Is any arbitrage betting bot actually free?

Yes. Claw Arbs is currently free during its testing period, with over 1,000 active users. Most other arbitrage tools sold as free are either time-limited trials that convert to paid after 7 to 14 days, or freemium versions with heavy feature restrictions such as no execution, limited venues, or lower refresh rates. Genuinely free arbitrage bots that execute both legs across prediction markets and sportsbooks are rare, which is why the current testing period on Claw Arbs is worth using while it lasts.

What is the difference between a free arbitrage scanner and a free arbitrage bot?

A free arbitrage scanner shows you a list of opportunities that other people have already found. A free arbitrage bot detects the opportunity and places both legs of the trade automatically. The distinction matters because arbitrage windows often last less than a minute, and the time between seeing an alert and clicking through two sportsbooks is usually longer than the window itself. Scanners are useful for learning, but they are not competitive against bots for anyone trying to profit consistently.

Can I run a free arbitrage bot on Kalshi and Polymarket?

Yes. Prediction markets are a particularly good target for a free bot because their public APIs (Kalshi's WebSocket feed, Polymarket's CLOB) let you connect without paying for third-party odds data. Claw Arbs is set up for exactly this: it ships with Kalshi, Polymarket, Predict.fun, and SX Bet pre-installed and free during the current testing period, so the only cost of running the strategy is your funded venue accounts.

What are the risks of using a free arbitrage bot?

The two main risks are naked leg exposure (leg A fills but leg B fails) and execution delays that let the market move against you between detection and placement. Any serious bot needs a safety pipeline that halts trades on unhedged exposure, deduplicates repeated triggers, and imposes cooldowns per market. A DIY free script rarely has this. Paid tools sometimes have it. Claw Arbs runs a 14-step safety pipeline on every trade attempt including naked leg tracking, kill switch, and per-match rate limiting.

Are free arbitrage bots slower than paid ones?

It depends on the architecture, not the price tag. Some paid tools rely on third-party odds APIs that scrape bookmaker pages and relay them to subscribers, adding 500 to 2000 milliseconds of latency. Claw Arbs is free during testing but connects directly to venue feeds where they exist, which means the detection loop typically runs in around 25 milliseconds on WebSocket-supported venues. Being free does not automatically mean being slow; the connection method matters more than the price.

When should I upgrade to a paid arbitrage tool?

When your bankroll grows past the point where the free tool's constraints start costing you real money. That might mean upgrading for wider venue coverage, better latency, dedicated support, or execution reliability guarantees. Until then, a free bot that executes correctly and covers your target venues is usually better than a paid tool that only detects. Most users graduate to paid tools not because the free ones stopped working, but because their strategy outgrew what the free product covers.

Free Arbitrage Betting Bot: What's Actually Free in 2026

Type "free arbitrage betting bot" into Google and you get a mix of misleading answers. Some pages call themselves free but hide the full product behind a 7-day trial. Others describe a scanner that shows you opportunities but leaves you to click through two sportsbooks yourself, then ask $100 to $500 a month depending on tier. A smaller number are truly free at the software level, but leave you doing the hard part yourself in Python. This guide sorts the categories so you can pick the right one for your goal.

The short version: as of July 2026, Claw Arbs is currently free during its testing period, with over 1,000 active users running strategies across Kalshi, Polymarket, Predict.fun, SX Bet, and sharp sportsbooks. That is unusually generous for a full detect-and-execute bot in this space, and it will not stay that way forever. If you're evaluating options, start with the free tools first and see whether they get you where you want to be before committing to paid subscriptions.

The three flavors of "free" in arbitrage software

Most tools calling themselves free fall into one of these buckets. Knowing which bucket you're looking at saves an hour of trial signup and account creation.

1. The trial trick

The product is not free. It has a 7 to 30 day trial period, or a "free forever" plan that omits every feature that matters. RebelBetting and OddsJam both offer trial periods that are useful for testing but eventually roll into $99 to $399 monthly plans. Some free tiers ship with a 30-second refresh rate that makes them useless for live markets. Others cap you to a single sportsbook or country. The trial trick is fine as a way to preview a paid product, but it is not a free arbitrage bot.

2. The DIY free

You get a Python library or an open-source GitHub repo that provides the primitives (venue clients, orderbook parsing, edge calculators). The tool itself is free but you write the strategy, run the servers, handle the failures, and rebuild it every time an API changes. This works if you enjoy the engineering and have time to maintain it. It does not work if you want a working bot on day one.

3. The genuinely free execution bot

The software itself detects opportunities across supported venues, fires both legs automatically when an edge appears, runs a safety pipeline to prevent naked exposure, and asks nothing for the product. You still pay for your funded venue accounts and for whatever fees the venues charge (Kalshi tiered fees, Polymarket gas, etc.), but the software is free. This is a rare category in 2026. Claw Arbs is currently in it, during the testing period.

What actually matters when picking a free arbitrage bot

Before you download anything, know what you are grading on. Free tools vary wildly in these dimensions, and the ones that matter for your strategy depend on which venues you want to trade.

Execution or detection. Detection-only means you get an alert. Execution means the bot places both legs. For any live market where windows close in under 60 seconds, execution is the difference between profit and paper edges you never captured. See our how to find arbitrage bets guide for the full mechanical breakdown.
Latency. How fast the detection loop runs matters more than any other single metric. WebSocket-connected venues (Kalshi, Polymarket) can push updates in around 25 milliseconds. Bots relying on third-party odds APIs typically sit at 500 to 2000 milliseconds. That difference decides whether you catch the edge or arrive after it closes.
Venue coverage. Prediction markets, sharp sportsbooks, soft sportsbooks, and crypto sportsbooks each require different integrations. A free bot with only two venues is a demo, not a working strategy. A useful bot covers 8 or more venues so you can arb across them.
Safety pipeline. Kill switch, naked leg tracking, cooldowns, exposure limits, deduplication. Without these, one bad execution can wipe an unhedged position that never gets filled on the other side. This is the single most under-discussed feature in the space.
Paper trading mode. Before you fund a venue and start firing real orders, run the whole pipeline on live data with orders simulated. Any tool without paper mode is asking you to trust it with real money on day one, which is a bad ask.

Most detection-only paid tools are worse on all five of these than a well-built free execution bot. This is why "free" and "good" are not opposites in this space; they just get combined less often than you'd expect.

Free arbitrage bots ranked

Here's the honest ranking of what is currently available at zero cost in July 2026.

Tool	Type	Execution	Best for
Claw Arbs	Genuinely free (during testing)	Both legs, automated	Prediction market and sharp-vs-soft cross-book strategies
OddsJam free trial	Trial trick	None	Previewing an odds-comparison SaaS product
RebelBetting trial	Trial trick	None	Previewing value-betting alerts
DIY Python (Kalshi/Polymarket APIs)	DIY free	You code it	Developers who want full control
Various GitHub arb scripts	DIY free	Partial, needs maintenance	Learning how bots are built

Note that OddsJam, BetBurger, and RebelBetting all have real merits at their paid tiers. The point is that their free trials are marketing surfaces, not free arbitrage bots. If you're comparing them honestly to Claw Arbs' current testing-period offering, you're comparing "free preview of a paid product" to "free product that executes."

What Claw Arbs actually does at zero cost

Since Claw Arbs is the main "genuinely free execution bot" option right now, it's worth spelling out what you get. The list is what would normally cost between roughly $100 and $500 monthly at a competitor.

12 pre-installed venues: Kalshi, Polymarket, Polymarket US, Predict.fun, SX Bet, Sportmarket, Stake.com, BC.Game, Cloudbet, Bet105, Pinnacle (PS3838), and BetInAsia. Prediction markets, sharp sportsbooks, and crypto sportsbooks all covered without extra integration.
Auto-execution of both legs: the bot detects a cross-venue edge and fires both bets automatically in the same event loop, typically in around 25 milliseconds against WebSocket-supported venues.
Sharp odds aggregator (11 books): blended sharp reference used as the fair-odds line for value betting, tighter than any single sharp book alone.
Three strategies: cross-venue arbitrage, sharp-vs-soft value betting, and cross-book arbitrage between sharp and soft venues.
Snipe mode (limit orders on any bookmaker): place limit orders on venues that don't natively support them, so you can pre-position at your target price and wait.
Community-shared configurations: connect to any additional bookmaker not on the pre-installed list using community-built configuration files.
Paper trading: run everything against live data without any orders leaving your machine.
14-step safety pipeline: kill switch, naked leg tracking, cooldowns, exposure limits, deduplication, per-match rate limiting, and more.

You still need funded venue accounts to run live trades. The bot cannot magic capital into existence; it can only detect and execute against balances you have. But the software layer that would otherwise cost you $2,000 or more per year is currently at zero.

How to decide if free is enough for you

Three questions decide it.

First: are your target venues covered? If you're running a strategy on prediction markets, sharp sportsbook references, or crypto sportsbooks, the pre-installed venue list covers you. If you're focused on US traditional sportsbooks like DraftKings or FanDuel, you'll want to add them through community configurations or reconsider whether traditional books are worth targeting at all given they limit winners aggressively (see our best sportsbooks for arbitrage betting guide).

Second: are you running paper first? A free execution bot with paper mode lets you test everything at zero risk before touching real capital. Any tool without paper mode is asking you to trust it in production, which is a red flag even if the product is free.

Third: how much does an extra 500 milliseconds of latency cost you? If you're running pre-match arbs with 5 to 15 minute windows, latency barely matters and any working tool will do. If you're running live arbs with 5 to 60 second windows, latency is decisive and free bots with direct venue connections beat paid tools that scrape third-party APIs.

If you answered "yes, yes, and it matters" to those three, the current Claw Arbs testing period is the right free option. If you answered "no" to any, either add the missing venues via community configs, or consider a paid tool with the specific gap filled. See our how to find arbitrage bets primer for the wider tool landscape, and try our free arbitrage calculator for verifying opportunities manually before committing to any tool.

When to graduate to paid tools

Not every strategy is going to be served by a free product. A few honest cases where paying makes sense:

You need dedicated customer support because you're running high stakes and a broken execution costs you real money.
Your bankroll is large enough that even 0.1% of latency savings across thousands of trades per month justifies a subscription fee.
You want a managed service where you don't touch the software and just receive alerts, and are happy to place bets by hand.

None of these apply to most retail bettors. If your bankroll is under $50,000 and your strategy fits within the venues Claw Arbs already covers, "free during testing" plus a smart safety pipeline is very likely the best combination on offer right now. Watch the edges live on our free live arbitrage scanner to see what the bot detects across Kalshi, Polymarket, Predict.fun, and SX Bet in real time.

Bottom line

Most "free arbitrage betting bot" search results are marketing for paid products. A few are DIY frameworks that require significant engineering to actually run. Fewer still are genuinely free execution bots that detect and place trades automatically across serious venues.

As of July 2026, Claw Arbs is in the "genuinely free execution bot" category during its current testing period, with over 1,000 active users. If your target venues include prediction markets or sharp sportsbook references, and you want auto-execution rather than manual alerts, it is the strongest free option available right now. Test in paper mode for at least a week before flipping the live execution flag, and see whether it clears your specific bar before paying for anything else.

Related reading: Best Arbitrage Betting Software 2026, How to Find Arbitrage Bets, Prediction Market Arbitrage. Prefer to explore the current opportunities first? See our free live arbitrage scanner or the Kalshi bot and Polymarket bot landing pages.