# Helious

**Canonical:** https://apis.io/providers/helious-io/  
**Website:** https://helious.io/  
**APIs profiled:** 1

Helious provides a live US market news terminal delivering real‑time economic calendar events, Treasury auction results, and release forecasts. Users can view live squawk, score releases against consensus instantly, and track yield curves and Fed speaker commentary, all without a subscription card.

## Kin Score — 51.4 / 100 (developing)

Scored 2026-11-13 under rubric 0.28.0.

| Facet | Score |
|---|---|
| Discoverability | 76.7 |
| Contract Quality | 62.0 |
| Contract Governance | 22.0 |
| Operational Transparency | 28.6 |
| Developer Ergonomics | 63.6 |
| Access Clarity | 34.0 |

Regulatory layer — **Securities & Market Data**: 36.1 (matched via tags).

## Agent readiness — 51.2 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | served |
| Idempotency | no |
| Error Semantics | derived |
| OpenAPI Examples | partial |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | conformant |
| Dry Run Mode | no |
| Delegated Identity | served |
| Protected Resource Metadata | verified |
| Dynamic Client Registration | yes |
| Agentic Commerce | no |
| Pagination Ratio | no |
| Operation Distinctiveness | distinct |
| MCP Tool Quality | na |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: medium).

## APIs (12)

- **Helious Agent sign-in and A2A API** — OAuth 2.1 so an agent can act for a person without a pasted key, and the agent-to-agent endpoint for asking the desk a question in plain words.
- **Helious Ask Helious API** — The Ask Helious API from Helious — 1 operation(s) for ask helious.
- **Helious Boards API** — The FX momentum, implied volatility, correlation and Hormuz boards: newest reading plus history.
- **Helious Economic data API** — Every tracked US economic series, the calendar, and release prints with their surprise scores.
- **Helious News and feed API** — The Helious feed: the news wire and the desk's own posts, each with a score for bonds and one for stocks.
- **Helious Rates and curve API** — Live Treasury yields, spreads, the curve regime and its history.
- **Helious Reference API** — Glossary, the measured capture latency and supporting reference data.
- **Helious Series API** — The Series API from Helious — 2 operation(s) for series.
- **Helious The Fed API** — FOMC meetings, the roster and upcoming speakers.
- **Helious The squawk API** — The The squawk API from Helious — 2 operation(s) for the squawk.
- **Helious Treasury auctions API** — Auction results by tenor, with the tail against the when-issued yield.
- **Helious Your key API** — What your key is and what it may do.

## MCP servers (1)

- **Helious MCP Server** — Remote MCP server at helious.io.

## Agentic access (1)

- **Helious Agentic Access** — 66 operations · 6 acting · 1 human-in-the-loop

## Security (3)

- **Helious Authentication** — 3 schemes
- **Helious Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Helious Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Helious Plans Pricing**

## Tags

Finance, Market Data, News, Economic Calendar, Treasury

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/helious-io/). Scores are computed from the provider's own public artifacts under a published rubric.