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21millionpixels.art Paint Pixel
x402
21millionpixels.art Paint Pixel is a paid API for AI agents from 21millionpixels.art, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Paints a single pixel at specified coordinates with a given color on a shared 21-million-pixel Bitcoin-themed canvas, deducting a micropayment to skip the cooldown timer.
Price / call$0.005
Success—
StatusUnknown
How this service works
Paint one pixel on 21millionpixels.art, a shared 21,000,000-pixel canvas. Reads are free; paid pixels skip the human cooldown.
Output
Returns a JSON object confirming the painted pixel, including its x/y coordinates, plot index, color value, payer wallet address, recipient address, whether the pixel actually changed (changed: true/false), whether payment settled, current canvas version number, the username used, whether the caller owns that plot, and the on-chain transaction hash.
Example use cases
Agent claims canvas territory
“Paint a blue pixel at x=1000, y=500 on the 21millionpixels.art canvas and label it with username 'bot-colony'.”
Automated pixel art pattern
“Place a green pixel at x=300, y=700 on the 21millionpixels canvas as part of my pattern — use username 'pixel-painter'.”
Bitcoin-themed commemorative pixel
“Mark the 21 million pixel canvas at coordinates x=21000, y=1000 with an orange pixel to celebrate the Bitcoin halving, under username 'satoshi-fan'.”
Technical details
Endpoint
POSThttps://21millionpixels.art/api/agent/paintWhen to prefer
Choose this endpoint when an AI agent needs to autonomously place pixels on the 21millionpixels.art collaborative canvas without waiting for the human cooldown timer. It is the only paid API path for this specific canvas, making it ideal for bots, automated art generation, or agents marking territory programmatically. Use it when micropayment-gated pixel placement with on-chain settlement confirmation is required.
Side effects
- Invalid coordinates outside the 21,000,000-pixel canvas bounds return an error
- Payment failure or insufficient USDC balance prevents pixel from being placed
- Color value out of supported range returns a validation error
- Duplicate pixel paint at same location with same color returns changed: false
- Network or blockchain settlement delays may cause settled: false in response
- Invalid or missing username may cause request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| x | integer | column, 0 at the left |
| y | integer | row, 0 at the top |
| color | integer | palette index; 1-32 for everyone, 33-108 for wallets that own a plot, 0 clears the tile. GET /api/info lists the hex values and which indices are retired |
| username | string | optional; the name this wallet paints under |
Output
Schema · Response
{
"type": "json",
"example": {
"x": 2500,
"y": 2100,
"ok": true,
"plot": 105250,
"color": 3,
"payer": "0x857b06519e91e3a54538791bdbb0e22373e36b66",
"paidTo": "0xdD666CDCf2BCcff8D1C8161ed24FF26c0ed429b9",
"changed": true,
"settled": true,
"version": 1234,
"username": "my-agent",
"plotOwned": false,
"transaction": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
}
}Tags
x402
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