GateCheck by LarryBuildsAI
About
Preflight checks for paid x402 and MCP tools before marketplace listing.
Details
- Author
- larrylemonbot
- Categories
- Developer Tools, Other, Automation
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Setup
Install GateCheck by LarryBuildsAI in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/larrylemonbot/gatecheck
Follow the installation instructions in the repository README, then restart your MCP client.
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.
- Remote MCP URL:https://proofbeforepay.vercel.app/gatecheck/mcp
- Transport:streamable-http
- Public introspection:initializeandtools/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
{ "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" }
GateCheck currently exposes six MCP tools:
- boundary_guard_check
- scan_x402_resource
- probe_x402_paid_path
- check_agent_tool_readiness
- generate_x402_launch_pack
- generate_trust_receipt
Publictools/listis available so buyers, agents, and directories can inspect the tool inventory before protected calls.
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 Generated launch packs contain listing and approval-review artifacts; they do not publish listings, contact buyers, or claim marketplace endorsement.
- 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: unpaid402challenge metadata without submitting payment signatures or moving funds.
- Listing readiness: buyer-facing copy, prices, evidence links, launch-pack artifacts, and claim boundaries.
GateCheck reports and receipts prove observed public metadata, unpaid402behavior, 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.
GateCheck is separate from Signal Desk and ResultRail.
This repository is the public distribution and marketplace-submission surface for GateCheck only.
- 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
Known external blockers: the former MCP.so listing URL currently returns404, andhttps://xpay.tools/agents.txthas not exposedgatecheck. Neither surface is claimed as live.
- Cline submission draft:marketplaces/cline-submission.md
- MCP.Directory submission draft:marketplaces/mcp-directory-submission.md
- Server manifest:server.json
- Public scorecard:scorecard.md
- Logo SVG:assets/gatecheck-logo.svg
- Logo PNG:assets/gatecheck-logo.png
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