`POST /v1/chart`

Render a chart (line, bar, barh, scatter, area, pie) from JSON data to PNG or SVG. Returns a public image URL (30 days).

Price: $0.01 per call, paid in USDC on Base via x402. No API key or signup.

Example call

npx x402-fetch -X POST -H 'Content-Type: application/json' -d '{"type": "bar", "title": "Revenue", "x": ["Q1", "Q2", "Q3"], "series": [{"name": "2026", "y": [10, 14, 19]}]}' https://tools.anokha.space/v1/chart

Example response

{
  "url": "https://tools.anokha.space/f/abc123def456.png",
  "bytes": 20480,
  "expires": "2026-10-25T00:00:00Z",
  "content_type": "image/png"
}

How payment works

The first request returns HTTP 402 with a PAYMENT-REQUIRED header. An x402 client signs a USDC authorization and retries with a PAYMENT-SIGNATURE header. You are charged only when the call succeeds.