A screenshot gives an AI pixels to interpret. Connected to Basis, ChatGPT or Claude reads the candles and computes the indicators itself, draws the levels it means on a real chart, looks at that chart to check its work, and gives you the link.
A screenshot loses everything the model needs to be precise. It has to read prices off an axis, guess indicator values from the height of a line, and infer the timeframe and venue from the corner of the image.
It will still answer — fluently. The level it names may be off by a percent, the RSI it reads may be from the wrong pane, and there is no way to check without doing the analysis yourself.
One server URL for every assistant. There is nothing to sign up for and no key to paste.
https://www.basischarts.com/api/mcpPlugins → the plus button → Add custom MCP server. Paste the URL, accept the notice and press Create as a plugin. Then switch Basis on in a new chat.
ChatGPT asks you to confirm before a tool that changes something runs, and building a chart counts as one. Available on plans that allow custom MCP servers.
Customize → Connectors → + Add → Add custom connector. Name it Basis, paste the URL, then Continue and Add.
Works on every Claude plan, including Free (one custom connector). There is nothing to authorise: the connector has no login step because Basis does not ask for one.
Run this once in any project. It is saved for every session afterwards.
claude mcp add --transport http basis https://www.basischarts.com/api/mcpAdd to ~/.cursor/mcp.json, or .cursor/mcp.json inside one project.
{
"mcpServers": {
"basis": {
"type": "http",
"url": "https://www.basischarts.com/api/mcp"
}
}
}Every client, tool and limit is on the Basis MCP page.
The candles themselves, and 200 indicators computed on the same engine the chart draws with — values, thresholds and crossings, not readings off a picture.
Swing highs and lows, Fibonacci, trendlines and position boxes placed at the prices and times it measured.
The assistant can ask for a picture of the chart it built, drawn the way Basis draws it, and check that what it describes is what you will see.
The link opens the exact chart in Basis — venue, timeframe, indicators, drawings — with no account.
Each one asks the assistant to check something specific, and says what it will look at — so you can tell a measured answer from a fluent one.
Analyse ETHUSDT on the 1h: trend, momentum and the two most important levels. Draw them and send me the chart.
Checks: Live candles, computed indicators, drawn levels and a chart link.
Draw a Fibonacci retracement from the last major swing low to the swing high on BTC 4h and tell me where price sits in it.
Checks: Swing points from the candles and a Fibonacci at those coordinates.
I think SOL is breaking out on the 4h. Check the volume and RSI and tell me what would prove me wrong.
Checks: Candles, volume and RSI on the move, with an invalidation level.
Draw a long position box on BTC 1h with entry at the current price, the stop under the last swing low and a 2R target.
Checks: The live price, the swing low and a position drawing.
Basis also has an assistant built into the terminal that works the chart in front of you, with your own model key. The free AI chart analysis page explains it; this page is about the assistant you already use.
The assistant built into BasisIt can describe one from a screenshot, imprecisely. Connected to Basis it analyses the data behind the chart and draws its conclusions on a real one.
For anything involving a number, yes: prices, indicator values and levels come from the data, and the chart it hands back can be checked.
Any of the 200 in Basis, from RSI and MACD to VWAP, Supertrend, Ichimoku and Williams fractals, computed rather than read off an image.
No. It builds a chart in its own session and hands you a link; opening the link puts that chart in your Basis workspace.
No account and no API key, on Basis's side.
Paste the URL into your assistant, then ask it what the market is doing — and to show you what it checked.
https://www.basischarts.com/api/mcpSetup steps are as OpenAI and Anthropic document them in October 2026; menus change. Basis reports what venues publish and what the maths says about it. Nothing here is financial advice.