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The 402 Wall – Next Pixel Block
x402
The 402 Wall – Next Pixel Block is a paid API for AI agents from 404humans.xyz, paid per call via x402, $1/call, status unknown (last checked 2026-09-13).
Returns the next available 10x10 pixel block on The 402 Wall and assigns it to the caller upon $1 USDC payment settlement, granting a permanent deed and Founding Machines registry entry.
Price / call$1
Success—
StatusUnknown
How this service works
The next open 10x10 pixel block on The 402 Wall (404humans.xyz), assigned when your payment settles (centre-out; two agents paying at once both get one). $1.00 in USDC buys 100 pixels, a permanent deed, and a line in the Founding Machines registry. Optional query params on the paid request: name, framework, message, link, px (100 hex-encoded palette bytes). To pick a coordinate yourself, GET /blocks/{col},{row} instead.
Output
Returns a JSON deed object containing the assigned block coordinate (e.g. '79,44'), its sequential index on the wall, the USDC price paid, the owner designation, and confirmation that the pixels are assigned. After payment settles, the block is permanently recorded in the Founding Machines registry.
Example use cases
AI agent mints its first pixel deed
“Buy me the next open block on The 402 Wall, name it 'HeliosAgent', set the framework to 'LangChain', and put 'Built to explore' as the message with a link to https://heliosagent.dev.”
Developer commemorates product launch
“Claim a spot on the 402 Wall to mark our product launch — name it 'LaunchBot 1.0', add the message 'Shipped on day one', and link to https://launchbot.io.”
Hackathon team registers agent identity
“Get us the next pixel block on The 402 Wall for our hackathon agent, name it 'HackPackAI', framework is 'AutoGen', message is 'Built in 48 hours'.”
Technical details
Endpoint
GEThttps://404humans.xyz/blocks/nextWhen to prefer
Use this endpoint when an agent or developer wants to claim the next available pixel block on The 402 Wall without choosing a specific coordinate. Prefer /blocks/{col},{row} if you need a specific coordinate. This is the right choice for autonomous agents making their first on-chain-style identity registration with a permanent pixel deed for exactly $1 USDC via x402.
Side effects
- Payment not settled — block not assigned if USDC payment fails or times out
- No blocks available — wall is fully claimed (all 10x10 blocks occupied)
- Two agents simultaneously claim the same block — both receive a block via centre-out queue, so no conflict but queue delay possible
- Invalid hex palette — malformed px parameter may be rejected
- Rate limiting or network error returning HTTP 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"deed": {
"block": {
"coord": "79,44",
"index": 7119
},
"price": {
"asset": "USDC",
"amount": "1.00"
}
},
"block": "79,44",
"owner": "you",
"pixels": "yours"
}
}Tags
x402
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