Roundhouse

x402-gateway

x402-gateway tool: mermaid (market: bazaar)

DataLiveeip155:8453Exactvia cdp
https://x402.freeq.one/market/bazaar/tools/mermaid
McpPay-per-callMermaidBazaar
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 3 snapshots so far.
$96.74
Verified settled volume
2,201 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-26 03:25Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x90b0dC893406d6eA63bb077ED59F5e8340f98d84

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required — use POST to call this tool",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USDC",
        "version": "2"
      },
      "payTo": "0x90b0dC893406d6eA63bb077ED59F5e8340f98d84",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://x402.freeq.one/market/bazaar/tools/mermaid",
    "description": "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).",
    "serviceName": "x402-gateway"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "mcp",
          "toolName": "mermaid",
          "transport": "streamable-http",
          "description": "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).",
          "mcpServerUrl": "https://x402.freeq.one/market/bazaar/mcp"
        },
        "output": {
          "type": "json"
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "type": "object",
            "properties": {
              "body": {
                "type": "object",
                "properties": {
                  "tool": {
                    "type": "string",
                    "description": "Tool name (see GET /tools for the catalog)"
                  }
                },
                "description": "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)."
              },
              "tool": {
                "type": "string",
                "description": "Tool name to call"
              },
              "type": {
                "type": "string",
                "const": "mcp"
              },
              "inputSchema": {
                "type": "object",
                "description": "Arguments object matching the tool's input schema (see GET /tools)"
              }
            }
          },
          "output": {
            "type": "object",
            "properties": {
              "type": {
                "type": "string",
                "const": "json"
              },
              "example": {
                "type": "object",
                "properties": {
                  "result": {
                    "description": "Tool output (JSON)"
                  }
                }
              }
            }
          }
        }
      },
      "category": "tool",
      "discoverable": true
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 USDC on Base to 0x90b0…98d84. The signed payment is good for 1 minute.

Paid to
0x90b0…98d84
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
5000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x90b0dC893406d6eA63bb077ED59F5e8340f98d84",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "code": "graph TD\n  A[Client] -->|402| B[x402 Gateway]\n  B -->|settle| C[USDC on Base]\n  B -->|forward| D[Upstream API]",
          "scale": 2,
          "theme": "default",
          "format": "png"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "content": [],
          "isError": false,
          "structuredContent": {}
        }
      }
    },
    "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"
                }
              }
            }
          }
        }
      }
    },
    "resource": "https://x402.freeq.one/market/bazaar/tools/mermaid"
  }
}

Provenance

Seen in the source catalog
2026-10-26 03:25Z
Last indexed by Roundhouse
2026-10-26 17:50Z
Last enriched (probe, favicon, geo)
2026-10-26 10:46Z
x402 version
2
Max timeout
60s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 3 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service x402-gateway and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402-gateway'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://x402.freeq.one/market/bazaar/tools/mermaid, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.