Korean stock API from NH Investment & Securities, how the keys, tokens and inactivity rule of Namuh PLUG work
2026-10-22
The short version
- The way to connect your own trading program to an NH Investment & Securities account is Namuh PLUG, a REST API launched on August 10, 2026
- There is one app key per customer number, and the access token has to be renewed every 24 hours
- After a 3-month unit with no trades, the service is cancelled on the first business day of the next month
Search for a Korean stock API with NH Investment & Securities, the broker behind the Namuh app, and two kinds of videos come up. Older ones set conditions inside the app. Newer ones call the broker's API from code or with an AI assistant.
The second route is called Namuh PLUG.
This post shows no code at all. It covers only the structure and rules to know before using PLUG, in the words NH Investment & Securities published itself.
1.How a trading program connects to a broker
API: a channel a broker opens so that other programs can request prices, check balances and place orders.
A trading program decides on its own, builds an order and sends it through the broker's API. The decision happens on your PC or server, the fill happens at the broker.
There are in-app tools too. In August 2023 NH launched price-trigger orders for overseas stocks, watching US, Chinese, Hong Kong and Japanese shares for up to 30 days (Money Today, 2023-08-01). We could not find an official page on how long in-app automatic orders for Korean stocks stay valid, so this post leaves them out.
2.What Namuh PLUG opens up
On August 10, 2026, NH Investment & Securities launched Namuh PLUG and N2 PLUG, open APIs in the REST style (Digital Daily).
REST API: requests go to web addresses and answers come back, with nothing tied to one operating system to install.
Products and platforms
The Namuh PLUG about page lists six products: Korean stocks, overseas stocks, Korean derivatives, overseas derivatives, bonds and spot gold. It says the API works on Windows, Mac or Linux.
The same page sets the commission at 0.01% for Korean stocks and 0.09% for overseas stocks, with other products at the regular Namuh online rate.
One key, a token that lasts a day
Signing up takes four steps.
Open an NH account, agree to the terms on the API application page, receive the security keys, then request an access token and start calling (service guide).
App key: the key that tells the broker which program is calling. It is used together with an app secret.
One app key is issued per customer number, and that one key covers every account. Coverage of the launch said PLUG merged what used to be a separate key per account, and that minor, agent and discretionary accounts can be linked as well.
An access token is valid for 24 hours after it is issued. After that, a new one is requested with the app key and secret. A program left running for more than a day needs token renewal in its code, or it stops.
The mock trading address is separate
The official GitHub SDK linked from the portal lists a live host (api.nhplug.com) and a mock trading host (moapi.nhplug.com) (nhplug-sdk). Account types 01 and 02 are live, 03 is mock.
The order samples in that SDK run as a dry run by default, so a real order goes out only after a setting is changed. It also notes that REST calls measured at about 5 a second, so the SDK throttles to 4 by default.
That figure is a measured value from the SDK notes. We could not find an official limit table on the portal's public pages.
Does the AI place the orders?
The FAQ on NH's Namuh blog says the AI does not place orders by itself. Orders are entered by the trading program the user built (Namuh blog).
3.The cancellation rule that is easy to miss
The about page states it briefly.
If there are no trades in a 3-month unit, the service is cancelled automatically on the first business day of the next month.
The same spot warns that logging in only to the mock trading server can also get the service cancelled. Testing for a long time without trading can cut the live connection. The page adds that the service can be used again by applying once more.
4.How it differs from the old QV Open API
NH's older Open API page offered a C++ 32-bit Windows DLL and was open only to customers who had registered an HTS ID (NH Open API page). It covered stocks, futures, options and ELW.
Mock trading inside that Open API ended on May 31, 2023. For a while, testing meant a live account, and PLUG has brought a mock trading host back.
Compared with our post on the Kiwoom API, Kiwoom splits into a watch feature and two APIs, while NH has gathered the coding route into PLUG alone.
5.The one-line answer
The Korean stock API at NH today is Namuh PLUG, and three rules belong in the code first: one key, a 24-hour token and cancellation after 3 months without trades.
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