Spread Sniper — Complete Guide

1. What Spread Sniper targets

Spread Sniper is built around a different signal than the other two strategies: instead of comparing the same side of the book across exchanges (best bid vs. best bid), it hunts for an unusually wide gap between the bid and the ask of the same order book — either within a single exchange (intra-exchange) or across two exchanges (cross-exchange). When that gap is wide enough, you place limit orders on both sides at once and profit as the market converges back toward a normal spread.

Both legs here are maker orders — you're not taking existing liquidity, you're supplying it on both sides of an abnormal gap. That's what makes this the highest-risk of the three strategies: you need both orders to fill, and there's no guarantee either one does before the anomaly disappears.

2. Why abnormal spreads appear

A 3-4%+ bid-ask spread on liquid pairs is not normal — it usually signals one of:

A sudden liquidity withdrawal (market makers pulling quotes around news or volatility spikes).
A thin altcoin book where the last real trade happened a while ago and the remaining orders are stale.
A temporary imbalance right after a large market order has "eaten" one side of the book.

These are genuinely different situations, and part of reading the opportunity well is judging which one you're looking at — a stale, illiquid book (with near-zero volume) is a trap, not an opportunity, even if the percentage looks attractive.

3. The math

Detecting and pricing the opportunity

Spread % = (Best Ask − Best Bid) / Best Bid × 100

ArbiMaster flags candidates above a configurable anomaly threshold (typically ≥ 3–4% for a genuine anomaly, though the platform's own minimum profitability floor for this strategy is ≥ 0.5% net of fees). Once flagged, both legs are priced as limit orders placed inside the spread — a bid above the current best bid, an ask below the current best ask — to maximize the chance of getting filled on both sides before the gap closes.

Because both legs are maker/maker, fees are typically lower per leg than taker/taker — but you pay for that with fill-timing uncertainty on two orders instead of zero.

Worked example

Best Bid = $40,000 (2.5 BTC available)
Best Ask = $41,600 (1.8 BTC available) → spread: 4.0%
Tradeable volume: min(2.5, 1.8) = 1.8 BTC
Place a maker buy near $40,050 and a maker sell near $41,550 simultaneously.
If both fill: ≈ 3.8% net capture after fees on the 1.8 BTC.

4. Step-by-step execution flow

1Scan continuously for anomalies. ArbiMaster evaluates every monitored order book against your configured minimum spread and flags outliers in real time.

2Verify depth at both target price levels — not just at the top of book. Placing size beyond what's really there causes slippage that can erase the whole edge.

3Place both limit orders together — a buy limit and a sell limit, positioned inside the spread to improve fill odds on both sides.

4Monitor the fill window closely. Both orders need to fill before the anomaly corrects itself — the tighter your monitoring, the faster you can react if only one side fills.

5Have a contingency for a one-sided fill. If only the buy or only the sell fills, you're left with a directional position — decide in advance whether you'll cancel the other order and hold, or chase the fill at a worse price.

5. Setting it up on ArbiMaster

The Spread Sniper scanner continuously evaluates order books across your watchlist coins (configured in Settings) and reports both intra-exchange and cross-exchange anomalies above your minimum spread threshold (default ≥ 0.5%). As with the other strategies, Telegram alerts are deduplicated per opportunity with a strategy-level cooldown, so you're notified once per meaningfully new anomaly rather than on every refresh.

6. Risks to keep in mind

One-sided fill risk: the defining risk of this strategy — one leg fills, the market moves, and you're left holding a directional position you didn't intend to take.

Sudden reversion: abnormal spreads often correct within seconds as other market participants (including other bots) close the gap before you do.

Slippage on thin books: a wide spread on a low-volume altcoin pair is frequently a symptom of a dead market, not a real opportunity — always cross-check 24h volume, not just the instantaneous book.

Faster execution required: this strategy needs tighter monitoring and quicker reaction than Simple or Market Maker Arbitrage, since both fills are uncertain simultaneously.

7. Best practices

Cross-check 24h volume, not just book depth. A thin instantaneous book can look deep for a split second and then vanish — 24h volume tells you whether the pair actually trades.

Set a hard cancel timer on both legs so an unfilled order doesn't sit exposed to a market that's already moved on.

Prefer high-volume pairs where genuine, tradeable anomalies are rarer but far more reliable than the constant noise on illiquid altcoins.

Decide your one-sided-fill policy before you trade — not in the moment it happens.

FAQ

Why is this the highest-risk of the three strategies?

Because both legs are maker orders with no fill guarantee, versus zero uncertain legs in Simple Arbitrage and one in Market Maker Arbitrage. Two independent uncertainties compound the risk of ending up with an unwanted directional position.

Intra-exchange or cross-exchange — which is better?

Intra-exchange removes cross-venue latency and doesn't require pre-funding two exchanges for that specific trade, but genuine wide-spread anomalies within a single healthy order book are rarer. Cross-exchange finds more candidates but reintroduces the coordination and latency considerations of the other strategies.