Mmcp.market

GateCheck by LarryBuildsAI MCP server

by LarryLemonBot·io.github.LarryLemonBot/gatecheck·v0.1.3
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One-cent x402 and MCP readiness checks plus fixed-price marketplace launch packs.

B81/100grade B
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GateCheck by LarryBuildsAI tools (6, 1 write)

write = sends, deletes, buys or posts
  • boundary_guard_checkwrite actionFree

    Create a deterministic, read-only pre-action receipt from request, policy, and optional result evidence. Use before an agent posts, spends, lists, or writes so the decision can be audited; no external action is executed.

  • check_agent_tool_readinessFree

    GateCheck readiness: check whether an x402/agent-facing tool is ready for agent routing, marketplace listing, and paid-path monitoring, including public agent discovery surfaces (/llms.txt, /agents.txt, /.well-known/mcp.json, /mcp). Pass target plus optional tier, marketplace_url, expected_resources, and paid_path; deep/report tiers add unpaid 402 probing when paid_path is supplied. Tiers: quick $1, deep $5, report $10.

  • generate_trust_receiptFree

    Generate a deterministic trust receipt from sanitized request/policy/result/payment summaries. Do not submit raw auth headers, cookies, API keys, private keys, payment signatures, payment response headers, customer prompts, customer documents, or payer-identifying evidence.

  • generate_x402_launch_packFree

    Generate marketplace-safe launch assets for an x402/MCP seller: listing copy, buyer FAQ, checklist, approval packet, and claim boundaries. Pass target plus optional product_name, audience, primary_use_case, marketplace_url, and paid_path; service/premium tiers include readiness evidence. Tiers: single $9, service $29, premium $49.

  • probe_x402_paid_pathFree

    Probe a public x402 paid endpoint without signing or paying, then parse the HTTP 402 challenge. Pass target plus optional expected network/asset/price to verify payment metadata and receive a deterministic health receipt.

  • scan_x402_resourceFree

    Read-only scan of a public API/provider URL for x402, OpenAPI, pricing, and agent-discovery metadata. Pass url, and optionally marketplace_url plus expected_resources, to get a readiness score, issues, and fixes; no private endpoints are called.

Public scan report

scanner v0.1.9 · 2026-09-25 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 217ms20/20
  • Tool poisoning6 tool descriptions checked15/15
  • Auth qualityAPI key sent as a header8/15
  • Maintenancelast push 73 days ago12/15
  • Maintainer identityregistry namespace matches repository owner6/10
Overall 81/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

What the publisher says

From the GateCheck by LarryBuildsAI repository's README, as published. We do not edit it. Read it on GitHub

GateCheck by LarryBuildsAI

GateCheck is a hosted remote MCP server and x402 readiness surface for paid agent-tool sellers.

Use it before public submission, promotion, or paid agent routing to verify that a paid x402 or MCP tool is discoverable, inspectable, and claim-bounded.

Hosted MCP Endpoint

  • Remote MCP URL: https://proofbeforepay.vercel.app/gatecheck/mcp
  • Transport: streamable-http
  • Public introspection: initialize and tools/list
  • Protected tool execution: bearer auth may be required for direct production calls
  • Product homepage: https://proofbeforepay.vercel.app/gatecheck
  • Scorecard: https://github.com/LarryLemonBot/gatecheck/blob/main/scorecard.md
  • Product card: https://proofbeforepay.vercel.app/gatecheck/product-card.md
  • Marketplace index: https://proofbeforepay.vercel.app/gatecheck/marketplaces.json

MCP Client Config

{
  "mcpServers": {
    "gatecheck": {
      "type": "streamable-http",
      "url": "https://proofbeforepay.vercel.app/gatecheck/mcp"
    }
  }
}

If your client supports request headers and you have a GateCheck production token, add:

{
  "Authorization": "Bearer YOUR_GATECHECK_TOKEN"
}

Do not put private keys, wallet secrets, cookies, customer data, or marketplace dashboard credentials into public metadata.

Tools

GateCheck currently exposes six MCP tools:

  • boundaryguardcheck
  • scanx402resource
  • probex402paid_path
  • checkagenttool_readiness
  • generatex402launch_pack
  • generatetrustreceipt

Public tools/list is available so buyers, agents, and directories can inspect the tool inventory before protected calls.

Buy through PayanAgent

These fixed-price offers settle in USDC through PayanAgent and automatically return the purchased GateCheck artifact:

  • Quick x402 readiness check — $0.01 launch price
  • Single-route launch pack — $9
  • Service launch pack — $29
  • Premium marketplace launch pack — $49

Buyer input is validated before PayanAgent presents the payment flow. Generated launch packs contain listing and approval-review artifacts; they do not publish listings, contact buyers, or claim marketplace endorsement.

What GateCheck Checks

  • Product-scoped discovery: homepage, llms.txt, agents.txt, product card, skill card, sitemap, and MCP server card.
  • MCP inventory: public initialize and tool-list introspection.
  • x402 behavior: unpaid 402 challenge metadata without submitting payment signatures or moving funds.
  • Listing readiness: buyer-facing copy, prices, evidence links, launch-pack artifacts, and claim boundaries.

Claim Boundary

GateCheck reports and receipts prove observed public metadata, unpaid 402 behavior, request summaries, hashes, and returned artifacts only.

They do not prove marketplace endorsement, settlement, security certification, custody, KYC/AML coverage, buyer adoption, or downstream execution.

Product Boundary

GateCheck is separate from Signal Desk and ResultRail.

This repository is the public distribution and marketplace-submission surface for GateCheck only.

Current Public Visibility

Verified public surfaces include:

  • GateCheck remote MCP endpoint: https://proofbeforepay.vercel.app/gatecheck/mcp
  • Official MCP Registry: https://registry.modelcontextprotocol.io/v0.1/servers?search=io.github.LarryLemonBot/gatecheck
  • Smithery: https://smithery.ai/servers/larrybuildsai/gatecheck
  • Glama: https://glama.ai/mcp/connectors/io.github.LarryLemonBot/gatecheck
  • mcpservers.org: https://mcpservers.org/servers/x402-resource-scanner-vercel-app-gatecheck-marketplaces

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Install directly

claude mcp add --transport http gatecheck https://proofbeforepay.vercel.app/gatecheck/mcp
Add to Cursor

GateCheck by LarryBuildsAI: common questions

Is GateCheck by LarryBuildsAI MCP server safe?
Mostly: it is graded B (81/100). Read the GateCheck by LarryBuildsAI safety report
How do I install GateCheck by LarryBuildsAI?
It runs remotely at proofbeforepay.vercel.app. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does GateCheck by LarryBuildsAI need an API key?
Yes. The registry entry asks for Authorization.
Is GateCheck by LarryBuildsAI maintained?
The last commit was 75 days ago (2026-07-14). The latest release is v0.1.3.
Is GateCheck by LarryBuildsAI up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.

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