GateCheck by LarryBuildsAI is a remote MCP server that gives an AI agent 6 tools, among them boundary_guard_check, check_agent_tool_readiness, generate_trust_receipt. It answers at https://proofbeforepay.vercel.app/gatecheck/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 11 September 2026; the last check, on 20 October 2026, succeeded.
One-cent x402 and MCP readiness checks plus fixed-price marketplace launch packs.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
boundary_guard_check | 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. Inputs: nextStep, policy, request, result |
check_agent_tool_readiness | 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 ta Inputs: expected, expected_resources, marketplace_url, method, paid_path, target |
generate_trust_receipt | 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 documen Inputs: nextStep, payment, policy, request, result |
generate_x402_launch_pack | 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; s Inputs: audience, desired_marketplaces, expected, expected_resources, marketplace_url, method |
probe_x402_paid_path | 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. Inputs: expected, method, mode, target |
scan_x402_resource | 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 ca Inputs: expected_resources, marketplace_url, url |
Every block below points at https://proofbeforepay.vercel.app/gatecheck/mcp. Pick your client and copy.
claude mcp add --transport http gatecheck-by-larrybuildsai https://proofbeforepay.vercel.app/gatecheck/mcp
{
"mcpServers": {
"gatecheck-by-larrybuildsai": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://proofbeforepay.vercel.app/gatecheck/mcp"]
}
}
}{
"mcpServers": {
"gatecheck-by-larrybuildsai": {
"url": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}{
"servers": {
"gatecheck-by-larrybuildsai": {
"type": "http",
"url": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}{
"context_servers": {
"gatecheck-by-larrybuildsai": {
"url": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}{
"mcpServers": {
"gatecheck-by-larrybuildsai": {
"serverUrl": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}{
"mcpServers": {
"gatecheck-by-larrybuildsai": {
"url": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}name: GateCheck by LarryBuildsAI
version: 0.0.1
schema: v1
mcpServers:
- name: GateCheck by LarryBuildsAI
type: streamable-http
url: https://proofbeforepay.vercel.app/gatecheck/mcp{
"mcpServers": {
"gatecheck-by-larrybuildsai": {
"httpUrl": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}{
"mcpServers": {
"gatecheck-by-larrybuildsai": {
"type": "http",
"url": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}{
"mcpServers": {
"gatecheck-by-larrybuildsai": {
"url": "https://proofbeforepay.vercel.app/gatecheck/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fproofbeforepay.vercel.app%2Fgatecheck%2Fmcp&type=streamable_http&id=gatecheck-by-larrybuildsai&name=GateCheck%20by%20LarryBuildsAI
It answered our last check on 20 October 2026 in 194 ms. Over 6 checks since 11 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
6, as returned by the server's own tools/list on 12 September 2026: boundary_guard_check, check_agent_tool_readiness, generate_trust_receipt, generate_x402_launch_pack, probe_x402_paid_path, scan_x402_resource.
It answered our last check on 20 October 2026 in 194 ms. Over 6 checks since 11 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://proofbeforepay.vercel.app/gatecheck/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.larrylemonbot. Endpoint host: proofbeforepay.vercel.app. ARD identifier: urn:air:io.github.larrylemonbot:mcp:gatecheck.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.