# GateCheck by LarryBuildsAI

Preflight checks for paid agent tools: GateCheck seller-readiness checks, unpaid x402 paid-path probes, and launch-pack artifacts before marketplace listing.

## Connect

- Transport: Streamable HTTP MCP JSON-RPC
- URL: `https://x402-resource-scanner.vercel.app/gatecheck/mcp`
- Category: `Agent Verification & Security`
- Docs: `https://x402-resource-scanner.vercel.app/llms.txt`
- OpenAPI: `https://x402-resource-scanner.vercel.app/openapi.json`
- Provider: `LarryBuildsAI`
- Product name: `GateCheck`
- Tagline: `Preflight checks for paid agent tools.`
- Aliases: `Agent Tool Readiness Checker`, `x402 Resource Scanner`, `Boundary Guard x402`
- Legacy name: `Boundary Guard x402` for the receipt layer and xpay slug; use `GateCheck by LarryBuildsAI` for CDP / Agentic.Market buyer discovery.

## When to use

Use this MCP server when an AI agent, marketplace, or developer workflow needs:

1. A low-cost pre-action trust checkpoint before writes/sends/paid calls.
2. A deterministic receipt with evidence hashes and an explicit claim boundary.
3. A read-only x402/OpenAPI/resource readiness scan before listing or integrating an endpoint.
4. Marketplace-safe x402 launch copy, buyer FAQs, launch checklists, and approval packets.
5. A conservative unpaid paid-path health probe that verifies HTTP 402/payment metadata without signing or spending.
6. Marketplace listing evidence for x402/MCP directories and agent catalogs.
7. Virtuals ACP Provider or Hybrid agent listing copy, job schemas, resource URL definitions, and launch checks.

## What GateCheck is — and is not

GateCheck by LarryBuildsAI is the seller-side preflight evidence layer for paid x402 and MCP tool sellers. Use GateCheck before public submission, promotion, or paid agent routing so buyers and agents can inspect public metadata, unpaid 402 challenge shape, discovery files, pricing/resource metadata, and claim boundaries.

Do not use it as marketplace approval, wallet automation, escrow, security certification, or a deep task-completion benchmark. It is designed to make the paid route legible before spend, not to guarantee marketplace ranking, settlement, vulnerability posture, or downstream execution.

## Tools

### `boundary_guard_check`

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.

Suggested xpay price: `$0.03`.

### `scan_x402_resource`

x402 Resource Scan: 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.

Suggested xpay price: `$0.10`.

### `probe_x402_paid_path`

x402 Paid-Path Health Probe: 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.

Suggested xpay price: `$0.50`.

### `check_agent_tool_readiness`

GateCheck 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 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.

Suggested xpay price: `$1.00`.

### `generate_x402_launch_pack`

x402 Launch Pack Generator: 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.

Suggested xpay price: `$9.00`.

### `generate_trust_receipt`

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 documents, or payer-identifying evidence.

Suggested xpay price: `$0.05`.

## Safety

- Public metadata only by default.
- No private endpoint probing beyond declared manifests/docs.
- No private keys, cookies, wallets, or customer data stored in the service.
- Claim boundary: readiness reports and receipts prove what this service observed, received, hashed, and returned; they do not prove marketplace endorsement, settlement, security certification, or downstream real-world execution.