x402 Counterparty Score MCP

Provides decision-grade counterparty trust scores for the x402 ecosystem, including wash-trading ratios and real-buyer counts, sold to AI agents over MCP with per-call x402 payments in USDC on Base.

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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.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-06Operated by Maine

MCP endpoint (Streamable HTTP)

https://x402score.org/mcp

Vendor documentation

What its tools do

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

2 of 2 have a description · 2 of 2 declare behavior hints · 1 of 1 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 6, 2026, 7:54 PM UTC
Passed Official MCP Registry namespace is tied to x402score.org · Nov 6, 2026, 6:33 PM UTC
Passed Endpoint is on the registry namespace domain · Nov 6, 2026, 6:33 PM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Check trust verdict for an x402 endpoint
Analyze wash-trading ratios
Verify real-buyer counts
Validate response schema with free sample

Source and maintenance

Vendor evidenceRegistry 0.1.0

mcp-registry: org.x402score/counterparty-score@0.1.0 Project website

Protocol and capabilities

Server: x402-counterparty-score 0.0.0
MCP protocol negotiated in check: 2025-11-25
Tools: 2 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": true
  }
}

Tools

2 advertised

score_x402_counterparty

Advertised by the server during the last successful anonymous check.

Advertised read-only

Returns trust verdict (trusted/caution/avoid) with wash-trading ratio, real-buyer count, and repeat-buyer rate for an x402 endpoint URL or pay-to address. $0.02/call. Computed from Base on-chain settlement data and the x402 Bazaar catalog; a score is sold only if refreshed within the past 24 hours.

score_x402_counterparty input schema

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "subject"
  ],
  "properties": {
    "subject": {
      "type": "string",
      "maxLength": 2048,
      "minLength": 1,
      "description": "The counterparty to score: an x402 endpoint URL (e.g. \"https://api.seller.example/quote\") or a pay-to address (e.g. \"0x036C…\"), exactly as advertised in the x402 Bazaar catalog or the 402 handshake."
    }
  }
}

score_x402_counterparty output schema

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "subject",
    "verdict",
    "wash_trading_ratio",
    "real_buyer_count",
    "repeat_buyer_rate",
    "source",
    "updated_at",
    "confidence"
  ],
  "properties": {
    "source": {
      "type": "string",
      "description": "Origin of the underlying data, e.g. \"base-settlements\" or \"bazaar-directory\"."
    },
    "subject": {
      "type": "string",
      "description": "The x402 endpoint URL or pay-to address this score is about."
    },
    "verdict": {
      "enum": [
        "trusted",
        "caution",
        "avoid"
      ],
      "type": "string",
      "description": "Decision-grade trust verdict on the counterparty."
    },
    "delivery": {
      "type": "object",
      "required": [
        "outcome",
        "checked_at"
      ],
      "properties": {
        "outcome": {
          "enum": [
            "delivered",
            "failed"
          ],
          "type": "string",
          "description": "delivered = a real paid test purchase received a valid response; failed = payment was made but no valid goods were delivered."
        },
        "checked_at": {
          "type": "string",
          "description": "ISO 8601 UTC timestamp of the test purchase. Independent of updated_at and may be older."
        }
      },
      "description": "Result of the most recent real-money delivery probe (mystery-shopper purchase from the disclosed probe wallet). Absent if this subject has not been probe-purchased.",
      "additionalProperties": false
    },
    "confidence": {
      "type": "number",
      "maximum": 1,
      "minimum": 0,
      "description": "Objective confidence from rule coverage and data completeness, 0 to 1. Never self-reported by an LLM."
    },
    "updated_at": {
      "type": "string",
      "description": "ISO 8601 UTC timestamp of when this score was computed."
    },
    "real_buyer_count": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": 0,
      "description": "Number of distinct real buyers after wash-trading filtering."
    },
    "repeat_buyer_rate": {
      "type": "number",
      "maximum": 1,
      "minimum": 0,
      "description": "Share of real buyers that purchased more than once, 0 to 1."
    },
    "wash_trading_ratio": {
      "type": "number",
      "maximum": 1,
      "minimum": 0,
      "description": "Share of nominal settlement volume attributed to wash trading (self-dealing or funding-loop patterns), 0 to 1."
    }
  },
  "additionalProperties": false
}

score_x402_counterparty annotations

{
  "readOnlyHint": true
}

get_sample_score

Advertised by the server during the last successful anonymous check.

Advertised read-only

Returns a clearly-marked stale sample counterparty score in the exact response schema of score_x402_counterparty (verdict, wash_trading_ratio, real_buyer_count, repeat_buyer_rate, source, updated_at, confidence). Free, no payment required, no input required. Sample data is fixed and expired by design — use it to validate response parsing, then call score_x402_counterparty ($0.02/call) for fresh decision-grade scores.

get_sample_score input schema

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

get_sample_score output schema

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "subject",
    "verdict",
    "wash_trading_ratio",
    "real_buyer_count",
    "repeat_buyer_rate",
    "source",
    "updated_at",
    "confidence",
    "sample",
    "sample_notice"
  ],
  "properties": {
    "sample": {
      "type": "boolean",
      "const": true,
      "description": "Always true: this response is a sample, not a live score."
    },
    "source": {
      "type": "string",
      "description": "Origin of the underlying data, e.g. \"base-settlements\" or \"bazaar-directory\"."
    },
    "subject": {
      "type": "string",
      "description": "The x402 endpoint URL or pay-to address this score is about."
    },
    "verdict": {
      "enum": [
        "trusted",
        "caution",
        "avoid"
      ],
      "type": "string",
      "description": "Decision-grade trust verdict on the counterparty."
    },
    "delivery": {
      "type": "object",
      "required": [
        "outcome",
        "checked_at"
      ],
      "properties": {
        "outcome": {
          "enum": [
            "delivered",
            "failed"
          ],
          "type": "string",
          "description": "delivered = a real paid test purchase received a valid response; failed = payment was made but no valid goods were delivered."
        },
        "checked_at": {
          "type": "string",
          "description": "ISO 8601 UTC timestamp of the test purchase. Independent of updated_at and may be older."
        }
      },
      "description": "Result of the most recent real-money delivery probe (mystery-shopper purchase from the disclosed probe wallet). Absent if this subject has not been probe-purchased.",
      "additionalProperties": false
    },
    "confidence": {
      "type": "number",
      "maximum": 1,
      "minimum": 0,
      "description": "Objective confidence from rule coverage and data completeness, 0 to 1. Never self-reported by an LLM."
    },
    "updated_at": {
      "type": "string",
      "description": "ISO 8601 UTC timestamp of when this score was computed."
    },
    "sample_notice": {
      "type": "string",
      "description": "Machine-readable warning that the data is stale sample data."
    },
    "real_buyer_count": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": 0,
      "description": "Number of distinct real buyers after wash-trading filtering."
    },
    "repeat_buyer_rate": {
      "type": "number",
      "maximum": 1,
      "minimum": 0,
      "description": "Share of real buyers that purchased more than once, 0 to 1."
    },
    "wash_trading_ratio": {
      "type": "number",
      "maximum": 1,
      "minimum": 0,
      "description": "Share of nominal settlement volume attributed to wash trading (self-dealing or funding-loop patterns), 0 to 1."
    }
  },
  "additionalProperties": false
}

get_sample_score annotations

{
  "readOnlyHint": true
}

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: 1509 ms
95th percentile latency: 1509 ms

Maintenance history

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

Nov 6, 2026, 7:54 PM UTC · probe · passed · 1509 ms · metadata changed · 2 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 x402-counterparty-score-mcp https://x402score.org/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 x402-counterparty-score-mcp --url https://x402score.org/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable x402-counterparty-score-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "x402-counterparty-score-mcp": {
      "url": "https://x402score.org/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "x402-counterparty-score-mcp": {
      "type": "streamableHttp",
      "url": "https://x402score.org/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start x402-counterparty-score-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "x402-counterparty-score-mcp": {
      "type": "http",
      "url": "https://x402score.org/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 x402-counterparty-score-mcp https://x402score.org/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://x402score.org/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": {
    "x402-counterparty-score-mcp": {
      "serverUrl": "https://x402score.org/mcp"
    }
  }
}

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