x402 Triage MCP

x402-triage-mcp

[](https://github.com/TateLyman/x402-triage-mcp/actions/workflows/ci.yml)

MCP server for no-payment x402 surface triage, 402 Index health checks, and paid review handoff.

It exposes three MCP tools:

• triage_x402_surface checks one public x402, MPP, Pay.sh, OpenAPI, manifest, or HTTP 402 endpoint through the Tate Programs public triage API.
• watch_402_index searches public 402 Index metadata for provider health, payment-validity, and domain-verification signals.
• x402_paid_paths returns the paid x402 API endpoints, service catalog, AgentCard, and fixed-scope review links.

The tools do not send X-PAYMENT, wallet signatures, API keys, private credentials, or paid calls.

Tool page: https://tateprograms.com/x402-surface-check.html

Paid x402 API catalog: https://tateprograms.com/services.json

AgentCard: https://the402.tateprograms.com/.well-known/agent-card.json

Install

Run directly with npx:

npx --yes x402-triage-mcp

MCP Config

Add this server to an MCP client that supports stdio servers:

{
  "mcpServers": {
    "x402-triage": {
      "command": "npx",
      "args": ["--yes", "--package", "x402-triage-mcp", "x402-triage-mcp"]
    }
  }
}

STDIO MCP client config launches a local command. Review the command, args, and any env values before running generated configs, and pin versions when repeatability matters.

Tools

triage_x402_surface

{
  "url": "https://api.example.com/.well-known/x402",
  "method": "GET",
  "origin": "https://app.example.com"
}

Returns status, payment headers, parsed challenge summary, attack-class checks, findings, and paid handoff paths.

watch_402_index

{
  "q": "example.com",
  "protocol": "x402",
  "limit": 10
}

Returns matching public 402 Index records, health summary, visible launch blockers, and paid handoff paths.

x402_paid_paths

Returns:

• https://the402.tateprograms.com/api/x402/triage
• https://the402.tateprograms.com/api/x402/index-watch
• https://tateprograms.com/services.json
• https://tateprograms.com/x402-five-attack-review.html
• https://tateprograms.com/x402-fix-sprint.html

Payment And Safety Boundary

Use this server only on public launch surfaces that you own or are authorized to inspect. Do not submit private URLs, tokenized URLs, customer data, wallet seed phrases, or production secrets.

This MCP server is read-only. It does not initiate payments, send X-PAYMENT headers, sign wallet messages, call paid endpoints, create invoices, settle balances, or grant purchasing authority. The only paid paths it returns are static Tate Programs handoff URLs for teams that choose to buy a separate review.

For agent-commerce reviews, the server reports whether the target surface exposes the safety controls buyers expect before real spend is enabled:

• Spend limits: per-call and total budget caps should be explicit before an agent can pay.
• Approval checkpoints: payment setup and high-risk spend should require a visible user or policy approval step.
• Recipient validation: paid requests should be constrained to expected domains, merchants, wallet addresses, or signed registry entries.
• Replay protection: challenges and settlement callbacks should use nonces, expirations, idempotency keys, signed resources, or equivalent controls.
• Metadata minimization: payment metadata should avoid private user context, secrets, and unnecessary resource detail.
• Receipts and audit trails: successful payments should produce transaction IDs, recipient, amount, reason, and policy evidence.

Development

npm install
npm run check

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: TateLyman
• Source: TateLyman/x402-triage-mcp
• License: MIT

Install and usage instructions live in the source repository linked above.