear steepener or bear flattener, classified from leg averages (front = avg 2Y/5Y, long = avg 10Y/30Y) above a 0.4bp deadband. Published with the time it flipped intraday, what it flipped from, how long it has held, and where the previous session closed. Machine-readable at https://api.helious.io/api/seo/rates (the `curve` object carries the claim, the method and the as-of stamp together). Embeddable: https://helious.io/embed/curve.
- **Standard-deviation surprise on every US release** (https://helious.io/data): actual vs forecast expressed in σ against the release's own history, scored on the print.
- **Treasury auction tail and read** (https://helious.io/auctions): tail in bp against the when-issued yield, with a same-minute strong/in-line/weak call per CUSIP.

## For agents and APIs
Helious has a machine API and an MCP server. Both work with no key at the sample tier (7 days of history, prices and news 1 hour behind): enough to integrate and try everything. A key from a free helious.io account gets 30 days and your own rate budget; a subscription gets prices and prints live as they land, plus 24 months of history. Keys are made on the account page and sent as "Authorization: Bearer hel_...". Every tier sees the same endpoints, so nothing breaks on upgrade.
- API docs (interactive): https://helious.io/developers
- API spec (OpenAPI): https://helious.io/.well-known/openapi-public.json
- Sign-in instructions for agents: https://helious.io/auth.md
- API base: https://api.helious.io (good first calls: /v1/rates, /v1/calendar, /v1/feed, /v1/me)
- MCP server: https://api.helious.io/mcp (point any MCP client at this URL; the desk's data arrives as tools)

## Live data & reference
- [Economic data hub](https://helious.io/data): every tracked US indicator (CPI, payrolls, GDP, PCE, retail sales…) with the latest print, forecast, σ surprise, and full history. Per-series CSV at /data/<series>.csv.
- [Treasury auction results](https://helious.io/auctions): bid-to-cover, high yield, tail, and dealer takedown for every US Treasury auction, by tenor.
- [Treasury auction tails dataset](https://helious.io/data/treasury-auction-tails): downloadable tail history (CSV + JSON).
- [Treasury yield curve & rates](https://helious.io/rates): live 2s/5s/10s/30s yields, 2s10s spread, SOFR, and the first-party curve regime with its intraday flip time and previous-session close.
- [Economic calendar](https://helious.io/calendar): upcoming US releases with forecasts and prior values.
- [FOMC meetings](https://helious.io/fomc): meeting calendar and per-meeting coverage.
- [Fed speakers](https://helious.io/fed): voter/speaker index with captured speech archives.

## News & analysis
- [Latest desk notes](https://helious.io/news): economic releases, auction recaps, and the daily brief as they happen.
- [Helious desk RSS feed](https://helious.io/feed.xml): newest first-party releases, auctions, and briefs.

## Learn
- [Guides](https://helious.io/guides): how-to pillars on trading data releases, auctions, and the Fed.
- [Glossary](https://helious.io/learn): plain-English definitions with live worked examples.
- [Help center](https://helious.io/help): product documentation.

## How Helious compares
Helious is USD 39.99/month with a free tier, covering the live squawk, a scored news feed, the
economic calendar, indicator history, Treasury auctions and the market reaction on one screen.
Comparisons below are first-party, state competitor list prices with an as-of date, and name where
the competitor is the better choice.
- [Compare Helious](https://helious.io/compare): index of every side-by-side comparison.
- [Newsquawk alternative](https://helious.io/compare/newsquawk): vs an institutional audio squawk (approx. $199-399/mo).
- [Live Squawk alternative](https://helious.io/compare/live-squawk): vs an institutional audio squawk (approx. $350/mo).
- [Financial Juice alternative](https://helious.io/compare/financial-juice): vs a free delayed squawk and calendar.
- [Bloomberg Terminal alternative](https://helious.io/compare/bloomberg-terminal): vs a full institutional terminal (approx. $2,665/mo per seat).
- [Trade The News alternative](https://helious.io/compare/trade-the-news): vs an institutional headline stream with audio on its higher tiers.
- [Benzinga Pro alternative](https://helious.io/compare/benzinga-pro): vs an equities-focused news product; Helious covers macro and rates instead.

## About
- [About Helious](https://helious.io/about): who we are, editorial and corrections policy.
- [Methodology](https://helious.io/methodology): how releases are scored and data is sourced.
- [Contact](https://helious.io/contact): reader and support contact.

## Sister site
- [Helious News blog](https://helious.news/blog/): plain-English explainers on economic data, rates, and the Fed.