Order blocks in practice: the institutional zone.

The order block is probably the most searched concept in Smart Money Concepts (SMC) — and one of the most misunderstood. The marketing version says "it's where the banks buy, just get in there and profit". The reality is soberer: it's a zone of interest with logic behind it, one that works as context, not as a magic button. Here's the honest, practical version.

01What an order block is

An order block is, in the most widely used definition, the last bearish candle before a strong bullish move (a bullish/demand order block) — or the last bullish candle before a sharp drop (a bearish/supply order block). The SMC idea: on that candle, large players ("smart money") supposedly placed institutional orders, and when price comes back to that zone, it tends to react.

02How to identify one (the criteria)

A valid order block isn't just any opposing candle. The criteria that increase its validity:

1. The last opposing candle before the impulse: in a demand order block, it's the last bearish candle before price rips higher.
2. The impulse has to be strong: the move leaving the block should be impulsive, not a weak bounce.
3. There must be a break of structure: the impulse should ideally break a relevant high/low (the break of structure — BOS). That confirms something has changed.
4. Zone not yet "mitigated": an order block is strongest the first time price returns to it. After being tested several times, it loses strength.

03Entry rules

The classic order block trade: you wait for price to return to the zone and look for an entry in the direction of the original impulse. In a demand zone (buy):

• Wait for the return: price rallies (the impulse), then pulls back into the order block.
• Look for confirmation in the zone: don't buy "blind" just because price touched it — wait for a signal (a strong candle, a micro break of structure on the lower timeframe).
• Stop below the block: if price closes below the order block, the thesis failed — a short, well-defined stop.
• Target: the next structural level, or a defined risk/reward ratio.

04Getting started with code detection

Detecting an order block automatically is more complex than a regular indicator, because it involves identifying "impulse" and "structure". A simplified version of the detection logic for a demand order block in Python:

# SIMPLIFIED detection of a demand order block
def detectar_ob_demanda(df, impulso_min=0.003):
    # looks for: a bearish candle followed by a strong bullish impulse
    obs = []
    for i in range(1, len(df)-3):
        vela = df.iloc[i]
        eh_baixa = vela["close"] < vela["open"]
        # impulse: cumulative gain over the next 3 candles
        impulso = (df.iloc[i+3]["close"] - vela["high"]) / vela["high"]
        if eh_baixa and impulso > impulso_min:
            # the OB zone is the body of the bearish candle
            obs.append({
                "indice": i,
                "topo_zona": vela["open"],
                "base_zona": vela["close"],
            })
    return obs

05The honest part about order blocks

SMC became a trend and, with it, plenty of hype. It's worth separating what's reasonable from what's marketing:

• Reasonable: the order block as a zone of interest where relevant activity took place, used with trend context and confirmation. It's a structured way to mark support/resistance with order flow logic.
• Marketing: "the banks always come back to buy at the order block, just get in and profit". There is no universal statistical guarantee. Price respects order blocks sometimes, and ignores them other times.

06Frequently asked questions