Predictefy vs ArbBets: The Best ArbBets Alternative (2026)

ArbBets details on this page are quoted from its own website, pricing page, documentation and terms as of September 2026. Predictefy figures come from its public pricing and documentation.

What is ArbBets?

ArbBets is an arbitrage finder for prediction markets. It says it scans Polymarket, Kalshi and Opinion for price discrepancies across "990+ matched pairs across politics, macro, and crypto," and during 2026 it has added funding-rate arbitrage on perpetual futures exchanges, sportsbook arbitrage, a weather edge finder and market-making tools. It walks order book depth, builds Kalshi's taker fee into its numbers and offers free calculators for working out stakes.

ArbBets finds and sizes opportunities, and leaves the trading to you. In its own words, "execution remains on the venue APIs or your broker integration," with an execution agent for Polymarket and Kalshi included in its Premium plan.

Why is Predictefy the best ArbBets alternative?

Because finding a price gap is only the first step, and Predictefy covers the rest: more venues, an API you can afford to call, and a licence to build on it.

More venues means more pairs. An arbitrage scanner can only find gaps between venues it reads. Predictefy matches markets across 15+ venues, including Polymarket, Kalshi, Opinion, Gemini, Polymarket US, Limitless, Predict.fun and SX Bet, so the same event is compared everywhere it trades, not just across three books.

API access starts at $48.88, not $299. ArbBets' Pro plan "includes the scanner dashboard but not API keys," and its API comes with Premium at $299 a month with 5,000 monthly credits. Predictefy's Builder plan includes the arbitrage feed and the API at $48.88 with 500,000 credits. An arbitrage query costs 15 credits, so that is more than 33,000 queries a month.

Streamed, not polled. Predictefy recomputes the whole cross-venue arbitrage surface every 3 seconds by default and streams it over WebSocket, with a full snapshot every 30 seconds and deltas in between. Every frame carries its compute and publish timestamps, so you can measure how fresh it is yourself.

Honest labels. A row is labeled arbitrage only when its net edge is positive, both legs are executable at your requested size against live asks, and the two markets' resolution rules are verified as equivalent. Everything else is served as an indicative price discrepancy, with the reasons it fell short.

How do the arbitrage feeds compare?

Streaming the surface takes one call with the TypeScript SDK:

import { Predictefy } from '@predictefy/sdk';

const client = new Predictefy({ apiKey: process.env.PREDICTEFY_API_KEY });

const close = client.watchArbitrage(
  ({ rows, kind }) => {
    for (const row of rows) console.log(kind, row.label, row.question, row.netEdge, row.roi);
  },
  { executableOnly: true, minEdge: 0.02, onError: (e) => console.error(e.code, e.message) },
);
// call close() to stop streaming

What does each cost?

ArbBets also sells its plans weekly and yearly, and states there is no free trial on paid plans. Predictefy's free plan needs no card and covers market data and trading across 15+ venues, so you can run your own cross-venue checks before upgrading. The arbitrage feed and arbitrage terminal start on Builder.

Which should you use?

Predictefy, for anyone scanning more than three venues or building anything on the results. It matches markets across 15+ venues, streams a live arbitrage surface with honest labels, includes its API from $48.88 with room for more than 33,000 arbitrage queries a month, and adds commercial use from $149. ArbBets' calculators remain a handy free way to check the math on a single opportunity by hand.

For a wider view of the category, see the best prediction market arbitrage tools, or explore the Predictefy API.

Frequently Asked Questions