# Boundary Guard x402
> Boundary Guard x402 provides paid MCP and REST tools for x402 seller readiness, unpaid 402 paid-path checks, launch-pack generation, and deterministic trust receipts for agent workflows.

## Portal
https://boundary-guard-x402.on.xpay.sh

## MCP Servers

### GateCheck by LarryBuildsAI
GateCheck by LarryBuildsAI: paid MCP/REST preflight for x402 sellers. Checks public metadata, unpaid 402 challenges, agent-readiness, launch packs, and deterministic receipts with explicit claim boundaries.
URL: https://boundary-guard-x402.mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY
Tools:
- boundary_guard_check: Create a Boundary Guard pre-action checkpoint receipt for an agent request, policy decision, and result summary. ($0.03/call)
- scan_x402_resource: Read-only scan of public x402/OpenAPI metadata and optional marketplace listing staleness. ($0.10/call)
- probe_x402_paid_path: Probe a public x402 endpoint without payment, parse the 402 challenge, compare expected network/asset/price, and return a deterministic health receipt. ($0.50/call)
- check_agent_tool_readiness: Check whether an x402/agent-facing tool is ready for agent routing, marketplace listing, and paid-path monitoring, including public discovery surfaces (/llms.txt, /agents.txt, /.well-known/mcp.json, /mcp). ($1.00/call)
- generate_x402_launch_pack: Generate marketplace-safe listing copy, buyer FAQ, launch checklist, approval packet, and claim boundaries for x402/MCP sellers from readiness evidence. ($9.00/call)
- generate_trust_receipt: Generate a deterministic trust receipt from arbitrary request/policy/result/payment evidence. ($0.05/call)

### Signal Desk by LarryBuildsAI
Signal Desk by LarryBuildsAI is a market-aware paid decision layer before bigger agent spend. Agents use it to decide what to buy next, what to skip, and when to stop spending across search, enrichment, model, finance, and onchain-data workflows.
URL: https://signal-desk-larrybuildsai.mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY
Tools:
- quote_agent_route: Estimate the cheapest sensible agent execution lane before buying model calls or xpay tools. Returns a budget decision, tool-stack recommendation, and fallback plan. ($0.03/call)
- generate_public_lead_brief: Fetch a public website and return a buyer-fit brief with public signals, agentic offer angles, and next actions. No private contact database is queried. ($0.03/call)
- score_defi_token_risk: Return a research-only token risk snapshot from public liquidity, volume, pair-age, volatility, and data availability. Does not trade and is not financial advice. ($0.01/call)
- compare_market_tool_options: Compare a task against public xpay catalog options and observed high-demand tool patterns before an agent chains several paid tools. Returns competing tool surfaces, Signal Desk countermoves, moat guidance, unsupported claims, and recommended next paid calls. ($0.03/call)

### ResultRail by LarryBuildsAI
ResultRail by LarryBuildsAI sells pay-per-success public-data result packs for AI agents. Agents get source URLs, confidence, timestamps, and receipt hashes without another vendor account.
URL: https://resultrail-larrybuildsai.mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY
Tools:
- quote_data_result: Free pre-payment quote for one ResultRail public-data result. Returns price, paid endpoint, success contract, and whether the buyer's max price covers the result. ($0.00/call)
- enrich_domain_result: Fetch a public domain/homepage and return one source-attributed result pack: company/title/description, industry guess, technographic signals, useful paths, confidence, sources, and receipt hash. ($0.12/call)
- extract_url_result: Fetch one public URL and return title, description, headings, text preview, links, confidence, source URL, and receipt hash. Designed for pay-per-success agent extraction. ($0.05/call)

## Get Started
1. Get an API key at https://boundary-guard-x402.on.xpay.sh/account/keys
2. Add the MCP server URL to your client config (Claude, Cursor, Windsurf)
3. Pay per tool call from your XPay wallet

## About
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