# x402_payment_fraud_detector

Risk-focused tool that analyzes x402-USDC payment transactions for fraud patterns using on-chain forensics. Takes a transaction hash or wallet address as input and returns risk scores, suspicious indicators, and historical patterns. Designed for risk management teams to quickly assess payment legitimacy. Includes keywords: fraud detection, USDC risk, blockchain forensics, transaction monitoring. pass async:true to avoid timeout.

Agent View of the PolicyLayer registry record for `x402_payment_fraud_detector`. HTML page: https://policylayer.com/tools/io-github-getgapup-mcp-knowledge/x402-payment-fraud-detector

## Facts

- Tool: `x402_payment_fraud_detector`
- Server: Mcp Knowledge (`https://mcp.gapup.io`) — https://policylayer.com/tools/io-github-getgapup-mcp-knowledge.md
- Homepage: https://github.com/getgapup/gapup-mcp
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 5 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `async` | boolean | no | If true, returns a job_id immediately (<200ms) instead of waiting for the result. Poll the result with job_result(job_id). Use for slow tools to avoid client ti |
| `walletAddress` | string | no |  |
| `includeHistory` | boolean | no |  |
| `amountThreshold` | number | no |  |
| `transactionHash` | string | yes |  |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "x402_payment_fraud_detector",
    "arguments": {
      "transactionHash": "<transactionHash>"
    }
  }
}
```

## Why x402_payment_fraud_detector is rated Low

The tool reads and analyzes on-chain transaction data, returning risk scores and indicators. It does not move money, execute transactions, or modify data — it is purely an analytical/forensic read operation. Severity is medium because it handles sensitive financial transaction data and wallet addresses, and misuse could expose private financial patterns or be used to evade fraud detection.

From the tool's own definition: "analyzes x402-USDC payment transactions for fraud patterns... returns risk scores, suspicious indicators, and historical patterns"

## Use case

AI agents call x402_payment_fraud_detector to retrieve information from Mcp Knowledge without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Mcp Knowledge:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "x402_payment_fraud_detector": {}
  }
}
```

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## For agents

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- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-getgapup-mcp-knowledge · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-getgapup-mcp-knowledge