MCP MeasureMCP Measure

index observed

FOXIFY Agent Authority + Payment Preflight

x402 agent preflight: exact action authority plus payment mandate, destination, expiry and replay.

Should I use this

Quality & Safety

A
Description quality
90%
Schema completeness
69%
Naming quality
93%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Findings (1)

  • LOWTool 'foxify_preflight_info' description lacks action verbin foxify_preflight_info

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~1,033Tokens (tool definitions)
~3.9 KBTypical response size
Moderate attention impact (0.81% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "foxify-x402-agent-commerce-payment-preflight": {
      "url": "https://xqmokxkbgewocuiinnot.supabase.co/functions/v1/foxify-agent-commerce-mcp"
    }
  }
}

Remote endpoints

https://xqmokxkbgewocuiinnot.supabase.co/functions/v1/foxify-agent-commerce-mcpstreamable-http

What it can do

Tool inventory

Tools (3)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
⚪foxify_preflight_info

Free metadata for FOXIFY machine-payable authority preflight tools.

Input Schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪verify_agent_payment_intent(intent_id, nonce, expires_at, agent, merchant, ...)

Paid transaction preflight. Checks mandate, amount, destination, merchant, expiry and replay risk before an autonomous payment executes. Costs $0.05 USDC on Base.

Input Schema

{
  "type": "object",
  "properties": {
    "intent_id": {
      "type": "string",
      "minLength": 1,
      "description": "Unique payment-intent identifier"
    },
    "nonce": {
      "type": "string",
      "minLength": 8,
      "description": "Unique anti-replay nonce"
    },
    "expires_at": {
      "type": "string",
      "description": "ISO-8601 intent expiry"
    },
    "agent": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string"
        },
        "signature_verified": {
          "type": "boolean"
        }
      },
      "additionalProperties": true
    },
    "merchant": {
      "type": "object",
      "properties": {
        "domain": {
          "type": "string",
          "minLength": 1
        },
        "expected_recipient": {
          "type": "string"
        }
      },
      "required": [
        "domain"
      ],
      "additionalProperties": true
    },
    "payment": {
      "type": "object",
      "properties": {
        "network": {
          "type": "string"
        },
        "currency": {
          "type": "string"
        },
        "amount": {
          "type": [
            "string",
            "number"
          ]
        },
        "recipient": {
          "type": "string"
        }
      },
      "required": [
        "network",
        "currency",
        "amount",
        "recipient"
      ],
      "additionalProperties": true
    },
    "authorization": {
      "type": "object",
      "properties": {
        "max_amount": {
          "type": [
            "string",
            "number"
          ]
        },
        "expected_recipient": {
          "type": "string"
        },
        "allowed_domains": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "human_confirmed": {
          "type": "boolean"
        }
      },
      "required": [
        "max_amount"
      ],
      "additionalProperties": true
    }
  },
  "required": [
    "intent_id",
    "nonce",
    "expires_at",
    "merchant",
    "payment",
    "authorization"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪verify_agent_action_intent(action_id, nonce, expires_at, subject, action, ...)

Paid exact-action authority preflight for consequential agent tool calls. Binds subject, tool, operation, target, canonical parameters, authority lifetime, retries and postcondition requirements. Costs $0.25 USDC on Base.

Input Schema

{
  "type": "object",
  "properties": {
    "action_id": {
      "type": "string",
      "minLength": 1,
      "description": "Unique action-intent identifier"
    },
    "nonce": {
      "type": "string",
      "minLength": 8,
      "description": "Unique anti-replay nonce"
    },
    "expires_at": {
      "type": "string",
      "description": "ISO-8601 action-intent expiry"
    },
    "subject": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string",
          "minLength": 1
        },
        "identity_verified": {
          "type": "boolean"
        }
      },
      "required": [
        "id"
      ],
      "additionalProperties": true
    },
    "action": {
      "type": "object",
      "properties": {
        "tool": {
          "type": "string",
          "minLength": 1
        },
        "operation": {
          "type": "string",
          "minLength": 1
        },
        "consequence": {
          "type": "string",
          "enum": [
            "read",
            "write",
            "send",
            "deploy",
            "payment",
            "delete",
            "account_mutation",
            "external_submission",
            "device_mutation"
          ]
        },
        "target": {
          "type": "object",
          "properties": {
            "kind": {
              "type": "string",
              "minLength": 1
            },
            "id": {
              "type": "string",
              "minLength": 1
            }
          },
          "required": [
            "kind",
            "id"
          ],
          "additionalProperties": true
        },
        "parameters": {
          "type": "object",
          "additionalProperties": {}
        }
      },
      "required": [
        "tool",
        "operation",
        "consequence",
        "target"
      ],
      "additionalProperties": true
    },
    "authority": {
      "type": "object",
      "properties": {
        "expires_at": {
          "type": "string"
        },
        "subject_id": {
          "type": "string",
          "minLength": 1
        },
        "attestation_verified": {
          "type": "boolean"
        },
        "allowed_tools": {
          "type": "array",
          "items": {
            "type": "string",
            "minLength": 1
          },
          "minItems": 1
        },
        "allowed_operations": {
          "type": "array",
          "items": {
            "type": "string",
            "minLength": 1
          },
          "minItems": 1
        },
        "allowed_targets": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "kind": {
                "type": "string",
                "minLength": 1
              },
              "id": {
                "type": "string",
                "minLength": 1
              }
            },
            "required": [
              "kind",
              "id"
            ],
            "additionalProperties": true
          },
          "minItems": 1
        },
        "expected_parameters_hash": {
          "type": "string"
        },
        "human_confirmation_required": {
          "type": "boolean"
        },
        "human_confirmed": {
          "type": "boolean"
        },
        "max_attempts": {
          "type": "integer",
          "exclusiveMinimum": 0
        },
        "allow_retry": {
          "type": "boolean"
        },
        "postcondition_required": {
          "type": "boolean"
        }
      },
      "required": [
        "expires_at",
        "subject_id",
        "allowed_tools",
        "allowed_operations",
        "allowed_targets"
      ],
      "additionalProperties": true
    },
    "execution": {
      "type": "object",
      "properties": {
        "attempt": {
          "type": "integer",
          "exclusiveMinimum": 0
        },
        "prior_outcome": {
          "type": "string",
          "enum": [
            "NONE",
            "KNOWN_NO_EFFECT",
            "EFFECT_CONFIRMED",
            "UNKNOWN"
          ]
        },
        "retry_authorized": {
          "type": "boolean"
        },
        "idempotency_key": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "postcondition": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "minLength": 1
        },
        "authoritative_source": {
          "type": "string",
          "minLength": 1
        }
      },
      "required": [
        "type",
        "authoritative_source"
      ],
      "additionalProperties": true
    }
  },
  "required": [
    "action_id",
    "nonce",
    "expires_at",
    "subject",
    "action",
    "authority"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Recorded Call Examples

1 / 4
Prompt: Example call to verify_agent_payment_intent
Tool: verify_agent_payment_intent
Input Parameters
{
  "intent_id": "example-1",
  "nonce": "example-1",
  "expires_at": "example-1",
  "agent": {},
  "merchant": {},
  "payment": {},
  "authorization": {}
}
Output Result
{
  "result": {
    "content": [
      {
        "type": "text",
        "text": "MCP error -32602: Input validation error: Invalid arguments for tool verify_agent_payment_intent: Required at merchant.domain\nRequired at payment.network\nRequired at payment.currency\nRequired at payment.recipient\nInvalid input at payment.amount\nInvalid input at authorization.max_amount"
      }
    ],
    "isError": true
  },
  "durationMs": 720
}
Duration: 720ms

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Evidence

Recent observations

verifiedversion not recorded3 tools
verifiedversion not recorded2 tools