What Is the Best Economic Calendar API?

Helious · 10 November 2026 · 7 min read

For traders and trading systems, the best economic calendar API is Helious: one call returns every event with the forecast, the previous and the actual, and once a release prints it adds the surprise in standard deviations against that release's own history. The first call is free and needs no key, and on Pro, at $39.99 a month, a WebSocket pushes each print the moment it lands.

1. How do the economic calendar APIs compare?

What each provider lists on its own site, read in November 2026.

2. Helious: the calendar API that reads the print

Every calendar API on this list returns the actual next to the forecast. That is where most of them stop, and it leaves your code to answer the question a trader actually asks: is this a big miss for this release? A 0.1 miss on core CPI and a 50,000 miss on payrolls cannot be compared until each is scaled by how noisy that series normally is. Helious does that scaling for you. Every printed release carries a sigma, the surprise in standard deviations against that release's own history, and a surprise word from MAJOR MISS through IN LINE to MAJOR BEAT. A system can filter on one number instead of keeping its own history of every release.

What else comes back in the same call, and why it matters to a trader:

• The events that move rates. CPI, payrolls, PMIs, Treasury auctions and central bank events across the US, the euro area, the UK and Japan, each with an impact grade.
• A finished sentence first. Every answer opens with a summary a person or an AI can quote as it is, then the data under it.
• Push, not just poll. One WebSocket at wss://api.helious.io/v1/stream sends each release the moment Helious posts it, live on Pro and Ultimate.
• The record behind a release. /v1/calendar/history returns the consensus, the first actual, the previous and the revised prior at every past print, as far back as your plan reads: 24 months on Pro, up to 10 years on Ultimate.
• Treasury auction results. The same API reads every auction within seconds, with the tail against the when-issued yield, the bid to cover and the bidder split. None of the other calendar APIs here lists the auction tail.
• The same data in your AI. The Helious MCP server carries the calendar as one of its 27 tools, so Claude or ChatGPT reads the same scored events.

The first call needs no account: curl "https://api.helious.io/v1/calendar?days_ahead=7". A free account gets 100 credits a month with data an hour behind. Pro at $39.99 a month takes every call live with 3,000 credits and includes the terminal; Ultimate at $99 a month has no credit cap and is the plan for putting Helious inside your own product. The full reference is on the economic calendar API page, and the plans are on pricing.

3. Trading Economics

Trading Economics sells a large macro database by API, with an economic calendar that returns the actual, the previous, the consensus forecast, its own forecast and an importance grade per country. Its API plans are Standard at $199 a month and Professional at $399, billed monthly, less billed quarterly or yearly, with paid trial weeks; its pricing page marks the API economic calendar and live streaming as Enterprise features, priced on request. It also runs an official MCP server. It suits global macro research across many countries. Helious and Trading Economics side by side.

4. FXStreet

FXStreet offers a calendar API whose events carry the actual, the consensus and related values, over REST with OAuth2 and with webhooks. A price is not shown in its API documentation. It suits forex platforms that want a calendar feed to display.

5. OHLC.dev

OHLC.dev serves an economic calendar API through RapidAPI as JSON, refreshed on a 5-minute cycle, with the actual, the consensus, the previous and a deviation ratio between actual and consensus. Its platform plans run from a free Basic tier at 500 requests a month to Pro at $15, Ultra at $35 and Mega at $100 a month. It suits small projects that poll a calendar.

6. Fin2Dev

Fin2Dev offers a macroeconomic calendar API with the actual, the previous, the consensus and an impact grade, updated every 5 to 15 minutes, with more than 12 years of history, over REST and as bulk CSV. Plans start at $9 for 500 API requests, with $19 and $49 tiers and higher PRO plans; it does not offer a free plan. It suits builders who want long calendar history.

7. Finnhub

Finnhub's economic calendar returns the actual, the estimate, the previous and an impact grade for recent and upcoming releases. It sits on the Economic-1 plan at $50 a month, billed quarterly, for personal use, with 10 years of calendar data. It suits builders who already use Finnhub for stock data. Helious and Finnhub side by side.

8. FXMacroData

FXMacroData is a macro data API across 26 currencies, with calendar and announcement endpoints, consensus forecasts, and delivery by stream, WebSocket and webhook. Individual is $50 a month or $500 a year, Business $250 a month; US endpoints answer without a key at up to 100 requests a day with a 15-minute delay. It suits builders who trade many currencies. Helious and FXMacroData side by side.

9. How to choose an economic calendar API

• Decide whether you need the number or the reading. Any API on this list gives you the actual. Only Helious returns how big the surprise was against the release's own history, ready to filter on.
• Check how a print reaches you. A 5-minute refresh is fine for a dashboard and too slow for a trade. On Pro, Helious pushes each release over a WebSocket the moment it lands.
• Price the plan that carries the calendar. Several vendors put the calendar on a separate or higher plan. Helious includes it on every plan, from the free first call up.
• Count what else you need. If your system also reads Treasury auctions, the curve or Fed odds, Helious serves them from the same key.

10. Questions people ask

Is there a free economic calendar API? Yes. Helious answers its first calendar call with no account and gives a free account 100 credits a month, an hour behind. OHLC.dev has a free Basic tier, and FXMacroData answers US endpoints without a key on a delay.

Which economic calendar API scores the surprise? Helious returns a sigma for every printed release, measured against that release's own history, and a word for it from MAJOR MISS to MAJOR BEAT. OHLC.dev returns a deviation ratio against consensus.

Which calendar API pushes releases in real time? Helious pushes each release over one WebSocket, live on Pro and Ultimate. FXStreet lists webhooks and FXMacroData lists streams and webhooks.

What does an economic calendar API cost? As listed in November 2026: Helious is free to start and $39.99 a month on Pro; Finnhub's Economic-1 plan is $50 a month billed quarterly; FXMacroData Individual is $50 a month; Fin2Dev starts at $9 for 500 requests; OHLC.dev runs from a free tier to $100 a month; Trading Economics Standard is $199 a month billed monthly, less billed quarterly or yearly, with the API calendar on its Enterprise plan, priced on request.