# 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.

MCP endpoint: https://x402-resource-scanner.vercel.app/gatecheck/mcp
Legacy MCP endpoint: https://x402-resource-scanner.vercel.app/mcp
Category: Agent Verification & Security
Docs: https://x402-resource-scanner.vercel.app/llms.txt
OpenAPI: https://x402-resource-scanner.vercel.app/openapi.json
Product card: https://x402-resource-scanner.vercel.app/product-card.md
x402 manifest: https://x402-resource-scanner.vercel.app/.well-known/x402
Glama ownership: https://x402-resource-scanner.vercel.app/.well-known/glama.json
Aliases: Agent Tool Readiness Checker; x402 Resource Scanner; Boundary Guard x402. Legacy receipt layer / xpay slug: Boundary Guard x402. Use GateCheck by LarryBuildsAI for public buyer discovery.
Marketplace prep path: prepare CDP Bazaar / Agentic.Market evidence; actual marketplace indexing still requires the marketplace's own flow and confirmation.
Virtuals ACP prep path: prepare Provider or Hybrid agent job-offering resources that point at these public endpoints; actual listing still requires the platform's own flow.

Tools:
- 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. ($0.03)
- 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 called. ($0.10)
- 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. ($0.50)
- 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 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. ($1.00)
- 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; service/premium tiers include readiness evidence. Tiers: single $9, service $29, premium $49. ($9.00)
- 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. ($0.05)

Positioning:
- GateCheck is the seller-side preflight evidence layer for paid x402 and MCP tool sellers before a seller submits, promotes, or routes agents into a paid 402 flow.
- Not a marketplace, wallet, security audit, escrow, endorsement, or deep benchmark lab.

Buyer outcomes:
- Reduce accidental paid-tool or write-action risk with a low-cost pre-action checkpoint.
- Attach deterministic evidence hashes to agent workflow logs and support tickets.
- Find x402 listing gaps before submitting to marketplaces or charging agents.
- Give buyers a clear LarryBuildsAI readiness-check entry point instead of stale legacy Boundary Guard routes.
- Prepare marketplace evidence with clear resource URLs, schemas, examples, and paid-route metadata.
- Prepare Virtuals ACP provider-agent listings with business description, job-offering copy, resource URLs, schemas, and SLA/pricing guidance.
- Generate marketplace-safe x402 launch copy, buyer FAQs, checklist items, and approval packets.
- Probe paid endpoints for healthy unpaid 402/payment metadata without signing or spending.

Use when an agent needs a low-cost pre-action trust checkpoint, a deterministic receipt, an unpaid x402 paid-path health probe, a launch pack, or a read-only x402/OpenAPI readiness scan before marketplace listing or paid tool calls.
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.