LimitGuard Trust Intelligence

LimitGuard MCP Server

Trust Intelligence for AI agents. Entity verification, sanctions screening, and risk scoring via the Model Context Protocol.

Server URL: https://api.limitguard.ai/mcp Transport: Streamable HTTP (POST) Auth: API key (Bearer), plus an x402 micropayment per call on the free and sandbox tiers

Start here: Free sandbox key, no wallet. $0.65-0.85 fresh; $0.10 cached when available.

Tools

tools/list is public — connect and read it without any credential. These are the names it returns, and the names tools/call accepts:

Pricing

All tools are priced via x402 micropayments (USDC on Base or Solana):

Authentication

Two things gate a tools/call, in this order:

1. An API key, as Authorization: Bearer <key>. Without one every call comes back Authentication required. Provide API key via Authorization: Bearer <lg_live_...> header. Get a free one — no payment, no card:

   curl -X POST https://api.limitguard.ai/v1/keys/create \
     -H "Content-Type: application/json" \
     -d '{"email": "you@example.com"}'
   

   That returns a free-tier key, which is the key the Quick Start configs below expect. Asking for "tier": "sandbox" instead returns a key that answers with mock data — see the next point before you use one here.

2. Payment, on the free and sandbox tiers only. Send the x402 proof as PAYMENT-SIGNATURE (x402 v2) or X-PAYMENT (v1), alongside the Bearer key. A paid subscription (indie and up) covers usage and needs no per-call payment.

   A sandbox key does not lift the payment requirement on this transport: it owes x402 per call exactly as a free key does, and it answers with mock data rather than a real check. Paying for one over MCP spends real USDC on a mock answer. Where a sandbox key is worth having is the REST mirrors under /v1/mcp/* (sent as X-API-Key, not Bearer), which serve the mock response before the payment check — a way to exercise the request and response shapes, not a cheap source of real checks.

Full x402 API (direct HTTP)

The 5 tools above are what the MCP server exposes over the Model Context Protocol. Clients that integrate directly over HTTP — instead of through an MCP client — can reach 18 x402-priced endpoints on https://api.limitguard.ai: the 13 REST endpoints below, plus the MCP tools' own /v1/mcp/* paths. All 18 are published in /.well-known/x402.json; only the 5 tools above are listed by /.well-known/mcp.json.

Most of the REST endpoints are capabilities the MCP tools do not expose, but two are the same check reached over plain HTTP: /v1/entity/check behind check_entity — the manifest describes /v1/mcp/check-entity as "same as /v1/entity/check with MCP-native interface" — and /v1/risk/score behind get_risk_score, at the same $0.65.

Payment works the same way throughout: USDC on Base or Solana, pay-per-call. The 9 data endpoints below need no API key at all. The 4 /v1/keys/upgrade/* endpoints also take payment without one, but they act on an API key you already hold — see API key tiers.

Trust intelligence

Reputation management

Wallet services

Regulatory compliance

MCP tool paths (direct HTTP)

The 5 MCP tools are also reachable over plain HTTP at their own x402-priced paths — same capabilities and prices as the Tools table above, for clients that pay per call without opening an MCP session.

API key tiers

LimitGuard accepts two forms of payment: x402 per call, or a paid-tier API key whose subscription prepays the calls. Paying per call needs no API key on 13 of the 18 endpoints — the 9 data endpoints above and the 4 /v1/keys/upgrade/* paths. The other 5 always want a key: the MCP transport takes Authorization: Bearer on every tools/call, and its /v1/mcp/* mirrors take X-API-Key.

A base key is free and self-service: POST /v1/keys/create with an email address, no payment and no existing key needed. It identifies you and tracks your usage; it does not pay for calls. A free-tier key still owes x402 on every paid endpoint, on REST exactly as on MCP. The monthly_limit it reports is a ceiling on how many calls it may make, not an allowance of free ones. A sandbox key is also free and returns mock data, never a real check — over MCP it owes x402 like any other free key, so it earns its keep only against the REST mirrors.

The endpoints below take an x402 payment to move a key onto a paid tier, which is what lifts the per-call charge. On a paid tier monthly_limit is the number of calls the subscription covers. The manifest prices the upgrade call itself and says nothing about what happens at the end of a month, so confirm the renewal terms before budgeting against the figures below.

Prices and descriptions above mirror the live x402 manifest as of 2026-09-05. The manifest is the source of truth — fetch it if you need the current schema for any endpoint.

Quick Start

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "limitguard": {
      "type": "url",
      "url": "https://api.limitguard.ai/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_LIMITGUARD_KEY"
      }
    }
  }
}

Cursor

Add to MCP settings:

{
  "limitguard": {
    "type": "url",
    "url": "https://api.limitguard.ai/mcp",
    "headers": {
      "Authorization": "Bearer YOUR_LIMITGUARD_KEY"
    }
  }
}

Smithery

npx -y @smithery/cli install @limitguard/trust-intelligence

Any MCP Client

Connect to https://api.limitguard.ai/mcp using Streamable HTTP transport (POST), sending Authorization: Bearer <key> on every tools/call.

Discovery Endpoints

The service publishes two tool cards, and they do not agree. Both list the same five tools, taking the same required arguments, so a tools/call written against either one works — but the descriptions and the argument wording differ between them. The Tools table above and this repository's server.json are generated from the server card, which is the one to read when the two disagree. Reconciling them is the service's to fix.

Use Cases

• KYC/KYB Automation — AI agents verify business entities before transactions
• Sanctions Screening — Check entities against OpenSanctions watchlists
• Agent-to-Agent Trust — Verify counterparty agent reputation before collaboration
• Wallet Verification — Check blockchain wallet risk before on-chain transactions
• Due Diligence — Automated entity research with trust scoring

Security

• HTTPS with TLS 1.3
• x402 payment protocol for per-call billing (no stored payment credentials)
• GDPR-compliant (EU-hosted, data minimization)
• All tools are read-only (no data modification)
• Rate limited per payment (abuse-proof)

Links

• Website: limitguard.ai
• Status: status.limitguard.ai
• MCP Registry: ai.limitguard.api/trust-intelligence (JSON; the registry has no HTML page per server)

License

MIT