GateCheck MCP Server: io.github.LarryLemonBot/gatecheck

GateCheck is a hosted remote MCP server and an x402 readiness surface for paid agent-tool sellers. It provides one-cent x402 checks and MCP readiness verification before public submission, promotion, or paid agent routing, focused on discoverability, inspectability, and claim-bounded behavior.

🛠️ Key Features

Hosted remote MCP endpoint: https://proofbeforepay.vercel.app/gatecheck/mcp
Transport: streamable-http
Public introspection via initialize and tools/list
Protected tool execution: bearer auth may be required for direct production calls
Includes “one-cent x402 readiness checks” and “fixed-price marketplace launch packs”
Server identity: io.github.LarryLemonBot/gatecheck (toolCount: 6)

🚀 Use Cases

Verify a paid x402 or MCP tool is discoverable and inspectable
Confirm claim-bounded readiness before public submission or promotion
Gate paid agent routing using readiness checks
Validate marketplace launch pack readiness

⚡ Developer Benefits

Supports MCP introspection (initialize, tools/list) for pre-submission verification
Uses a remote, streamable-http transport endpoint for hosted checks

⚠️ Limitations

Tool execution may require bearer authentication for direct production calls
Verification is framed around readiness (discoverable/inspectable/claim-bounded), not full authorization workflows

🔎 Related Topics

ai-agents, mcp, payments, readiness, x402

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

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:

json

{
  "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:

boundary_guard_check
scan_x402_resource
probe_x402_paid_path
check_agent_tool_readiness
generate_x402_launch_pack
generate_trust_receipt

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:

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

Known external blockers: the former MCP.so listing URL currently returns 404, and https://xpay.tools/agents.txt has not exposed gatecheck. Neither surface is claimed as live.

Marketplace Packet

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

nextStep	string	optional	Optional guidance stored in the receipt.
policy	object	optional	Decision object, e.g. allow/retry/review/block and reason.
request	object	required	Action metadata the agent is about to perform.
result	object	optional	Optional result or dry-run summary to hash into evidence.

expected_resources	integer	optional	Optional expected resource count.
marketplace_url	string	optional	Optional marketplace/listing URL to compare against public metadata.
url	string	required	Target API/provider base URL to scan.

expected	object	optional	Optional expected x402 metadata such as network, asset, and priceUsd.
method	string	optional	Safe unpaid probe method. Defaults to GET.
mode	string	optional	Probe mode for v1. Defaults to unpaid_402.
target	string	required	Specific paid endpoint URL to probe without payment.

expected	object	optional	Optional expected x402 network/asset/price metadata for paid_path probes.
expected_resources	integer	optional	Optional expected resource count.
marketplace_url	string	optional	Optional marketplace/listing URL to compare against public metadata.
method	string	optional	Safe unpaid probe method when paid_path is supplied. Defaults to GET.
paid_path	string	optional	Optional specific paid endpoint to probe without payment for deep/report tiers.
target	string	required	Target API/provider base URL to scan.
tier	string	optional	Readiness depth. quick=$1, deep=$5, report=$10. Defaults to quick.

audience	string	optional	Primary buyer/audience for listing copy.
desired_marketplaces	array	optional	Optional marketplace names to include in launch planning.
expected	object	optional	Optional expected x402 network/asset/price metadata for paid_path probes.
expected_resources	integer	optional	Optional expected resource count.
marketplace_url	string	optional	Optional marketplace/listing URL to compare against public metadata.
method	string	optional	Safe unpaid probe method when paid_path is supplied. Defaults to GET.
paid_path	string	optional	Optional paid endpoint to validate via unpaid 402 challenge for service/premium packs.
primary_use_case	string	optional	Primary buyer outcome/use case.
product_name	string	optional	Buyer-facing product title.
target	string	required	Target API/provider base URL to package for launch.
tier	string	optional	Launch pack depth. single=$9, service=$29, premium=$49. Defaults to single.

GateCheck by LarryBuildsAI

GateCheck MCP Server: io.github.LarryLemonBot/gatecheck

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

🔎 Related Topics

Topics

boundary_guard_check

scan_x402_resource

probe_x402_paid_path

check_agent_tool_readiness

generate_x402_launch_pack

generate_trust_receipt

GateCheck by LarryBuildsAI

Hosted MCP Endpoint

MCP Client Config

Tools

Buy through PayanAgent

What GateCheck Checks

Claim Boundary

Product Boundary

Current Public Visibility

Marketplace Packet

Install

Remote endpoint

Related servers

nextStep	string	optional	Optional receipt next-step guidance.
payment	object	optional	Optional sanitized payment summary or caller-provided hashes only; do not include raw payment signatures, raw payment response headers, private keys, API keys, cookies, payer-identifying evidence, or wallet secrets.
policy	object	optional	Sanitized policy or decision summary to hash.
request	object	required	Sanitized request/action summary to hash; omit raw prompts, documents, credentials, cookies, auth headers, signatures, and secrets.
result	object	optional	Sanitized outcome/result summary to hash; omit customer data and secret-like values.