MT5 Expert Advisor Parameters Explained: From Legacy AlgoWay v1.84 to Current AlgoWayWS-MT5 EA 2.10

This page started as the AlgoWay MT5 v1.84 parameter reference. It now explains how the earlier inputs relate to the current AlgoWayWS-MT5 EA workflow, including the webhook UUID, position sizing, trade modes, symbol mapping, trailing stop and MetaTrader 5 execution settings.

AlgoWay has moved forward. The current MT5 automation flow is based on the AlgoWayWS-MT5 WebSocket Expert Advisor, and production setups should use the latest EA with the current AlgoWay dashboard. The v1.84 context remains here to explain which earlier parameters still matter and how to move from an older MT5 EA configuration to the current AlgoWayWS-MT5 EA 2.10 workflow.

If you are setting up AlgoWay now, do not treat this as a frozen v1.84 manual. Treat it as a current navigation and explanation page for MT5 Expert Advisor parameters, TradingView-to-MT5 webhook automation, JSON messages, trade modes, risk controls, and common MT5 errors.

Last updated: 2026-05-12 • Author: AlgoWay

Start Here: Current AlgoWayWS-MT5 EA Setup Links

For a current setup, use these guides first:

What Changed Since AlgoWay MT5 v1.84?

The old v1.84 page was a static list of EA inputs. That was useful when the product was smaller, but it is not enough for the current AlgoWay platform.

Modern AlgoWay MT5 automation should be understood as a full execution chain:

TradingView / Telegram / webhook signal -> AlgoWay platform -> AlgoWayWS-MT5 EA -> MetaTrader 5 broker account

The old parameter names still help explain the logic, but the current workflow is broader:

• the EA connects through WebSocket instead of acting as a simple static bridge;
• the AlgoWay dashboard controls the webhook route and platform destination;
• JSON messages define the signal payload;
• trade modes define how the EA reacts to opposite signals;
• risk management controls define whether a signal should be executed, modified, trailed, closed or blocked;
• MT5 logs and AlgoWay webhook logs must be checked together during troubleshooting.

What Is an MT5 Expert Advisor Parameter?

An Expert Advisor parameter is an input setting that changes how the MT5 robot behaves after it is attached to a chart. In an AlgoWay setup, these inputs do not create the trading signal. They define how the EA connects, interprets incoming webhook instructions, maps symbols, sizes positions, manages execution, and applies safety rules.

That distinction matters. A strategy can generate a good signal, but a bad EA parameter can still break execution. Wrong UUID, wrong symbol mapping, wrong lot coefficient, wrong trade mode, or wrong session filter can make a correct signal behave incorrectly.

Legacy v1.84 Parameters That Still Matter Conceptually

The exact interface can change between versions, but these concepts remain important in the current AlgoWayWS-MT5 EA workflow.

1. Webhook UUID / Connection Identifier

The old page used the field Your AlgoWay Webhook here. The current idea is the same: the EA needs to know which AlgoWay webhook route belongs to this MT5 terminal.

The UUID connects the MT5 EA to the webhook configured in your AlgoWay dashboard. Use the UUID exactly as shown in AlgoWay, without extra spaces or unrelated URL text.

b7534616-6c8c-4582-8af4-7c143d323231

Current setup guide: connect TradingView to MetaTrader 5 with AlgoWay EA.

2. Trade Mode: Hedge, Reverse and Opposite

Trade mode defines what happens when a new signal arrives while a position is already open on the same symbol.

Mode	Legacy meaning	Current practical meaning
Hedge	Allow BUY and SELL positions to exist separately	Use when the broker/account supports hedging and the strategy intentionally allows both directions
Reverse	React to an opposite signal by closing the current position	Use when an opposite signal means exit first, not instant flip
Opposite	Close the current side and open the opposite side	Use when the strategy must immediately flip from BUY to SELL or from SELL to BUY

Full explanation: Hedge, Reverse and Opposite modes in AlgoWay.

3. Lot Coefficient / Position Sizing

The old v1.84 page used a coefficient for converting incoming signal size into MT5 lot size.

final lot = incoming size × coefficient

The concept is still important: AlgoWay receives a size value from the signal source, then the MT5 side must convert that value into a broker-compatible lot size. This is one of the most sensitive settings in any MT5 automated trading setup.

Example:

incoming size = 10
coefficient = 0.001
final MT5 lot = 0.01

Always test sizing on a demo account or very small volume before live execution.

4. Symbol Mapping

TradingView tickers and broker symbols are often not identical. TradingView may send EURUSD, while the MT5 broker uses EURUSD.a. Crypto symbols can be even more different.

Incoming ticker	Broker MT5 symbol
EURUSD	EURUSD.a
BTCUSDTPERP	BTCUSDTm
XAUUSD	XAUUSD.r

If the symbol is wrong, AlgoWay can receive the signal correctly while MT5 still rejects execution. Always check the exact symbol name in MetaTrader 5 Market Watch.

5. Order Filling Type: AUTO, FOK and IOC

Order filling type controls how the broker should fill the requested order. In many cases Auto Mode is the safest starting point because brokers differ in supported filling policies.

• AUTO - lets the EA choose a supported filling method.
• FOK - Fill-or-Kill.
• IOC - Immediate-or-Cancel.

If trades fail even though the JSON is correct, filling type and broker symbol settings are among the first things to check in MT5 logs.

6. PIP Type and TradingView Pip Logic

TradingView and brokers can represent pip values differently, especially on 5-digit Forex symbols, metals, indices, and crypto CFDs. A pip conversion setting exists to prevent Stop Loss, Take Profit, and trailing calculations from being interpreted incorrectly.

If your SL/TP or trailing stop distances look wrong in MT5, check pip interpretation and symbol digits before changing your strategy.

7. Stop Loss, Take Profit and Trailing Stop

The old v1.84 page already mentioned trailing stop. Current AlgoWay automation should treat SL/TP and trailing as part of the full risk-management layer.

Typical JSON fields include:

{
  "platform_name": "metatrader5",
  "ticker": "EURUSD",
  "order_contracts": 0.10,
  "order_action": "buy",
  "sl_price": 1.0745,
  "tp_price": 1.0820,
  "trailing_pips": 15
}

Current guide: advanced risk management and trade automation.

8. Session Filters and Auto-Flat Logic

Session filters decide when the EA is allowed to execute trades. Auto-flat logic decides whether positions should be closed before a time cutoff, end of day, or end of week.

These settings are not cosmetic. They decide whether a valid signal is executed or rejected. If a signal arrives outside the allowed session, MT5 may correctly refuse the trade according to the EA configuration.

Current AlgoWayWS-MT5 Setup Checklist

Use this checklist if you are configuring the current AlgoWay MT5 automation route:

1. Create or open your MT5 webhook in the AlgoWay dashboard.
2. Install the current AlgoWayWS-MT5 Expert Advisor.
3. Enable algorithmic trading in MetaTrader 5.
4. Allow the permissions required by the EA setup guide.
5. Enter the AlgoWay webhook UUID into the EA inputs.
6. Confirm that the EA connection is active.
7. Create or test a valid AlgoWay JSON message.
8. Check symbol mapping against MT5 Market Watch.
9. Test order size with a safe small value.
10. Check AlgoWay webhook logs and MT5 Experts logs together.

Basic TradingView to MT5 JSON Example

For a TradingView strategy alert, the JSON message can use TradingView placeholders:

{
  "platform_name": "metatrader5",
  "ticker": "{{ticker}}",
  "order_contracts": "{{strategy.order.contracts}}",
  "order_action": "{{strategy.market_position}}",
  "price": "{{close}}"
}

If you receive a webhook Error 415, check whether the TradingView alert message is valid JSON. See: AlgoWay webhook Error 415 explained.

Migration Map: Old v1.84 Reference to Current Guides

Old v1.84 topic	Current action	Where to go
Webhook ID	Use current AlgoWay webhook UUID in AlgoWayWS-MT5 EA	MT5 connection guide
Reverse / Hedge / Opposite	Select execution behavior for opposite signals	Modes guide
Coefficient for lots	Test size conversion before live trading	Risk management guide
Trailing Stop	Use current trailing and SL/TP logic	SL/TP and trailing guide
Symbol mapping	Match incoming ticker to exact MT5 broker symbol	MT5 troubleshooting guide
Alert fields	Use the current AlgoWay JSON schema	JSON schema guide

Common Problems When Users Arrive from Old v1.84 Documentation

Problem 1: The user installs an old EA build

Use the current AlgoWayWS-MT5 EA from the current AlgoWay setup flow. Old files and old parameter screenshots can create mismatches with the current dashboard.

Problem 2: The webhook UUID is pasted incorrectly

Paste only the UUID required by the EA input. Do not add quotes, spaces, unrelated text, or the wrong webhook from another platform.

Problem 3: TradingView sends invalid JSON

AlgoWay automation expects a structured message. If TradingView sends plain text or broken JSON, the webhook may be rejected before MT5 receives anything.

Problem 4: The symbol does not exist in the broker's MT5 terminal

Check Market Watch. If the broker symbol has a suffix or prefix, add correct symbol mapping.

Problem 5: The lot size is too large or too small

Review the sizing coefficient and broker minimum lot rules. A correct signal can still fail if the final lot is outside broker limits.

Problem 6: The selected mode does not match the account type

Do not select Hedge behavior if the destination account does not support separate long and short positions. Check the platform mode and AlgoWay mode together.

How to Use This Legacy Reference

This reference remains available because older installations, screenshots and configuration notes may still use the v1.84 parameter names. The updated content connects those earlier concepts with the current AlgoWayWS-MT5 setup.

Use it as a bridge between the earlier parameter set and the current workflow:

• old users can still recognize the v1.84 parameter context;
• new users can find the current AlgoWayWS-MT5 EA setup;
• the explanations connect earlier parameter names with current MT5 automation behavior;
• internal links send users to current articles instead of leaving them in outdated documentation.

Final Recommendation

If you are using AlgoWay today, start with the current MT5 setup guide, not with the old v1.84 parameter list. Use this page as a map: it explains what the old parameters meant, which concepts still matter, and where the current documentation lives.

For current MT5 automation, use AlgoWayWS-MT5 EA 2.10, configure the webhook UUID from the AlgoWay dashboard, validate your JSON message, confirm symbol mapping, and test execution before live trading.

Current Documentation Links

• How to connect TradingView to MetaTrader 5 with AlgoWay EA
• AlgoWayWS-MT5 WebSocket EA setup guide
• AlgoWay JSON schema guide
• Advanced risk management and trade automation
• Hedge, Reverse and Opposite mode guide
• Common MT5 errors guide
• MT5 Error 4752 guide
• MT5 Error 4756 guide
• Webhook Error 415 guide