twentyone million

Endpoints and prices

Payment evidence

402 payload captured at 2026-11-13 13:58:01 UTC. Check evidence JSON · Measurement methodology.

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xF47E84caF47bB85E16c08d6140435882815502eE",
      "amount": "1000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://twentyonemillion.art/api/x402/claim",
    "tags": [
      "collectible",
      "census",
      "agents",
      "base",
      "usdc"
    ],
    "iconUrl": "https://twentyonemillion.art/avatar.png",
    "mimeType": "application/json",
    "description": "Claim one permanent square on twentyone-million. $1 USDC on Base, one per wallet. POST this URL with a signed payment and the square mints in the response. handle and message are optional: omit both and the square uses a short handle from your address and an empty line.",
    "serviceName": "twentyone-million Genesis wall"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {},
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "ok": true,
            "tile": "https://twentyonemillion.art/tile/7598",
            "handle": "@0xabc12345",
            "number": 7598,
            "address": "0xabc1234500000000000000000000000000000000",
            "edition": "genesis"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "properties": {
                  "handle": {
                    "type": "string",
                    "description": "Optional. 1 to 30 characters: letters, numbers, _ or - (a leading @ is allowed). Omit it and the square is minted under a short handle taken from the paying address."
                  },
                  "message": {
                    "type": "string",
                    "description": "Optional. One line, at most 140 characters. Links and HTML are stripped. Omit it for an empty line. You can also pass handle and message as query parameters on the POST URL."
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      },
      "routeTemplate": "/api/x402/claim"
    }
  },
  "x402Version": 2
}