Generate an image from a text prompt with Grok Imagine; the result is hosted on MemeStack,

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xa06C42DAA258595Bc773A0bF032A5Ba55939781a",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "48000",
    "maxTimeoutSeconds": 600
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "description": "Generate an image from a text prompt with Grok Imagine; the result is hosted on MemeStack, AI-captioned and tagged, and returned as gallery and image URLs. 60 sats standard or 150 sats quality (USDC equivalent) per generation, chosen by the request's mode. No account or API key: the x402 (USDC on Base) or L402 (Lightning) payment is the auth.",
        "inputSchema": {
          "properties": {
            "aspect_ratio": {
              "description": "Output image aspect ratio (default \"1:1\").",
              "enum": [
                "1:1",
                "3:4",
                "16:9"
              ],
              "type": "string"
            },
            "mode": {
              "description": "Generation quality tier - \"standard\" (default, cheaper) or \"quality\" (higher fidelity, costs more).",
              "enum": [
                "standard",
                "quality"
              ],
              "type": "string"
            },
            "prompt": {
              "description": "Text description of the image to generate (max 2000 characters).",
              "maxLength": 2000,
              "type": "string"
            }
          },
          "required": [
            "prompt"
          ],
          "type": "object"
        },
        "toolName": "generate_meme",
        "transport": "streamable-http",
        "type": "mcp"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "description": {
              "type": "string"
            },
            "inputSchema": {
              "type": "object"
            },
            "toolName": {
              "type": "string"
            },
            "transport": {
              "enum": [
                "streamable-http"
              ],
              "type": "string"
            },
            "type": {
              "const": "mcp",
              "type": "string"
            }
          },
          "required": [
            "type",
            "toolName",
            "inputSchema"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://mcp.memestack.ai/mcp#generate_meme#generate_meme"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://mcp.memestack.ai/mcp#generate_meme#generate_meme");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://mcp.memestack.ai/mcp#generate_meme#generate_meme")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header