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Security audit

x402 (official examples)

Security checks for vulnerabilities and agentic risk

Overview

This is a documentation-only payment integration skill with disclosed wallet-key and external facilitator use that fits its stated purpose.

Before installing or using the examples, treat wallet private keys as sensitive, prefer testnet first, verify facilitator and package sources, use spending limits or dedicated wallets, and avoid exposing demo servers publicly unless intentionally configured.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (2)

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 96)May include surrounding context.

md
| Name | URL | Notes |
|------|-----|-------|
| x402.org | `https://x402.org/facilitator` | Default, testnet only |
| Coinbase | `https://api.cdp.coinbase.com/platform/v2/x402` | Production |
| PayAI | `https://facilitator.payai.network` | Production |
| Corbits | `https://facilitator.corbits.dev` | Production |
| x402rs | `https://facilitator.x402.rs` | Production |

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 104)May include surrounding context.

md
| Heurist | `https://facilitator.heurist.xyz` | Production |
| Kobaru | `https://gateway.kobaru.io` | Production |
| Mogami | `https://facilitator.mogami.tech` | Production |
| Nevermined | `https://api.live.nevermined.app/api/v1/` | Production |
| Openfacilitator | `https://pay.openfacilitator.io` | Production |
| Solpay | `https://x402.solpay.cash` | Production |
| Primer | `https://x402.primer.systems` | Production |

Static analysis

No suspicious patterns detected.