Koskamo

MCP x402

An MCP server that performs evidence-backed web verification for AI agents, analyzing public URLs to verify offer terms, seller trust, and policy compliance using x402 micropayments on Base.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

MCP x402 logo, by Diogoup26Community listingStreamable HTTPNo sign-inEndpoint checked 2026-11-07Published by Diogoup26
You need:no account or subscription required
MCP endpoint (Streamable HTTP)
https://mcp-x402-production.up.railway.app/mcp
Vendor documentation

What its tools do

4 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (4)

4 of 4 have a description · 4 of 4 declare behavior hints · 4 of 4 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Verify offer terms on a product page
  • Check seller trust and authorization status
  • Validate policy compliance for pre-purchase checks

Source and maintenance

Community listingRegistry 1.2.12
mcp-registry: io.github.Diogoup26/mcp-x402@1.2.12Source repository
Maintenance checked

Protocol and capabilities

Server
mcp-x402 1.2.12
MCP protocol negotiated in check
2025-11-25
Tools
4 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Tools

4 advertised

preview_verification — Preview an evidence-backed verification for free
Advertised by the server during the last successful anonymous check.
Advertised read-only

Use this free static preview before paying for verificar_condicoes. Choose offer_terms to inspect warranty, returns and availability; seller_trust to inspect seller identity and authorization; or policy_compliance to inspect required policy terms. It performs no web request, OpenAI call or payment and returns a realistic structured example plus the exact paid next step. PT: Pré-visualização gratuita e estática da verificação.

preview_verification input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "useCase": {
      "enum": [
        "offer_terms",
        "seller_trust",
        "policy_compliance"
      ],
      "type": "string",
      "description": "Static example to return: offer_terms, seller_trust or policy_compliance. Defaults to offer_terms."
    }
  }
}
preview_verification output schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "kind",
    "useCase",
    "label",
    "liveRequestPerformed",
    "openAiUsed",
    "paymentRequired",
    "paidTool",
    "paidEndpoint",
    "preflightEndpoint",
    "price",
    "network",
    "exampleInput",
    "exampleOutput",
    "nextStep"
  ],
  "properties": {
    "kind": {
      "type": "string",
      "const": "static_example"
    },
    "label": {
      "type": "string"
    },
    "price": {
      "type": "string"
    },
    "network": {
      "type": "string"
    },
    "useCase": {
      "enum": [
        "offer_terms",
        "seller_trust",
        "policy_compliance"
      ],
      "type": "string"
    },
    "nextStep": {
      "type": "string"
    },
    "paidTool": {
      "type": "string",
      "const": "verificar_condicoes"
    },
    "openAiUsed": {
      "type": "boolean",
      "const": false
    },
    "exampleInput": {
      "type": "object",
      "required": [
        "url",
        "condicoes"
      ],
      "properties": {
        "url": {
          "type": "string",
          "format": "uri",
          "maxLength": 2048,
          "description": "URL HTTP ou HTTPS pública onde as condições serão verificadas. Endereços locais, privados e não públicos são rejeitados."
        },
        "contexto": {
          "type": "string",
          "maxLength": 500,
          "description": "Contexto opcional, até 500 caracteres, usado apenas para interpretar as condições e nunca como prova da página."
        },
        "condicoes": {
          "type": "array",
          "items": {
            "type": "string",
            "maxLength": 300,
            "minLength": 3
          },
          "maxItems": 10,
          "minItems": 1,
          "description": "Lista de 1 a 10 condições concretas e verificáveis; cada condição deve ter entre 3 e 300 caracteres."
        }
      },
      "additionalProperties": false
    },
    "paidEndpoint": {
      "type": "string",
      "format": "uri"
    },
    "exampleOutput": {
      "type": "object",
      "required": [
        "source",
        "title",
        "verifiedAt",
        "decisao",
        "verificationId",
        "pageHash"
      ],
      "properties": {
        "title": {
          "type": "string"
        },
        "source": {
          "type": "string",
          "format": "uri"
        },
        "decisao": {
          "type": "object",
          "required": [
            "decisao",
            "condicoes",
            "resumo"
          ],
          "properties": {
            "resumo": {
              "type": "string"
            },
            "decisao": {
              "enum": [
                "confirmado",
                "rejeitado",
                "incerto"
              ],
              "type": "string"
            },
            "condicoes": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "condicao",
                  "estado",
                  "prova",
                  "explicacao"
                ],
                "properties": {
                  "prova": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "estado": {
                    "enum": [
                      "confirmada",
                      "rejeitada",
                      "incerta"
                    ],
                    "type": "string"
                  },
                  "condicao": {
                    "type": "string"
                  },
                  "explicacao": {
                    "type": "string"
                  }
                },
                "additionalProperties": false
              }
            }
          },
          "additionalProperties": false
        },
        "pageHash": {
          "type": "string",
          "pattern": "^sha256:[a-f0-9]{64}$"
        },
        "verifiedAt": {
          "type": "string"
        },
        "verificationId": {
          "type": "string",
          "format": "uuid",
          "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$"
        }
      },
      "additionalProperties": false
    },
    "paymentRequired": {
      "type": "boolean",
      "const": false
    },
    "preflightEndpoint": {
      "type": "string",
      "format": "uri"
    },
    "liveRequestPerformed": {
      "type": "boolean",
      "const": false
    }
  },
  "additionalProperties": false
}
preview_verification annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "destructiveHint": false
}
consultar_ia — General AI consultation
Advertised by the server during the last successful anonymous check.
Advertised read-only

Use for general questions that do not require live web retrieval. Returns a concise model answer and does not fetch URLs or verify current facts. Use analisar_url for a source-bounded page report and verificar_condicoes for evidence-backed decisions. PT: Use para perguntas gerais sem pesquisa web em tempo real.

consultar_ia input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "prompt"
  ],
  "properties": {
    "prompt": {
      "type": "string",
      "maxLength": 4000,
      "minLength": 1,
      "description": "Pergunta ou instrução, entre 1 e 4000 caracteres. Não pressupõe pesquisa web em tempo real."
    }
  }
}
consultar_ia output schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "answer"
  ],
  "properties": {
    "answer": {
      "type": "string"
    }
  },
  "additionalProperties": false
}
consultar_ia annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "destructiveHint": false
}
analisar_url — Analyze a public web page
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

Use to fetch one public HTTP or HTTPS page and return a source-bounded report with summary, facts, risks and recommended actions. The optional objective controls focus but is never evidence. It does not consult other sources; use verificar_condicoes for condition-by-condition decisions. PT: Analisa uma página pública sem usar fontes externas.

analisar_url input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048,
      "description": "URL HTTP ou HTTPS pública a extrair. Endereços locais, privados e não públicos são rejeitados."
    },
    "objetivo": {
      "type": "string",
      "maxLength": 500,
      "description": "Foco opcional do relatório, até 500 caracteres; orienta a análise mas não é tratado como prova."
    }
  }
}
analisar_url output schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "source",
    "title",
    "report"
  ],
  "properties": {
    "title": {
      "type": "string"
    },
    "report": {
      "type": "string"
    },
    "source": {
      "type": "string",
      "format": "uri"
    }
  },
  "additionalProperties": false
}
analisar_url annotations
{
  "readOnlyHint": true,
  "openWorldHint": true,
  "destructiveHint": false
}
verificar_condicoes — Verify conditions with evidence
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

Use before an agent trusts, buys or acts to test 1 to 10 explicit conditions against one public HTTP or HTTPS page. Best fits offer and warranty checks, seller identity or authorization checks, and policy compliance checks. Returns confirmed, rejected or uncertain for every condition with textual evidence when available, plus source, verifiedAt, verificationId and pageHash. Missing evidence produces uncertain, not a false confirmation. Use preview_verification first when the buyer needs a free example. PT: Verifica condições com prova auditável.

verificar_condicoes input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "url",
    "condicoes"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048,
      "description": "URL HTTP ou HTTPS pública onde as condições serão verificadas. Endereços locais, privados e não públicos são rejeitados."
    },
    "contexto": {
      "type": "string",
      "maxLength": 500,
      "description": "Contexto opcional, até 500 caracteres, usado apenas para interpretar as condições e nunca como prova da página."
    },
    "condicoes": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 300,
        "minLength": 3
      },
      "maxItems": 10,
      "minItems": 1,
      "description": "Lista de 1 a 10 condições concretas e verificáveis; cada condição deve ter entre 3 e 300 caracteres."
    }
  }
}
verificar_condicoes output schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "source",
    "title",
    "verifiedAt",
    "decisao",
    "verificationId",
    "pageHash"
  ],
  "properties": {
    "title": {
      "type": "string"
    },
    "source": {
      "type": "string",
      "format": "uri"
    },
    "decisao": {
      "type": "object",
      "required": [
        "decisao",
        "condicoes",
        "resumo"
      ],
      "properties": {
        "resumo": {
          "type": "string"
        },
        "decisao": {
          "enum": [
            "confirmado",
            "rejeitado",
            "incerto"
          ],
          "type": "string"
        },
        "condicoes": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "condicao",
              "estado",
              "prova",
              "explicacao"
            ],
            "properties": {
              "prova": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "estado": {
                "enum": [
                  "confirmada",
                  "rejeitada",
                  "incerta"
                ],
                "type": "string"
              },
              "condicao": {
                "type": "string"
              },
              "explicacao": {
                "type": "string"
              }
            },
            "additionalProperties": false
          }
        }
      },
      "additionalProperties": false
    },
    "pageHash": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "verifiedAt": {
      "type": "string"
    },
    "verificationId": {
      "type": "string",
      "format": "uuid",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$"
    }
  },
  "additionalProperties": false
}
verificar_condicoes annotations
{
  "readOnlyHint": true,
  "openWorldHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
889 ms
95th percentile latency
889 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 889 ms · metadata changed · 4 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http mcp-x402 https://mcp-x402-production.up.railway.app/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add mcp-x402 --url https://mcp-x402-production.up.railway.app/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable mcp-x402 in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "mcp-x402": {
      "url": "https://mcp-x402-production.up.railway.app/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "mcp-x402": {
      "type": "streamableHttp",
      "url": "https://mcp-x402-production.up.railway.app/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start mcp-x402 and inspect its tools.
VS Code configuration
{
  "servers": {
    "mcp-x402": {
      "type": "http",
      "url": "https://mcp-x402-production.up.railway.app/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http mcp-x402 https://mcp-x402-production.up.railway.app/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://mcp-x402-production.up.railway.app/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "mcp-x402": {
      "serverUrl": "https://mcp-x402-production.up.railway.app/mcp"
    }
  }
}

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