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Security audit

X402 Bazaar

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed protocol guide for AgentPMT x402 payments, with no bundled executable code or hidden persistence.

Install only if you intend to build AgentPMT x402 payment flows. Before signing any wallet authorization, verify the payee, amount, token, chain, nonce, and endpoint, and refresh the skill because its own freshness date is older than seven days.

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 (4)

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 37)May include surrounding context.

md
"credits": 500,
    "payment_method": "x402",
}
first = requests.post("https://www.agentpmt.com/api/external/credits/purchase", json=purchase, timeout=30)
if first.status_code == 402:
    payment_required = first.headers["PAYMENT-REQUIRED"]
    signed_header = "<base64 signed EIP-3009 authorization>"

External Transmission

Medium
Category
Data Exfiltration
Confidence
70% 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 37)May include surrounding context.

md
"credits": 500,
    "payment_method": "x402",
}
first = requests.post("https://www.agentpmt.com/api/external/credits/purchase", json=purchase, timeout=30)
if first.status_code == 402:
    payment_required = first.headers["PAYMENT-REQUIRED"]
    signed_header = "<base64 signed EIP-3009 authorization>"

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 41)May include surrounding context.

md
if first.status_code == 402:
    payment_required = first.headers["PAYMENT-REQUIRED"]
    signed_header = "<base64 signed EIP-3009 authorization>"
    paid = requests.post(
        "https://www.agentpmt.com/api/external/credits/purchase",
        json=purchase,
        headers={"PAYMENT-SIGNATURE": signed_header},

External Transmission

Medium
Category
Data Exfiltration
Confidence
70% 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 41)May include surrounding context.

md
if first.status_code == 402:
    payment_required = first.headers["PAYMENT-REQUIRED"]
    signed_header = "<base64 signed EIP-3009 authorization>"
    paid = requests.post(
        "https://www.agentpmt.com/api/external/credits/purchase",
        json=purchase,
        headers={"PAYMENT-SIGNATURE": signed_header},

Static analysis

No suspicious patterns detected.