Market Indicators in ChatGPT
Calculate market indicators. The MCP server is https://indicators.openkrill.app/mcp. No key. The steps below are only for ChatGPT. A call to compute_indicators was checked against that server on 2026-10-01.
What this server answers
Calculate technical indicators over a price series: SMA, EMA, RSI, MACD, Bollinger Bands, ATR, stochastic oscillator and VWAP. Each answer gives the latest value and a short series of recent values, with the source and the date of the last price.
Ask "calculate the RSI and MACD for euro-dollar", "show the 50-day SMA and Bollinger Bands for dollar-yen" or paste your own candles and ask for ATR, stochastic or VWAP. Your own prices can be anything: stocks, crypto, commodities or a spreadsheet column.
For currency pairs it reads the daily euro foreign exchange reference rates of the European Central Bank (30 currencies, history of about 12 months daily or three years weekly) and calculates close-based indicators from them. The ECB publishes one rate per day, so ATR, stochastic and VWAP, which need high, low and volume, are calculated only from candles you supply.
The maths is done by trading-signals 8.3.0 (MIT licence, Benny Neugebauer). The indicators are calculated by this plugin; they are not published or endorsed by the European Central Bank. Rates are cached for up to an hour and are not real time.
It is informational only and not financial advice. It reports numbers: it gives no buy or sell signals, no price predictions and no recommendations, and it has no trading, broker, wallet or backtesting features.
It stores nothing about you or your prices: the only lasting record is a daily count of calls per tool.
What it can do
- Calculates SMA, EMA, RSI, MACD, Bollinger Bands, ATR, stochastic oscillator and VWAP
- Works on candles you paste, up to 250, with no outside lookup
- Reads ECB daily euro reference rates for 30 currencies, daily or weekly, and calculates close-based indicators
- Returns the latest value and a short series of recent values, with the settings used
- Names the source, the library and the date of the last price in every answer
- Reports numbers only: no signals, no recommendations, no trading features
Tools
compute_indicators, Compute indicators. Calculates indicators from prices the user gives. Use it when the user gives their own prices and wants indicators calculated, such as "calculate ATR and stochastic from these candles". Pass prices (2 to 250 candles, oldest first, each with a numeric close and optionally time, open, high, low and volume) and indicators from sma, ema, rsi, macd, bollinger, atr, stochastic and vwap; optionally periods and series_length. atr and stochastic need high and low on every candle, and vwap needs high, low and volume. Returns the latest value and a short series for each indicator, with the settings used. Makes no outside request and keeps nothing. Informational only, not financial advice; gives no signals.get_indicators, Get indicators. Calculates indicators for a currency pair. Use it when the user names a currency pair and wants indicators, such as "RSI and MACD for euro-dollar" or "50-day SMA for dollar-yen on the weekly chart". Pass symbol as two ISO currency codes (for example euro-dollar), interval 1d (default) or 1w, and indicators from sma, ema, rsi, macd and bollinger; optionally periods and series_length. Reads the European Central Bank's daily euro reference rates, so it covers its 30 currencies and only close-based indicators; stocks, crypto, atr, stochastic and vwap need compute_indicators with the user's own candles. Returns the latest value and a short series for each indicator, with the source and the date of the last rate. Informational only, not financial advice; gives no signals.
Add Market Indicators in ChatGPT
ChatGPT does not read a local config file. A custom MCP server is added in the product, and only after developer mode is on. These steps were checked against OpenAI's plugin connect guide and the ChatGPT MCP guide on 2026-10-01. Developer mode can be hidden by a workspace policy, so a Team or Enterprise admin may have to allow it first.
- Open ChatGPT settings, then Security and login, and turn on Developer mode.
- Open ChatGPT plugins and select the plus button.
- Enter a name such as "Market Indicators" and a one-line description of what you want it to answer.
- Under Connection, choose the public endpoint and paste
https://indicators.openkrill.app/mcp. Include the/mcppath. Do not add a tunnel id: this server is already public. - Create the connection and review the tools ChatGPT lists. You should see
compute_indicators,get_indicators. The feedback tools on the same server are optional and not required for the lookup. - Start a new conversation, add the connection from the tools menu, and ask: Calculate ATR and stochastic from these OHLC candles
No API key and no OAuth client id are required. The server answers without a login. Calls are limited per network and per day, and a limit comes back as a tool error rather than a partial answer. If the tool list is stale after a server change, open the connection and select Refresh, then start a new conversation.
The ChatGPT desktop app, Codex CLI and IDE extension share a different config. In the desktop app, open Settings, then MCP servers, choose Add server, select Streamable HTTP, and paste the same URL. In ~/.codex/config.toml the equivalent is a table named mcp_servers.market-indicators with url = "https://indicators.openkrill.app/mcp". ChatGPT on the web does not read that file. A published directory listing is also a different path: this page is the developer-mode connection, not a claim that Market Indicators is already in the ChatGPT directory.
Treat the server as untrusted until you have read a few answers. A remote MCP server sees the arguments the model sends. Market Indicators is read-only and documents what it sends onward on the privacy page.
A call checked on 2026-10-01
Five closes and a 3-period simple moving average stay inside the worker and make no outside request. The result is a number, not a buy or sell signal, and not financial advice. The request below was posted to https://indicators.openkrill.app/mcp as tools/call. HTTP 200. Source: the Market Indicators server, read 2026-10-01.
{
"method": "tools/call",
"params": {
"name": "compute_indicators",
"arguments": {
"prices": [
{
"close": 10
},
{
"close": 11
},
{
"close": 12
},
{
"close": 13
},
{
"close": 14
}
],
"indicators": [
"sma"
],
"periods": {
"sma": 3
}
}
}
}- status. ok
- as of. 2026-10-01
- source. Prices supplied in the request
- latest. 13
- notice. Informational only, not financial advice. These are calculated values, not buy or sell signals.
Repeat the call yourself if you need a newer reading. Cached answers expire. A rate limit is not a result: wait and try again. Nothing in the call is a ranking, a filing, or advice.