Point Cursor at OTPBox's remote MCP server and it can create test inboxes and read real verification emails without leaving the editor.
Mint a free key first (no account, no card):
curl -X POST https://otpbox.io/api/v1/keys/free -H "content-type: application/json" -d '{}'
→ { "id": "lic_...", "key": "...", "plan": "free", "quotaLimit": 200 }
Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):
{
"mcpServers": {
"otpbox": {
"url": "https://otpbox.io/mcp",
"headers": { "Authorization": "Bearer <your-otpbox-key>" }
}
}
}
${env:VAR} references inside headers, so you can keep the raw key out of the file: "Authorization": "Bearer ${env:OTPBOX_KEY}".Once connected, Cursor can call OTPBox's 13 MCP tools directly. For example:
"Use otpbox to create a test inbox, register a new account on this app with that address, then get the OTP and complete verification."
Every code and link comes from a real delivered email, not a stub - so the test proves the actual signup flow works.
OTP codes and verification links are parsed out automatically. No regex against raw email bodies.
200 requests/month with a key minted in one call - no account, no payment info, no waiting.
create_test_inbox, wait_for_email, get_otp, get_verification_link, create_test_identity, and more - the full loop is agent-callable.
For Cursor's own MCP setup UI/flags beyond the snippet above, see Cursor's MCP documentation.