Install, pair, send a signal

Meridian is a NinjaTrader 8 AddOn — a DLL in a folder, plus one file you can read. There is no installer, no service and no server to rent.

1. Close NinjaTrader. A loaded AddOn's assembly is locked, so copying over it while NT is open fails halfway.
2. Copy the DLL into your NinjaTrader custom AddOns folder: Documents\NinjaTrader Data\NinjaTrader\bin\Custom\AddOns\ (the path is printed by Settings → General → NinjaTrader Data if yours differs).
3. Start NinjaTracker and wait for it to finish loading, then open the window from the AddOns menu. It shows as Meridian Signal Desk.

The window appearing is the whole install. You can close and reopen it freely — settings live in a JSON file next to the DLL, not in NinjaTrader's own configuration.

Nothing to compile and no SDK required: the DLL you copy is already built. If the window never appears, the file is in the wrong folder — check you used Custom\AddOns\ and not a parent directory, and confirm you extracted the archive rather than opening it inside it.

The copier runs on the PC that holds the accounts, so that PC has to prove which dashboard account it belongs to. In the AddOn window, find the Sign in & pair row and enter your dashboard user id and password.

That writes a small LinkConfig.json next to the DLL and the PC connects on its own — over an outbound secure websocket, so you do not open any inbound port on your router or Windows firewall.

One PC per account. Signing in on a second PC rotates the account's device key and signs the first one out, which is deliberate: two machines must never be able to submit orders for the same account at once.

Need to move? Sign in on the new PC. The row on the old one greys out and offers Sign out. There is nothing to reinstall.

Your endpoint is on your dashboard Profile page, and it is the only per-account address that matters:

https://www.meridiansignaldesk.com/webhook/u/<your-id>/<your-secret>

The u/<your-id> part pins every signal to your own copier, and the tail is a secret minted for your account alone, shown only to you and fixed for the account's life. A wrong secret and an unknown account are refused identically, so an address cannot be probed to discover who exists.

You also need the listener secret from the dashboard's Copier Setup → Webhook listener card. It is a second, separate value: the URL proves whose signal it is, the listener secret proves it came from something you control. Add it to every alert body as "secret": "…".

In a TradingView alert, set the webhook URL to your endpoint and put this in the message body:

{"secret":"YOUR_LISTENER_SECRET","account":"YOUR_LEADER_ACCOUNT","instrument":"MES","side":"long","qty":1,"strategy":"orb"}

The fields Meridian reads:

Not sure of the payload? The dashboard's Signal Console builds and sends one for you, with a live log of what the copier did with it — the fastest way to prove a wiring before it matters.

Before pointing this at a live account, connect a NinjaTrader sim account as a follower and leave the leader on sim too. Send one alert. Then watch the journal: you should see the webhook accepted, the leader's position read, the follower routed, and the fill recorded.

To watch behaviour without sending orders, set the follower to shadow mode. The journal records what it would have done and nothing reaches the account.

Once the journal reads the way you expect, add your real accounts one at a time. Each row has its own leader, multiplier and outage policy, so you can bring a second account up with different rules while the first is already running.