# com.blackwalltier/blackwall-x402-guardrail

> com.blackwalltier/blackwall-x402-guardrail — com-blackwalltier-blackwall-x402-guardrail. Use this tool when you need to verify and control payment transactions with a pre-signature x402 payment verdict, enabling AI agents to make informed decisions with a GO/HOLD/STOP outcome and generating a verifiable signed receipt. It solves problems related to secure and trustworthy payment processing, providing a reliable interface for payment validation. Ideal for use cases requiring secure payment verification and control, with inputs including payment details and outputs including a signed receipt and payment verdict.

Canonical page: https://skillsregistry.net/skills/com-blackwalltier-blackwall-x402-guardrail  
JSON: https://api.skillsregistry.net/v1/skills/com-blackwalltier-blackwall-x402-guardrail

## Description

Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.

## Trust

- **Trust score (0–1):** 0.97
- **Verification tier:** verified
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 0.1.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** finance
- **Updated:** 2026-09-19

## Source

- **Source listing:** [MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/com.blackwalltier%2Fblackwall-x402-guardrail)
- **Repository:** <https://github.com/bluetieroperations-create/blackwall-x402-mcp>

## Use it

MCP endpoint published by the skill: `https://mcp.blackwalltier.com`

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "com-blackwalltier-blackwall-x402-guardrail"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/com-blackwalltier-blackwall-x402-guardrail` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/com-blackwalltier-blackwall-x402-guardrail/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt