The phrase "passive income" gets thrown around loosely, but prediction market arbitrage is one of the few strategies that genuinely qualifies — once the system is running, it requires little daily input. Here's an honest breakdown of what that looks like in practice.

What makes arbitrage "passive"?

Unlike directional trading — which requires research, conviction, and constant monitoring — arbitrage is mechanical. The process is simple:

Agent scans for price discrepancies across Polymarket and Kalshi
When the combined cost of both sides is < $1.00 (after fees), it alerts you with both legs ready to place
Once you place both legs, the profit is locked in regardless of outcome
Contracts settle on the platforms when the event resolves

With an automated agent like Arbitrage Agent, steps 1–2 are automatic; you place the orders yourself on your own accounts (automated execution is still in testing and is not live yet). Check your dashboard, and size positions within your own limits.

Realistic monthly income by capital tier

Based on the measured median (about 0.7% net edge per position after fees, capital committed for a median of about 230 days, so about 1.1% a year; live figures on /proof). These assume the capital is fully deployed:

$1,000 deployed: ~$11/year (about $1/month)
$3,000 deployed: ~$33/year (about $2.75/month)
$5,000 deployed: ~$55/year (about $4.60/month)
$10,000 deployed: ~$110/year (about $9/month)
$25,000 deployed: ~$275/year (about $23/month)

These are medians, not promises, and they depend on which positions you take. At this size a $199/year subscription needs roughly $18,000 deployed to pay for itself at the median, so the return only makes sense on capital you already hold on both platforms.

Setup time: what it actually takes

Initial setup is quick:

Create and fund Polymarket + Kalshi accounts (15 min)
Sign in to Arbitrage Agent and set your alert preferences (5 min)
Decide your own position limits and max exposure per market (5 min)
Follow the live alerts for a few days without placing orders to see the spreads and frequency (5 min)
Place the two legs yourself when an alert looks right

After that, ongoing time depends on how many alerts you act on; keep both platform accounts funded.

What could go wrong?

Arbitrage is low-risk, not zero-risk. Being honest about the downsides:

Execution risk: One leg fills, the other doesn't. You place the legs yourself, so place the thinner one first; it can happen on thin markets.
Platform risk: If Polymarket or Kalshi has downtime, the alerts may be unusable. Capital is safe but idle.
Low-activity periods: When markets are quiet, opportunities are fewer. Returns aren't perfectly consistent month to month.
Fee changes: If platforms raise fees, net edges compress. The agent auto-calculates net edge after fees, so it won't alert you to unprofitable spreads.

Arbitrage vs other passive income sources

How does it compare to alternatives? Honestly — for a typical signal, it doesn't beat a high-yield savings account on raw yield. What it offers is a different risk profile, not a bigger number:

High-yield savings (5% APY): ~$42/month on $10K. Safe, liquid, and the benchmark most alternatives should be measured against — but the rate resets whenever the Fed cuts.
Dividend stocks (3–4% yield): ~$30/month on $10K, plus price risk. Requires stock market exposure. Arbitrage is market-neutral.
Crypto staking (4–8%): ~$50–67/month on $10K. Requires holding volatile assets — the yield doesn't protect you from a price crash. Arbitrage doesn't carry directional risk at all.
Prediction market arbitrage (about 1% a year at the median): ~$9/month on $10K at the median. Lower than savings for the median position, but genuinely market-neutral, and your capital never leaves your own exchange accounts.

The honest pitch isn't a bigger number than a savings account — for most signals it isn't. It's a return with a different, and arguably better, risk profile: no rate-cut exposure, no market exposure, no counterparty custody. The trade-off is liquidity constraints — you can put $1M into a savings account but not into prediction market arbitrage. The strategy works best with $1K–$25K.

Is it truly passive?

On a scale of 1 (dividend stocks) to 10 (day trading), prediction market arbitrage with an automated agent scores about a 2. The agent does the work. You monitor it. That's as close to passive as active markets get.

Get started with Arbitrage Agent and put your capital to work.

Key terms: Prediction Market Arbitrage · Directional Exposure · Spread

Prediction Market Arbitrage as Passive Income: A Realistic 2026 Guide