What is fidacy-payment-firewall?

A payment firewall for AI agents that produces a signed, checkable decision for each money-moving action.

Use it to check and approve agent payments and to keep independently verifiable evidence of each decision.

It helps stop payments to the wrong recipient, payments above a limit, and duplicate invoices before they are completed. It does not hold or move funds.

fidacy-payment-firewall — Plugin for Claude Code by lucaslubi

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/lucaslubi/fidacy-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/lucaslubi/fidacy-mcp/fidacy-payment-firewall/github.svg)](https://agentmods.dev/plugins/lucaslubi/fidacy-mcp/fidacy-payment-firewall)

Your own site

<a href="https://agentmods.dev/plugins/lucaslubi/fidacy-mcp/fidacy-payment-firewall"><img src="https://agentmods.dev/badge/plugins/lucaslubi/fidacy-mcp/fidacy-payment-firewall/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/lucaslubi/fidacy-mcp/fidacy-payment-firewall"><img src="https://agentmods.dev/badge/plugins/lucaslubi/fidacy-mcp/fidacy-payment-firewall.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 2 skills, 2 hooks, 1 MCP server cost 137 tokens a session between them.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

fidacy-payment-firewall scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugin/fidacy-payment-firewall/.claude-plugin/plugin.json · 32 lines

What it actually says

{
  "name": "fidacy-payment-firewall",
  "version": "1.0.1",
  "description": "Payment firewall for AI agents: a signed, verifiable verdict on every money-moving action. Blocks wrong/lookalike payee, over-cap, and duplicate-invoice fraud before it settles. Non-custodial, local-first.",
  "author": {
    "name": "Zeepcode Group",
    "url": "https://fidacy.com"
  },
  "homepage": "https://fidacy.com",
  "license": "Apache-2.0",
  "keywords": [
    "mcp",
    "payments",
    "security",
    "firewall",
    "trust",
    "verdict",
    "ed25519",
    "agents"
  ],
  "mcp": {
    "servers": {
      "fidacy": {
        "command": "npx",
        "args": [
          "-y",
          "@fidacy/mcp"
        ]
      }
    }
  }
}

Contents

What it installs

The manifest is a name and a version. 2 skills, 2 hooks, 1 MCP server travel with it, and installing the plugin installs all of them — 137 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 32 lines scan A b49296f81084

Subscribe to this mod's changes

fidacy-payment-firewall is a plugin published in the GitHub repository lucaslubi/fidacy-mcp (1 stars, last pushed 1mo ago), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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