Index onlineMerchant portal
Api Endpoint

x402-gateway

Mermaid Diagram Renderer: Render a Mermaid diagram to an image (PNG or SVG). Returns a base64-encoded image (MCP content type image). Options: format (png|svg), theme (default|dark|forest|neutral), scale (1-4, PNG only). Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/mermaid.

Open interactive test console

Offering

Provider
x402.freeq.one
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Creative
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://x402.freeq.one/tools/mermaid
MIME type
application/json
First seen
2026-10-16T01:50:06.715Z
Last seen
Tags
MCP, pay-per-call, X402, USDC, Base

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0x90b0dC893406d6eA63bb077ED59F5e8340f98d84"
  }
]

Observed health

Status
Healthy
Latest latency
97 ms
Average latency
106 ms
HTTP status
204
Last checked
Reachability
100% over 13 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "description": "JSON request body. See GET /tools for the parameter catalog.",
      "properties": {
        "code": {
          "description": "Mermaid diagram source code, e.g. 'graph TD; A-->B'. Max 50000 chars.",
          "example": "graph TD\n  A[Client] -->|402| B[x402 Gateway]\n  B -->|settle| C[USDC on Base]\n  B -->|forward| D[Upstream API]",
          "type": "string"
        },
        "format": {
          "description": "Output format (default png). SVG returns vector text.",
          "enum": [
            "png",
            "svg"
          ],
          "example": "svg",
          "type": "string"
        },
        "scale": {
          "description": "Raster scale 1-4, PNG only (default 2).",
          "example": 2,
          "type": "number"
        },
        "theme": {
          "description": "Mermaid theme (default 'default').",
          "enum": [
            "default",
            "dark",
            "forest",
            "neutral"
          ],
          "example": "default",
          "type": "string"
        }
      },
      "type": "object"
    },
    "bodyType": {
      "enum": [
        "json",
        "form-data",
        "text"
      ],
      "type": "string"
    },
    "description": {
      "type": "string"
    },
    "headers": {
      "additionalProperties": {
        "type": "string"
      },
      "type": "object"
    },
    "mcpServerUrl": {
      "type": "string"
    },
    "method": {
      "enum": [
        "POST"
      ],
      "type": "string"
    },
    "queryParams": {
      "additionalProperties": {
        "type": "string"
      },
      "type": "object"
    },
    "toolName": {
      "type": "string"
    },
    "transport": {
      "type": "string"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "type": "object"
}

Output 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": {
            "code": {
              "type": "string",
              "example": "graph TD\n  A[Client] -->|402| B[x402 Gateway]\n  B -->|settle| C[USDC on Base]\n  B -->|forward| D[Upstream API]",
              "description": "Mermaid diagram source code, e.g. 'graph TD; A-->B'. Max 50000 chars."
            },
            "scale": {
              "type": "number",
              "example": 2,
              "description": "Raster scale 1-4, PNG only (default 2)."
            },
            "theme": {
              "enum": [
                "default",
                "dark",
                "forest",
                "neutral"
              ],
              "type": "string",
              "example": "default",
              "description": "Mermaid theme (default 'default')."
            },
            "format": {
              "enum": [
                "png",
                "svg"
              ],
              "type": "string",
              "example": "svg",
              "description": "Output format (default png). SVG returns vector text."
            }
          },
          "description": "JSON request body. See GET /tools for the parameter catalog."
        },
        "type": {
          "type": "string",
          "const": "http"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "headers": {
          "type": "object",
          "additionalProperties": {
            "type": "string"
          }
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "toolName": {
          "type": "string"
        },
        "transport": {
          "type": "string"
        },
        "description": {
          "type": "string"
        },
        "queryParams": {
          "type": "object",
          "additionalProperties": {
            "type": "string"
          }
        },
        "mcpServerUrl": {
          "type": "string"
        }
      },
      "additionalProperties": false
    },
    "output": {
      "type": "object",
      "required": [
        "type"
      ],
      "properties": {
        "type": {
          "type": "string",
          "const": "json"
        },
        "example": {
          "type": "object",
          "properties": {
            "content": {
              "type": "array"
            },
            "isError": {
              "type": "boolean"
            },
            "structuredContent": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}