LarryBuildsAI · CDP Bazaar / Agentic.Market-ready · Agent Verification & Security

GateCheck is preflight for paid agent tools.

Find launch blockers before buyers do. Built for x402, MCP, and paid API/tool sellers who need to prove their service is discoverable, payable, and accurately described before sending buyers or submitting to marketplaces.

Enter a paid agent-tool URL. GateCheck scans public metadata, 402 payment challenge behavior, OpenAPI/MCP discovery, and launch copy, then returns a buyer-safe readiness report with claim boundaries.

Get xpay API key Run direct x402 API View sample report

No login required for samples. No keys, cookies, wallets, or customer data needed for public-metadata checks.

POST /v1/x402/agent-tools/readiness
{
  "target": "https://seller.example",
  "tier": "report",
  "checks": ["x402", "openapi", "mcp", "llms.txt"],
  "claimBoundary": "observed evidence only"
}

legacy receipt layer: Boundary Guard x402

$1–$10Readiness checks for paid agent-tool and x402 sellers.

$9–$49Launch packs with listing copy, FAQ, checklist, and approval notes.

402Probe 402 payment metadata without signing or spending.

0 secretsPublic metadata only by default; no keys, cookies, wallets, or customer data required.

GateCheck gives sellers the evidence layer before launch.

GateCheck by LarryBuildsAI gives x402 and MCP sellers a clean pre-listing evidence packet: what is live, what is missing, what buyers will see, and which claims are safe to make. Agent Tool Readiness Checker and x402 Resource Scanner remain descriptive aliases. Boundary Guard x402 remains available for legacy receipts.

PRIMARY

GateCheck Readiness

Score an x402/API/MCP service, identify launch blockers, validate discovery surfaces, and produce a claim-bounded handoff for review.

UPSELL

x402 Launch Pack Generator

Turn readiness evidence into marketplace-safe listing copy, buyer FAQ, checklist, distribution draft, and approval packet.

Pick the smallest proof step that matches your launch.

Start with a $1 quick readiness check when you need a fast public-surface pass. Use the $10 report when you need a handoff artifact. Package the launch only after the evidence is clean enough to sell from.

1$1 quick readiness checkScan x402 manifest, OpenAPI, pricing metadata, llms.txt, agents.txt, MCP discovery, and optional marketplace URL for obvious launch blockers.

2$10 buyer-safe reportAdd a claim-bounded Markdown handoff with score breakdown, findings, fixes, and re-test guidance a seller can share before marketplace review.

3$49 premium launch packGenerate buyer-safe listing copy, FAQ, checklist, distribution draft, pricing guidance, approval notes, and claim boundaries without posting or spending.

Get xpay API key Run direct x402 API See $10 report sample See $49 launch pack sample

What GateCheck is — and is not.

GateCheck is a 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. It is not a payment processor, wallet, security audit, or marketplace approval guarantee; it checks public launch evidence and produces a buyer-safe readiness report.

IT IS

Preflight evidence before spend

A quick way to find launch blockers and package bounded proof before a marketplace review, X launch, MCP directory submission, or paid agent routing.

IT IS NOT

No false trust claims

Not a marketplace endorsement, wallet or payment automation layer, security audit, escrow, guaranteed ranking signal, or deep benchmark lab.

1Not a marketplaceComplements Bazaar, Agentic.Market, x402scan, xpay, and MCP directories by checking seller evidence before distribution.

2Not a wallet or payment automation layerInspects unpaid challenge metadata and public docs without signing, spending, holding funds, or executing buyer purchases.

3Not a security auditKeeps claims bounded: observed public metadata and readiness evidence, not vulnerability certification or agent-spend safety guarantees. Not a deep benchmark lab for multi-turn task completion.

MCP and REST tools ready for marketplaces.

Direct REST endpoints are x402-gated. The MCP endpoint exposes read-only and receipt tools prepared for xpay wrapping and agent-directory crawlers.

x402 manifest MCP server card Sitemap

Boundary Guard Check $0.03

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.

x402 Resource Scan $0.10

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.

x402 Paid-Path Health Probe $0.50

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.

GateCheck Readiness $1.00

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.

x402 Launch Pack Generator $9.00

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.

Generate Trust Receipt $0.05

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.

MCP endpoint: https://x402-resource-scanner.vercel.app/mcp. Public docs are served from this deployment. Claim boundary: readiness reports and receipts prove what this service observed, received, hashed, and returned — not marketplace endorsement, settlement proof, security certification, or downstream real-world execution.