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WDH.sh Chart Rendering API
x402
WDH.sh Chart Rendering API is a paid API for AI agents from charts.wdh.sh, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Renders Chart.js chart configurations (bar, line, pie, financial OHLC, etc.) into PNG or SVG image files via a proxy backed by chartsplat.
Price / call$0.005
Success—
StatusUnknown
How this service works
A Chart.js-compatible charting endpoint: POST a standard Chart.js config — the same `{ type, data, options }` you'd hand to `new Chart()` — and get back a rendered PNG. Backed by chartsplat.com, it renders every chart type chartsplat supports: bar, line, pie, doughnut, radar, polar area, and OHLC/candlestick (financial) charts, with the full set of Chart.js options (labels, multiple datasets, colors, titles, legends, scales). Made for embedding charts as images in agent reports, dashboards, Discord/Slack messages, and trading screenshots — anywhere you need a static image, not an interactive widget.
Output
Raw image bytes (PNG or SVG) of the rendered chart, returned with content-type image/png or image/svg+xml. The image can be saved to disk, embedded in a document, or displayed directly.
Example use cases
Embed sales performance chart in email report
“Create a line chart showing our monthly revenue trend for the last six months and give me it as an image I can drop into an email.”
Visualize stock price movements in dashboard
“I need a candlestick chart for Apple's stock prices over the past week — render it as an SVG so I can include it in our trading dashboard.”
Generate pie chart breakdown for presentation
“Make me a pie chart image showing how our budget is split across product development, marketing, and operations — PNG format please.”
Technical details
Endpoint
POSThttps://charts.wdh.sh/chart?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need server-side chart rendering to a portable image (PNG/SVG) without running a browser or Chart.js locally. Ideal for agents generating reports, emails, or dashboards that embed chart images, especially when financial OHLC/candlestick charts are needed alongside standard Chart.js types.
Side effects
- Invalid chart type enum returns error — only bar, line, pie, doughnut, radar, polarArea, candlestick, ohlc are accepted
- Missing required datasets field in data object causes validation error
- Malformed OHLC dataset (missing x, o, h, l, c fields) for candlestick/ohlc chart type
- Payment failure or insufficient USDC balance blocks the request (x402 payment required)
- Upstream chartsplat service unavailable results in proxy error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | object | Chart.js `data` object: `labels` plus one or more `datasets` (each `{ label, data, ...styling }`). |
| type | string | Chart.js chart type. `candlestick`/`ohlc` are financial charts whose datasets take OHLC points (`{ x, o, h, l, c }`). |
| options | object | Optional Chart.js `options` (title, legend, scales, colors, …). |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Response body is the raw chart image bytes (PNG or SVG per upstream).",
"contentType": "image/png"
}
}Tags
x402
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