🎯 Activation Test - Try This First

One prompt proves your MCP connection works

PASTE THIS EXACT PROMPT: "Use check_endpoint with url set to https://example.com" - works instantly, no signup required. This is your activation signal before paid verification tools.

🚀 Activate Now (60 seconds) MCP Setup Guide

✅ Zero signup/API key ✅ Copy-paste activation ✅ Proves MCP connection

🎯 Activation Test: 60-Second Copy-Paste Path

This is your activation signal - if this works, your MCP connection is perfect and you can explore paid tools. If this fails, your MCP client needs troubleshooting first.

1. Add the remote MCP server

Use this no-key configuration for the free first call.

{
  "mcpServers": {
    "ground-truth": {
      "url": "https://ground-truth-mcp.anishdasmail.workers.dev/mcp"
    }
  }
}

🚀 2. PASTE THIS EXACT ACTIVATION PROMPT

This is your activation test - copy and paste exactly. Success = your MCP works!

🎯 ACTIVATION TEST: Use check_endpoint with url set to https://example.com. Do NOT answer from memory - call the actual tool. Return: url, accessible, status, contentType, responseTimeMs.

Example input

The client should call this tool with this argument.

{
  "name": "check_endpoint",
  "arguments": {
    "url": "https://example.com"
  }
}

Example output shape

Response time varies by run.

{
  "url": "https://example.com/",
  "accessible": true,
  "status": 200,
  "contentType": "text/html",
  "responseTimeMs": 120
}

What Ground Truth verifies

Ground Truth helps agents check the facts that are most expensive to get wrong in buying, support, research, and product workflows.

Verify a pricing claim

Pull the live pricing page before your agent quotes a number like "Notion costs $8 per user per month."

check_pricing

Compare vendor pricing pages

Scan multiple pricing pages side by side before your agent claims one vendor is cheaper or has a better free tier.

compare_pricing_pages

Assess compliance posture

Check trust and security pages for SOC 2, ISO 27001, GDPR, HIPAA, SSO, SCIM, and DPA signals before repeating them.

assess_compliance_posture

Inspect security headers

Check public endpoints for HSTS, CSP, frame protections, and related browser-facing security headers.

inspect_security_headers

Validate an API endpoint

Confirm the URL exists, responds, and looks real before recommending it to a user or team.

check_endpoint

Check whether a competitor exists

Search npm or PyPI before your agent says there is no alternative in a category.

estimate_market

Why AI agents need verification

Training data does not tell you what changed this week. Ground Truth gives agents a last-mile check before they answer, recommend, or act.

Pricing changes quietly

Agents often repeat old prices long after a plan page changed. Live verification catches that drift.

Compliance claims get copied without proof

SOC 2, HIPAA, and GDPR claims often get repeated from memory. Ground Truth checks the live public page first.

Security posture is easy to overstate

Header-level and trust-page checks help agents ground basic security claims before they reach a buyer or customer.

Competitive claims get invented

Agents say "no competitors" or "most popular" without checking the current market. Registry data gives them a way to prove it.

Example workflows

Use Ground Truth when an answer should be checked before it leaves the model.

Pricing claim

Before an agent says "Stripe has a free tier," it checks the live pricing page and returns what it found.

Competitor existence

Before an agent says there is no alternative to Prisma for edge deployments, it searches the registry for real packages.

Compliance diligence

Before an agent says a vendor is SOC 2 and GDPR-ready, it scans the public trust page for the right signals.

Security posture check

Before an agent says an app has a solid browser-facing baseline, it checks the live response headers.

Pricing comparison

Before an agent says one vendor is cheaper, it compares multiple pricing pages side by side.

API validation

Before an agent recommends an endpoint in docs or support, it confirms the endpoint responds.

Free checks, monitored evidence, and team usage

Use the free endpoint and security-header checks to prove the connection. Pay when you need saved monitors, scheduled checks, evidence history, reports, or predictable API-key usage.

Free

Endpoint checks

Free tier includes limited monthly endpoint and security-header checks.

check_endpoint
inspect_security_headers
100 requests per calendar month
No API key required for free checks

Agentic

Pay per tool call

From $0.01/call

Useful for autonomous agents, MCP clients with x402, or an xpay proxy before you need persistent monitor history.

Per-tool USDC pricing
No monthly commitment
Works well for variable workloads
Includes pricing, compliance, security, market, and hypothesis tools

Team

Team monitor plan

$9/month

Best for internal teams that want saved monitors, change reports, predictable spend, shared access, and a familiar API-key workflow.

Requires X-API-Key
5,000 requests per calendar month by default
Usage tracked per API key and tool
Includes all paid verification tools
Saved monitors and generated change reports

See All Pricing Try The Free Check

API examples

Use Ground Truth directly over HTTP if you want the free first check in a script, backend, or agent loop.

Direct API `curl` call

Initialize the MCP session, then call the free endpoint check with no API key.

SESSION_ID="$(curl -i -s -X POST https://ground-truth-mcp.anishdasmail.workers.dev/mcp \
  -H "Accept: application/json, text/event-stream" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"ground-truth-example","version":"1.0.0"}},"id":0}' | tr -d '\r' | awk '/^mcp-session-id:/ {print $2}')"

curl -X POST https://ground-truth-mcp.anishdasmail.workers.dev/mcp \
  -H "Accept: application/json, text/event-stream" \
  -H "Content-Type: application/json" \
  -H "Mcp-Session-Id: $SESSION_ID" \
  -d '{
    "jsonrpc": "2.0",
    "method": "tools/call",
    "params": {
      "name": "check_endpoint",
      "arguments": {
        "url": "https://example.com"
      }
    },
    "id": 1
  }'

JavaScript `fetch` example

Run the same no-key endpoint check from code.

const initResponse = await fetch("https://ground-truth-mcp.anishdasmail.workers.dev/mcp", {
  method: "POST",
  headers: {
    "Accept": "application/json, text/event-stream",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    jsonrpc: "2.0",
    method: "initialize",
    params: {
      protocolVersion: "2025-03-26",
      capabilities: {},
      clientInfo: {
        name: "ground-truth-example",
        version: "1.0.0",
      },
    },
    id: 0,
  }),
});

const sessionId = initResponse.headers.get("mcp-session-id");

if (!sessionId) {
  throw new Error("Missing mcp-session-id from initialize response");
}

const response = await fetch("https://ground-truth-mcp.anishdasmail.workers.dev/mcp", {
  method: "POST",
  headers: {
    "Accept": "application/json, text/event-stream",
    "Content-Type": "application/json",
    "Mcp-Session-Id": sessionId,
  },
  body: JSON.stringify({
    jsonrpc: "2.0",
    method: "tools/call",
    params: {
      name: "check_endpoint",
      arguments: {
        url: "https://example.com",
      },
    },
    id: 1,
  }),
});

const result = await response.json();
console.log(result);

MCP setup

MCP stands for Model Context Protocol. Ground Truth works as a direct MCP server for team API-key access, and its paid tools also advertise x402 pricing metadata for agentic pay-per-use or an xpay proxy flow.

Claude Desktop

Add Ground Truth to ~/Library/Application Support/Claude/claude_desktop_config.json. No key is needed for the free first call.

{
  "mcpServers": {
    "ground-truth": {
      "url": "https://ground-truth-mcp.anishdasmail.workers.dev/mcp"
    }
  }
}

Cursor

Add Ground Truth to .cursor/mcp.json in your project or ~/.cursor/mcp.json globally. Add X-API-Key only for team-plan paid tools.

{
  "mcpServers": {
    "ground-truth": {
      "url": "https://ground-truth-mcp.anishdasmail.workers.dev/mcp"
    }
  }
}

If you want turnkey pay-per-tool billing for clients that do not natively handle x402 yet, register this server URL with xpay and share the resulting proxy URL instead.

Use cases

Ground Truth fits anywhere an AI agent needs a final check before sharing an answer or taking action.

Support

Verify pricing claims, confirm support entitlements, and check whether an API endpoint a customer asks about actually exists.

Product

Test market assumptions, check whether a competitor exists, and compare live pricing pages before you lock in a direction.

Compliance

Scan trust pages for SOC 2, ISO 27001, HIPAA, GDPR, DPA, SSO, and SCIM signals before repeating them to buyers or internal stakeholders.

Security & vendor diligence

Inspect public security headers, verify claims against public evidence, and add lightweight diligence before an agent recommends or approves a vendor.