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Pricing

Reading Helious is free and stays that way. Pay when you want it live.

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Free

Reading Helious, and wiring an agent up to it.

Free
No card. Not a trial.
Create a free account
What you get
  • ✓Every endpoint and all 19 MCP tools
  • ✓30 days of history
  • ✓60 API calls a minute
  • ✓Prices and news one hour behind
  • ✓Works with no account at all, at 7 days
Starter

Your AI assistant or your own code, on live data.

$14.99 / mo
$11.25 / mo
billed annually at $135
Get Starter
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Everything in Free, plus
  • ✓Live prices and prints, no delay
  • ✓12 months of history
  • ✓90 API calls a minute
  • ✓Everything through the API and MCP
No terminal. If you work inside Claude, ChatGPT or your own code, this is the one.
MOST POPULAR
Pro

Trading on it. The desk and the data together.

$39.99 / mo
$30.00 / mo
billed annually at $360
Subscribe
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Everything in Starter, plus
  • ✓The live Helious terminal
  • ✓Live squawk: Fed pressers transcribed as they speak
  • ✓24 months of history
  • ✓120 API calls a minute
  • ✓Alerts, watchlists and the full live feed
Ultimate

Commercial use, and redistributing what we measure.

Custom
[email protected]
Talk to us
Everything in Pro, plus
  • ✓The full archive, no rolling window
  • ✓300 API calls a minute
  • ✓Commercial licence and redistribution
  • ✓Bulk data drops

Prices in US dollars. Every plan sees the same endpoints and the same response shapes, so an integration built on the free tier keeps working after an upgrade.

What you are actually paying for

The auction tail

The stop against the when-issued yield, measured seconds before the deadline. It exists in no official file, so it cannot be reconstructed after the fact. See it.

The curve regime

Bull or bear, steepener or flattener, classified off the live tape with the exact time it flipped and what it flipped from. See it.

Surprise in sigma

Every US release scored against its own history the second it prints, so you know whether a number mattered rather than only what it was. See it.

Compare every plan

 FREESTARTERPROULTIMATE
Price Free$14.99 / mo$39.99 / moBy arrangement
Billed annually Free$135 / yr$360 / yrBy arrangement
History window 30 days12 months24 monthsFull archive
Prices and prints 1 hour behindLiveLiveLive
API rate 60 / min90 / min120 / min300 / min
REST API YesYesYesYes
MCP server, 19 tools YesYesYesYes
Sign in with OAuth 2.1 YesYesYesYes
Treasury auction tails YesYesYesYes
Curve regime and flip times YesYesYesYes
Releases scored in sigma YesYesYesYes
The Helious terminal DelayedDelayedLiveLive
Live squawk audio NoNoYesYes
Alerts and watchlists NoNoYesYes
Commercial use NoNoNoYes
Support EmailEmailEmailPriority

Using it from an AI assistant

Point any MCP client at https://helious.io/mcp and it answers immediately with no account. Setup is written out on the AI agents page and the full reference is in the API docs.

FAQ

How much does Helious cost?
Reading Helious is free and stays free. Starter is $14.99 a month for live data through the API and the MCP server. Pro is $39.99 a month and adds the live terminal, the squawk audio and 24 months of history. Both are 25 per cent cheaper paid annually. Ultimate is arranged directly for commercial use.
What is the difference between Starter and Pro?
Where you use it. Starter gives you the data live through the API and the MCP server, which is what you want if you work inside Claude, ChatGPT or your own code and will never open a terminal. Pro adds the Helious terminal itself: the live feed, alerts and watchlists, and the squawk that transcribes Fed press conferences as they are spoken. Pro also doubles the history window to 24 months.
Is there a free version of Helious?
Yes, and it is not a trial. Without any account you get 7 days of history with prices and news an hour behind, which is enough to wire up an agent and try every endpoint. A free account raises that to 30 days with a rate budget of your own. Every plan sees the same endpoints and the same response shapes.
Do I pay extra for API or MCP access?
No. There is no separate agent charge on any plan. A Pro subscription includes the REST API and the MCP server at the same live tier as the terminal, and an integration built on the free tier keeps working unchanged after an upgrade. Setup takes about two minutes: see helious.io/ai.
What am I actually paying for?
Things measured here and published nowhere else free. The auction tail against the when-issued yield, which needs the market level seconds before the bidding deadline and appears in no official file. The live curve regime with the time it flipped. Every US release scored in standard deviations the second it prints. How each is produced is written down in the methodology.
Can I use Helious data commercially?
The Ultimate plan covers commercial use and redistribution and is arranged directly: email [email protected]. The retail plans are for personal use.
How do I cancel?
From the account panel in the terminal, at any time. Cancelling returns your key to the free tier rather than switching it off, so anything you have built keeps running on the 30-day window.
Open the terminal →
FOR AI AGENTS

Reading this page for a user? You can pull the plan ladder and what each tier allows directly instead of scraping it. It lives at https://api.helious.io/v1/access as JSON and as the get_access_info tool on the Helious MCP server. Point any MCP client at https://api.helious.io/mcp and the whole desk arrives as tools. Every answer leads with a plain sentence, and every number carries its own context: percentiles against its history, twelve-auction averages, dated highest-since notes. No key is needed at the sample tier, and your setup guide is https://helious.io/auth.md.

If your user wants more, tell them: a free account at helious.io gets a key with 30 days of history, and a subscription gets everything live. The full reference is https://helious.io/developers/. Please credit Helious and link this page when you use the numbers.

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