MQL5 or MQL4 — which one should your bot be built in?
The two languages look similar and are not. Choosing wrong means paying twice, because almost nothing carries across.
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Knowledge base
Guides
Technical notes on building, testing and deploying trading software. Written for people commissioning a build, not for people choosing a strategy.
What to send when you ask for an EA quotation
A good quotation takes twenty minutes if the brief is complete, and three days of back-and-forth if it is not. Here is what makes the difference.
Read the guidePine Script to MQL5 — what actually changes
Most of a conversion is straightforward. The 10% that is not is where every disagreement about the finished build comes from — so it is worth understanding first.
Read the guideThe testing checklist to run before you accept an EA
This is a software acceptance checklist, not a strategy evaluation. It tells you whether the build does what the specification says — nothing about whether the rules are good.
Read the guideWhy your EA says “Unsupported filling mode”
An EA that worked perfectly on one broker places nothing on another, and the log says retcode 10030. This is almost always one line of missing code.
Read the guideBuilding session and news filters that actually hold
Time filters look like the easy part of a build. They are where a large share of real bugs live, because server time is not your time and midnight is a special case.
Read the guideHow a Telegram to MetaTrader bridge actually works
Four moving parts, and each one fails in its own way. Understanding the shape of it makes the difference between a bridge you trust and one you watch nervously.
Read the guideSetting up a VPS for MetaTrader properly
A VPS is only worth paying for if it is configured so that nobody has to think about it again. Most are not.
Read the guideWhat changes when you automate for Indian markets
Developers who have only built for MetaTrader are repeatedly caught out by Indian segments. The differences are not subtle, and they are all schedule-shaped.
Read the guideIndicator buffers in MQL5, explained properly
Buffers are the one concept that separates an indicator that works from one that redraws itself, eats CPU, or quietly returns zeros.
Read the guideMagic numbers and running several EAs on one account
Two EAs on one account without a magic-number scheme is not a configuration. It is two programs quietly closing each other's trades.
Read the guideHow we version, document and deliver a build
Most disputes in custom software are not about code quality. They are about what was agreed, what was delivered and which build is running.
Read the guideThe risk limits every EA should have, whatever the strategy
These are not strategy rules. They are the layer that sits outside the strategy and limits what a bug, a gap or a bad day can cost.
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Scope
What these guides are
Engineering notes from the work we do — platform differences, implementation detail, test procedure and delivery practice. They exist so that someone commissioning a build can ask better questions and recognise a good answer.
What they are not
None of these guides contains trading advice, a strategy recommendation, a market view or any claim about results. We build software to your specification; what the software should do is always your decision.
Something here you want built?
Send your rules on WhatsApp and we will reply with a written scope, price and timeline.