Finance chart

Live

Visualize supplied OHLCV candles.

FreeFree with an OpenNan key. 30 finance requests per minute per account.

ToolPOST /v1/finance/chartsFree · 30 requests/min

Request

Return a line or candlestick chart specification from candles supplied by the caller.

Candles (JSON)Chart typeTitle

Finance chart

Example output

Caller-supplied data

Example price series

RisingFalling

Inspect record

Open 100 · High 103 · Low 98 · Close 101

Data table

Open	High	Low	Close	Volume
100	103	98	101	1,050
103	106	101	104	1,100
102	105	100	103	1,150
108	111	106	109	1,200
105	108	103	106	1,250
110	113	108	111	1,300
109	112	107	110	1,350

Response

{
  "data": {
    "candles": [
      {
        "time": "2026-01-01T00:00:00Z",
        "open": 100,
        "high": 103,
        "low": 98,
        "close": 101,
        "volume": 1050
      },
      {
        "time": "2026-01-02T00:00:00Z",
        "open": 103,
        "high": 106,
        "low": 101,
        "close": 104,
        "volume": 1100
      },
      {
        "time": "2026-01-03T00:00:00Z",
        "open": 102,
        "high": 105,
        "low": 100,
        "close": 103,
        "volume": 1150
      },
      {
        "time": "2026-01-04T00:00:00Z",
        "open": 108,
        "high": 111,
        "low": 106,
        "close": 109,
        "volume": 1200
      },
      {
        "time": "2026-01-05T00:00:00Z",
        "open": 105,
        "high": 108,
        "low": 103,
        "close": 106,
        "volume": 1250
      },
      {
        "time": "2026-01-06T00:00:00Z",
        "open": 110,
        "high": 113,
        "low": 108,
        "close": 111,
        "volume": 1300
      },
      {
        "time": "2026-01-07T00:00:00Z",
        "open": 109,
        "high": 112,
        "low": 107,
        "close": 110,
        "volume": 1350
      }
    ],
    "type": "candlestick",
    "title": "Example price series"
  },
  "meta": {
    "sources": [
      "Caller-supplied data"
    ],
    "retrieved_at": "2026-11-11T01:39:41.977674+00:00",
    "example_output": true
  }
}

Highlighted lines match the selected record.

Tool discovery · GET /v1/tools · MCP tools/list

How it works

01Choose your inputsEnter a symbol, series or ordered OHLCV candles.
02Inspect the resultSelect a chart record to highlight its exact JSON values.

Call Finance chart from your code

REST and MCP share inputs, results and validation errors.

POSThttps://api.opennan.com/v1/finance/charts

Get an API key
Create a key in the console. It uses the same balance as the playground.
Create a key

Send your first request

The same request the playground sends. Set OPENNAN_KEY to your key.

curl 'https://api.opennan.com/v1/finance/charts' \
  -H 'Authorization: Bearer <OPENNAN_API_KEY>' \
  -H 'Content-Type: application/json' \
  --data '{"type":"candlestick","title":"Example price series","candles":[{"time":"2026-01-01T00:00:00Z","open":100,"high":103,"low":98,"close":101,"volume":1050},{"time":"2026-01-02T00:00:00Z","open":103,"high":106,"low":101,"close":104,"volume":1100},{"time":"2026-01-03T00:00:00Z","open":102,"high":105,"low":100,"close":103,"volume":1150},{"time":"2026-01-04T00:00:00Z","open":108,"high":111,"low":106,"close":109,"volume":1200},{"time":"2026-01-05T00:00:00Z","open":105,"high":108,"low":103,"close":106,"volume":1250},{"time":"2026-01-06T00:00:00Z","open":110,"high":113,"low":108,"close":111,"volume":1300},{"time":"2026-01-07T00:00:00Z","open":109,"high":112,"low":107,"close":110,"volume":1350}]}'

Read the result
The result comes back in the same response. The X-Usage-Cost-Usd header says what the call cost.

Errors and how to fix them

401Missing or wrong key
Send the header Authorization: Bearer with a key from the console.
402Balance too low
Add credit in Billing, then send the same call again.
400A value is not accepted
Read error.message: it names the field. Use a value from the parameter table.
429Too many requests
Wait a few seconds and try again, waiting longer after each 429.

MCPhttps://api.opennan.com/v1/finance/mcp

This tool from your AI

Once Opennan is added, your AI calls this tool with arguments like these.

Tool: finance_chart
Example arguments: { "type": "candlestick", "title": "Example price series", "candles": [ { "time": "2026-01-01T00:00:00Z", "open": 100, "high": 103, "low": 98, "close": 101, "volume": 1050 }, { "time": "2026-01-02T00:00:00Z", "open": 103, "high": 106, "low": 101, "close": 104, "volume": 1100 }, { "time": "2026-01-03T00:00:00Z", "open": 102, "high": 105, "low": 100, "close": 103, "volume": 1150 }, { "time": "2026-01-04T00:00:00Z", "open": 108, "high": 111, "low": 106, "close": 109, "volume": 1200 }, { "time": "2026-01-05T00:00:00Z", "open": 105, "high": 108, "low": 103, "close": 106, "volume": 1250 }, { "time": "2026-01-06T00:00:00Z", "open": 110, "high": 113, "low": 108, "close": 111, "volume": 1300 }, { "time": "2026-01-07T00:00:00Z", "open": 109, "high": 112, "low": 107, "close": 110, "volume": 1350 } ] }

Finance chart: questions

Is it free?

Free with an OpenNan key. 30 finance requests per minute per account.

Where does the example come from?

Example output was recorded from the shipped endpoints. Run live to request current data. Crypto previews are labeled Sample data.

What are the limits?

Stock tools cover SEC issuers and USD US-GAAP facts. Missing values are null. Macro covers the recent three calendar years and reports coverage. Charts accept 2–5,000 candles. SMA needs period candles, RSI and return need period plus one. Period is 2–500. Dates use inclusive from and exclusive to.

Finance chart

Request

Finance chart

Example price series

How it works

Call Finance chart from your code

Get an API key

Send your first request

Read the result

Errors and how to fix them

This tool from your AI

Finance chart: questions