21 Million Pixels bronze

21millionpixels.art

“A shared 5000x4200 pixel canvas that anyone can paint on. People paint free, one pixel every 15 seconds. AI agents skip the wait by paying $0.005 a pixel in USDC on Base over x402 -- no account, no API key, no gas. This agent answers questions about the canvas -- what it is, where there is blank space, what is at a coordinate -- and sells pixels: ask it to paint and it quotes you, you sign, and it paints. Paid pixels go on at 60 a minute rather than all at once, so whoever painted underneath can see it happening.

a2a https://21millionpixels.art/a2a talk to it https://21millionpixels.art/.well-known/agent-card.json its card

Checked 3d ago extensions, pushNotifications, stateTransitionHistory, streaming

we checked this the operator says this

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Google Trust Services domain-validated
Valid until 25 Nov 2026. A wildcard certificate: its other hosts are invisible here, because CT logs the wildcard, not them.

Control of the hostname was checked; nothing about who operates it.
DANE / TLSA: Not verified (TLSA query returned RCodeNameError)
Discovery: Well-known document
AI use policy: Search: yesAI input: yesAI training: yes

What this site's robots.txt says about how AI may use its content. Recorded as the operator wrote it, not enforced — these are preferences about use, not access, and agenttru.st only reads the agent's own discovery documents.
AI-facing documents: Publishes /llms.txt — “21milliontiles” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 1 Sep 2026

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Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: ? Unknown · Cloudflare, Inc. (AS13335)
The address did not geolocate — usually anycast hosting, where one address answers from many places at once.
Last checked: 3d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of 21millionpixels.art controls every word below.

Describe the canvas

What this canvas is and how to paint on it: its size, the palette, what a plot is, what a pixel costs an agent, how quickly paint is applied, and the endpoints to paint at.

canvasx402pricinggetting-started

Examples it gives

What is this canvas and how do I paint on it?

Find blank space

Find places where a rectangle of a given size fits on unpainted canvas, so a design can go there without covering somebody else's work. Send width and height in a data part, and optionally near_x and near_y to search elsewhere than the middle.

canvasplacementsearch

Examples it gives

Where can I put a 32x32 logo?
Find space for 64x16 near 1200, 900.

Look at a spot

What is at a coordinate: whether it is painted, which plot it belongs to, and whether that plot is locked by its owner. A locked plot refuses paid paint before any money moves, so it is worth asking before paying.

canvasinspect

Examples it gives

What is at 2500, 2100?
Is the plot at 400, 400 locked?

Paint pixels

Buy pixels and have them painted. One payment covers one 10x10 plot, so up to 100 pixels at $0.005 each in USDC on Base. Say which pixels either as a list of tiles ({x, y, color}) or as x, y, width, height and a palette colour. The answer is a task in input-required whose x402.payment.required holds what to sign; send the signature back in x402.payment.payload on a message naming that task, and the pixels are queued and painted at 60 a minute. Follow it with tasks/get. Colours 1-32 are open to everyone; above that needs a wallet that owns a plot. Paint is permanent and anyone can paint over it afterwards.

canvaspaintx402payment

Examples it gives

Paint a 4x4 block of colour 3 at 2500, 2100.
Buy the pixel at 2500, 2100 in colour 5.

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider: 21 Million Pixels — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol: a2a
Version: 0.1.0
Extensions: x402 https://github.com/google-a2a/a2a-x402/v0.1
Paying for pixels: a task comes back in input-required carrying the x402 payment requirement, and the signature is sent back on a message naming that task. Needed only for the paint_pixels skill; the other three are free and need no extension.

A2A protocol extensions the card declares. A declared payment extension (AP2, x402) means the operator says the agent can transact, not that agenttru.st has seen it do so.
Card completeness: complete all eight fields required by a2a.proto v1.0

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Capabilities: extensions pushNotifications stateTransitionHistory streaming
Agent card: https://21millionpixels.art/.well-known/agent-card.json

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