How to Monetize Security MCP Servers with x402

Agents create a new, recurring security workload. Every package an agent considers installing, every command it's about to run, every chunk of untrusted text entering its context is a checkpoint where a scan makes sense — and agents hit those checkpoints constantly. shellward's seven tools (injection detection, PII scanning, command safety, DLP) are designed for exactly that inline-check pattern, and inline checks are inherently per-call events.

The buyer-side math is forgiving. An agent operator paying $0.05 to scan a dependency tree is insuring against supply-chain compromise; the price could be ten times higher and still be rational. Security is where you should be least shy about pricing above the minimum.

Lightweight verdicts — is this string an injection attempt, does this command look destructive — are high-frequency and belong at $0.01 to $0.02; their value comes from volume, since an agent might call them on every step. Deeper scans price higher: a skylos-style pass over a codebase for secrets and dead code, or a vulnerability scan of a manifest, plausibly runs $0.05 to $0.25 per scan depending on scope.

Heavy analysis tops the range. A wireshark-mcp packet-capture deep-dive consumes real compute and expertise encoded in the tooling — per-analysis pricing from $0.25 upward tracks what the equivalent consulting minute costs. As elsewhere, give each tool its own price rather than averaging across the menu; x402 quotes the price per tool in the 402 response, so granularity is free.

Loomal's Security category has 378 live listings, each pre-built from the registry and claimable by the repository owner. Verify through GitHub, set per-call prices in the console (floor: $0.01, no free tier), and connect your remote endpoint so the marketplace shows your real tool list. For security servers the published tool list doubles as a trust signal — buyers can see exactly what your scanner exposes before sending it anything sensitive.

Settlement is in USDC on Base with Ed25519-signed receipts on every call, and the receipts matter more here than in most categories: they're an audit trail of when each scan was bought and run. Loomal's 5% fee on settled transactions is currently waived.

A paid security tool gets scrutinized harder than a free one. Three things shorten the buyer's evaluation: a claimed listing (unclaimed listings signal nobody is accountable), an open-source repository even if the hosted endpoint is paid, and tight tool schemas that show you only request the data a scan needs. It's also worth stating your data handling plainly — a scanner that sees commands and code should say what it retains. The x402 receipt proves the payment; your listing has to prove the operator.