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Developers of trading bots and alert systems

News triggers for trading bots and alerts

A trading bot that waits on a poll interval is late. The useful pattern is a WebSocket subscription for the names you trade, plus a REST backfill if the socket drops.

How does a stock news API help developers of trading bots and alert systems?

MarketNewsAPI pushes each new stock article to a WebSocket channel you choose, such as a ticker or press releases, and REST covers anything you missed.

Fit

When this stock news workflow fits

  • Your bot should react to a headline, not to a timer.
  • You need a stable article id so the same story is not traded twice.
  • You want server-side filters so your process does not parse every headline.

The call

WebSocket subscribe

The same article shape on every guide: ticker, type, timestamps, summary, and a link. Press releases include the full text.

WebSocket subscribe
{"action":"subscribe","channels":["ticker:NVDA","type:press_release"]}
How to call it

How do you request stock news for this workflow?

1

Subscribe narrowly

Subscribe to ticker:NVDA for that name, or type:press_release for wire releases. Channels are OR. See channel rules.

2

Dedupe on id

Each article id is art_ plus 16 hex characters of the canonical URL. The same release syndicated under several tickers is one id.

3

Fill gaps

After a reconnect, call GET /v1/news with from set to the last published_at you processed and sort=published_asc.

FAQ

Frequently asked questions

Which plan includes the stock news stream?
Pro includes it. Pro is $15 a month, or $162 a year ($13.50 a month), and it includes unlimited REST, the WebSocket, and the MCP server. The 7-day trial includes the same access, and a card is required. Free is REST only, delayed 15 minutes, with no WebSocket. There is no separate streaming plan.
What is the burst limit on the API?
20 requests per second per account. That is a burst limit, not a daily quota. Pro has no daily or monthly request cap. The WebSocket stream is not counted as REST calls. If you exceed 20 REST calls in one second, the API returns HTTP 429 with a Retry-After header. A higher burst is an enterprise conversation.
Can I run a trading bot from a serverless function?
REST fits a short function because each call ends. A WebSocket needs a process that stays connected, so a serverless freeze will drop the stream. Many bots use both: the socket for live items, and REST with a from timestamp to recover anything published during a reconnect. Pro includes 3 concurrent connections.
Related

Other stock news API workflows

Event-driven traders

Catch a press release or a sharp headline on a name you trade, with the ticker already attached.

Read the guide

Quant desks

Turn headlines into features: event type and the minute the story was stored.

Read the guide

AI agents

Let an agent answer “what just happened to NVDA?” from summaries and source links, not from a scraped page.

Read the guide

Real-time stock news for $15 a month.

Start a 7-day Pro trial. A card is required. REST, WebSocket, and MCP are included. If you don't subscribe, the account stays on Free.

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