How to draw interactive candlestick stock charts with SMA and RSI in an AI agent

On 2026-10-20, calling chart on Trade Chart for Microsoft Corporation (MSFT) over the 1d timeframe returned 220 daily OHLCV bars from 2025-12-03 to 2026-10-19 (last close 533.52 US dollars, up 0.84 percent, volume 17.98 million shares) with a 50-day Simple Moving Average of 506.203, a 14-day Relative Strength Index of 59.551 (59.55098), a 39 KB interactive Vela 0.8.0 candlestick HTML chart and a shareable chart link in 972 ms.

When an AI agent is asked to show a stock chart with technical indicators, general web chat models either refuse because they cannot render live charts or link to a static image with fixed overlays. The Trade Chart MCP server (https://chart.openkrill.app/mcp) fetches public market data from Yahoo Finance with no API key, computes up to 8 technical indicators on the series, and returns both structured indicator readings and an interactive HTML chart rendered with Vela 0.8.0 (Apache-2.0, LuxAlgo).

1. Draw a daily MSFT candlestick chart with SMA(50) and RSI(14)

The chart tool on https://chart.openkrill.app/mcp accepts:

• symbol: ticker symbol such as "MSFT", "AAPL" or "NVDA".
• timeframe: "5m", "15m", "1h", "1d" (default) or "1w".
• indicators: any combination of "sma", "ema", "rsi", "macd", "bollinger", "atr", "stochastic" and "vwap".
• periods: optional custom period lengths (2 to 100) for single-length studies, such as {"sma": 50}.
• theme: "dark" (default) or "light".

Here is the exact JSON-RPC call from our saved 2026-10-20 run for Microsoft Corporation (MSFT):

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "chart",
    "arguments": {
      "symbol": "MSFT",
      "timeframe": "1d",
      "indicators": ["sma", "rsi"],
      "periods": {
        "sma": 50
      }
    }
  }
}

And here is the structured summary returned in 972 ms (972 ms on the supplementary verification run after commit 1c3246ee9, 1,090 ms on the initial ranking run):

{
  "as_of": "2026-10-19T13:30:00.000Z",
  "status": "ok",
  "symbol": "MSFT",
  "name": "Microsoft Corporation",
  "timeframe": "1d",
  "bars": 220,
  "lastClose": 533.52001953125,
  "changePercent": 0.8449,
  "indicators": [
    {
      "indicator": "sma",
      "params": { "length": 50 },
      "latest": { "value": 506.203 },
      "read": "The 50-period simple moving average is 506.203. The last close is above it."
    },
    {
      "indicator": "rsi",
      "params": { "length": 14 },
      "latest": { "value": 59.55098 },
      "read": "The 14-period RSI is 59.551."
    }
  ],
  "openUrl": "https://chart.openkrill.app/chart?symbol=MSFT&timeframe=1d&theme=dark&indicators=sma%2Crsi&sma=50",
  "chartLibrary": "Vela 0.8.0 (Apache-2.0, LuxAlgo, https://velacharts.dev). PineTS is not used.",
  "source": "Yahoo Finance public chart data (https://finance.yahoo.com), no key"
}

2. What the MSFT 1-day readings show

Across the 220 daily bars from 2025-12-03 through 2026-10-19:

• Last close and volume: MSFT closed at 533.52 US dollars (533.52001953125), up 0.84% (changePercent: 0.8449) from the prior session, with last-bar volume of 17,984,300 shares (17.98 million).
• 50-day Simple Moving Average: 506.203. With the close at 533.52, Microsoft trades 27.32 points (+5.40 percent) above its 50-day trend line.
• 14-day Relative Strength Index: 59.551 (59.55098), sitting in neutral-to-bullish territory below the standard 70 overbought threshold and above the 30 oversold threshold.
• Interactive HTML and direct URL: structuredContent.html embeds a self-contained 39 KB HTML page that boots Vela 0.8.0 with all 220 OHLCV bars, volume bars, the 50-period SMA overlay and the 14-period RSI sub-pane, plus a timeframe switcher (5m, 15m, 1h, 1d, 1w) and a light/dark theme toggle. The openUrl field gives a direct link that preserves the custom &sma=50 period in the query string.

3. How Trade Chart compares with StockCharts, TradingView and Finviz

On 2026-10-20 we benchmarked the same daily MSFT candlestick chart with 50-day SMA and 14-day RSI across Trade Chart and three charting sites:

4. Connect Trade Chart in Claude Desktop, Cursor or any MCP client

Point your MCP client at the keyless Streamable HTTP endpoint:

{
  "mcpServers": {
    "trade-chart": {
      "type": "streamable-http",
      "url": "https://chart.openkrill.app/mcp"
    }
  }
}

The server allows 60 calls per minute per network and 5,000 calls per day per server with no account. All output is informational only and does not recommend trades or place orders.

Frequently asked questions

How can I generate a daily candlestick chart of Microsoft stock with the 50-day moving average and RSI in an AI agent?

Call chart on https://chart.openkrill.app/mcp with symbol set to "MSFT", timeframe set to "1d", indicators set to ["sma", "rsi"] and periods set to {"sma": 50}. The server returns 220 daily bars from Yahoo Finance, computed SMA(50) and RSI(14) values, a 39 KB interactive Vela 0.8.0 HTML chart and a shareable chart.openkrill.app URL.

What is the current 50-day SMA, 14-day RSI, and daily close for MSFT?

Across 220 daily Yahoo Finance bars from 2025-12-03 to 2026-10-19 checked on 2026-10-20 via Trade Chart, Microsoft Corporation (MSFT) closed at 533.52 US dollars (+0.84 percent) on volume of 17.98 million shares, with a 50-day Simple Moving Average of 506.203 and a 14-day RSI of 59.551 (59.55098).

Where can I get a free stock chart with custom indicators without signing up?

OpenKrill's Trade Chart MCP server (https://chart.openkrill.app/mcp) requires no account or API key and returns both an inline HTML chart and a direct browser link such as https://chart.openkrill.app/chart?symbol=MSFT&timeframe=1d&theme=dark&indicators=sma%2Crsi&sma=50 rendered with Vela 0.8.0.

What timeframes and technical indicators does Trade Chart support?

Trade Chart supports 5-minute ("5m"), 15-minute ("15m"), 1-hour ("1h"), daily ("1d") and weekly ("1w") timeframes, and computes up to 8 indicators: Simple Moving Average ("sma"), Exponential Moving Average ("ema"), Relative Strength Index ("rsi"), MACD ("macd"), Bollinger Bands ("bollinger"), Average True Range ("atr"), Stochastic ("stochastic") and Volume Weighted Average Price ("vwap").

Sources

• Yahoo Finance Public Chart Data (MSFT)
• Vela 0.8.0 Charting Library (Apache-2.0, LuxAlgo)
• OpenKrill Trade Chart MCP Server Documentation