iFlow CLI (a Chinese terminal agent aggregating several model backends) installs MCP servers with a single add-json command - OTPBox works the same way as any other streamable-HTTP server.
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 }
Install with the iFlow CLI:
iflow mcp add-json --scope user 'otpbox' '{"httpUrl":"https://otpbox.io/mcp","headers":{"Authorization":"Bearer <your-otpbox-key>"}}'
--scope user makes it available across every project; drop it to add the server to the current project only.Once connected, iFlow CLI can call OTPBox's 13 MCP tools directly. For example:
"Use otpbox to create a disposable inbox, sign up for this app, and get me the code from the verification email."
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 iFlow CLI's own MCP setup UI/flags beyond the snippet above, see iFlow CLI's MCP documentation.