---
title: "Helious A2A Agent: Market Data for Agents"
description: "Connect an A2A client to the Helious desk: US Treasury yields, scored releases, auction results, Fed rate-cut odds and FX, answered in plain words."
source: Helious
canonical: "https://helious.io/a2a"
---

# Helious A2A agent


      This URL is an Agent-to-Agent (A2A) endpoint. Point an A2A client at it and ask the Helious
      desk about US markets in plain words: Treasury yields and the curve regime, the economic
      calendar with surprise scoring in standard deviations, auction results including the tail,
      Fed rate-cut odds, FX momentum, the volatility board and cross-asset correlations. Every
      answer comes back as a plain sentence with the source page beside it.



      You do not need a key to start. The sample tier answers without one.




## Connect




      Agent URL
      https://helious.io/a2a

      Transport
      JSON-RPC over HTTPS

      Auth
      X-Api-Key or OAuth, or none on the sample tier

      Agent card
      https://helious.io/.well-known/agent-card.json



      An A2A client reads the agent card first and finds this URL inside it, so pointing the client
      at [https://helious.io/.well-known/agent-card.json](https://helious.io/.well-known/agent-card.json) is enough. The same desk is reachable as
      an MCP server at [https://helious.io/mcp](https://helious.io/mcp). The full reference at
      [https://helious.io/developers/](https://helious.io/developers/) covers how to mint a
      key and what each plan opens up. Agents can read the short setup guide at
      [https://helious.io/auth.md](https://helious.io/auth.md) themselves.





## The 19 skills






- `market-context`
        **Why the market is moving**
        The whole cross-asset board (equities, the Treasury curve, FX, volatility, commodities), the scored economic releases behind it, the Helious desk's read on what is driving the session (event-driven, flow-driven or quiet), and the regime yields and stocks have actually been trading in.


- `us-treasury-rates`
        **US Treasury rates and the curve**
        Treasury yields, the 2s10s and other spreads, and whether the curve is bull or bear steepening or flattening right now.


- `treasury-curve-full`
        **The whole Treasury curve**
        Every point on the US Treasury curve from the 3 month bill to the 30 year bond, with the session's daily closes.


- `economic-calendar`
        **Economic calendar and scored releases**
        Economic releases with forecast, prior and the actual once it prints, plus Fed speakers and auction times, for the US, euro area, UK and Japan.


- `economic-series`
        **One economic series in depth**
        A single US economic series such as CPI or nonfarm payrolls: the latest print, the forecast, the surprise in standard deviations, and the history.


- `treasury-auctions`
        **US Treasury auction results**
        Auction results including high yield, bid-to-cover, the tail against the when-issued yield, and the buyer split.


- `fx-momentum`
        **FX momentum board**
        Seven major currencies scored for momentum against the basket, newest reading plus the recent boards.


- `volatility`
        **Implied volatility board**
        VIX and the other implied volatility gauges with their one year percentile.


- `correlations`
        **Cross-asset correlations**
        Correlation matrix across stocks, bonds, the dollar, gold and oil over 30 to 120 day windows.


- `hormuz-transits`
        **Strait of Hormuz shipping**
        Ships through the Strait of Hormuz per day, split tanker and cargo, measured first-hand from live ship tracking.


- `nasdaq-100`
        **NASDAQ-100 session board and single names**
        The NASDAQ-100 ranked best to worst on the session, or one company's price, session move and rank on the board. Covers every NDX constituent by ticker.


- `earnings`
        **Mega-cap earnings dates and EPS**
        When a US mega-cap reports, whether the date is confirmed, whether it prints before the open or after the close, the consensus EPS, and the reported EPS with its beat or miss once it lands.


- `fed-roster`
        **The FOMC roster**
        Who sits on the FOMC, who votes this year, their lean, and their upcoming speeches.


- `desk-feed`
        **The Helious feed**
        What Helious has published (releases with their surprise, auction results, board updates, the daily brief and live squawk lines) and the wire headlines it carries, each with a score for bonds and one for stocks and Helious's plain-English read, and no headline naming its outlet.


- `live-events`
        **Transcribed live events**
        Live events Helious transcribed in the last week, such as Fed press conferences and briefings.


- `yield-closes`
        **Official yield closes**
        The 17:00 New York Treasury yield close for each session, as Helious recorded it at the time.


- `curve-history`
        **Curve regime history**
        Every past curve regime flip with its time, what it flipped from, and how that session closed.


- `series-index`
        **Which series Helious tracks**
        Every US economic series Helious tracks, with the slug used to ask for one.


- `access-and-plans`
        **Plans, limits and how to get more**
        What the caller's current tier allows, the full plan ladder, and the exact steps a person takes to get more.





      If you are sending JSON-RPC rather than reading, POST to this same URL. A GET that asks for
      application/json comes back 405 with
      allow: POST, because the agent is
      stateless and holds no session to stream over.


    [Open the terminal →](https://helious.io/)