Mechanism
In OTC markets there is no single official price. There are quotes, liquidity providers, and broker policies.
“Best execution” often means: we will execute under available conditions, and we are protected by clauses when conditions are bad.
This matters because traders size positions as if execution is deterministic. It isn’t.
Disputes rarely hinge on your chart. They hinge on the broker’s execution policy, reference pricing, and logs.
If you want to survive execution reality, treat fills as probabilistic and test the venue with small size.
Process upgrade: turn this truth into a rule you can actually enforce. If the rule can’t be enforced, it will be broken under stress.
- Write the trigger condition in observable terms.
- Write the action in one sentence.
- Write the penalty for breaking it.
How it kills accounts
Assume perfect fills → oversize → volatile window → slippage / repricing → unexpected loss → dispute → no recourse → account damage.
How it kills accounts:
- The rule exists only in your head.
- Stress arrives and you improvise.
- Improvisation becomes inconsistency.
- Inconsistency becomes random results.
- Random results become a slow bleed.
Rule that survives
Read execution policy like it’s part of the strategy.
Trade as if fills will be worse in stress.
Test your broker during volatility with tiny size before you trade real size.
Rule that survives:
- Write the trigger in observable terms.
- Write the action in one sentence.
- Write the penalty for breaking it.
Example archetype
You assume ‘best execution’ means you’ll be filled near the price shown. In a fast move you get slipped, then you learn what the clause actually meant.
Tell: if your rule isn’t enforceable, it’s a suggestion. Suggestions don’t survive stress.
Deep dive
What to do instead
Link your risk assumptions to contract reality. Start with Order execution ‘best efforts’ and Slippage & requotes disclaimer.
If your strategy requires precision fills, you need an instrument and venue that can actually provide them.
Related
Broker reality: Off-market pricing, Price feed disclaimer.
Field checklist
- Write the rule in observable terms: if X, then Y.
- Remove choices under stress. Choices become rationalizations.
- Track the precursor: what state were you in before the mistake?
- Make deviations costly (size down, pause, review).
- Turn lessons into gates, not notes.