Predictefy vs TheRundown: Prediction Market APIs Compared (2026)

Product details and monthly plan prices checked on October 27, 2026.

How do Predictefy and TheRundown compare?

Why choose Predictefy for prediction-market development?

Predictefy lets a developer start with the market question, find equivalent contracts across venues, and inspect each outcome's price and book. The same integration can serve a sports comparison page, an election dashboard or a research agent. That matters when a product grows beyond fixtures and leagues.

Cross-venue matching is available on every plan. It helps your application group listings before comparing prices, so you can retain each venue's identity and resolution terms. A shared topic alone does not establish equivalent settlement. Review the specific contracts before treating their prices as interchangeable.

Predictefy also supports client-signed trading and paper trading. A team can evaluate a contract, simulate an order and connect its application to the supported execution flow. Read the trading guide for the venue-specific setup.

What does TheRundown's prediction-market feed provide?

TheRundown represents exchanges as affiliates inside its sports data model. Its guide identifies Kalshi as affiliate 25, Polymarket as 26 and Polymarket US as 31. ProphetX and Novig are separate affiliates too. Their prices can appear beside sportsbook prices for the same sports event.

This is useful for an existing sports application that already stores TheRundown event, market and participant IDs. A developer can extend that application to display prediction-market prices while keeping its current game and player data.

Interpret each field by source. TheRundown defines liquidity_usd for Kalshi and Polymarket as approximate resting order-book depth. For Pinnacle, it represents a maximum stake at the quoted price. Those values answer different questions. Neither a shared field name nor a large liquidity figure establishes the fill available for your order.

How should you compare prices and trading costs?

TheRundown uses American odds across its price records. Predictefy exposes normalized prediction-market outcomes. Convert both to the same probability scale before evaluating the difference, and preserve the original source and timestamp.

Then inspect the contract. An NFL winner market may treat overtime, a postponement or cancellation differently from another listing. Matching the teams and start time is only the beginning. Compare resolution rules and executable asks at the size you intend to trade.

Predictefy's Pro arbitrage feed checks depth, venue fees and resolution equivalence at the requested size. Recalculate current execution costs, including network costs where relevant, before placing either leg. A displayed price gap is a research lead.

What will the integration cost?

Predictefy Free includes 25,000 credits a month. Builder is $48.88 a month with 250,000 credits; Pro is $149 with 2,000,000 credits and the arbitrage feed. Commercial use is an Enterprise contract term. The pricing guide explains action costs and access.

TheRundown Starter is $49 a month and adds its prediction-market sources. Its Free plan includes 20,000 data points a day, capped at 200,000 a month, for the three listed sportsbooks with a five-minute delay. Data points count returned price rows, with additional event and score rows in V2 snapshots. Budget from the billed response totals for your intended filters and refresh cadence.

TheRundown assigns Free and Starter to internal business or personal use. Public display in your own app starts on Pro at $149 a month with attribution. Its real-time REST and WebSocket offering starts on Ultra at $399 a month. Choose the plan for both the data access and the way your application will display it.

How should you evaluate a switch?

1. Pick one sports event and one non-sports event your product needs to cover.
2. Map the sports market to venue-native contract IDs and compare the exact settlement terms.
3. Record timestamps, book depth and actual request costs during a representative session.
4. Use Predictefy's matched markets to build the cross-venue view, then test the trading flow in paper mode.

Start with a Predictefy API key and your real event list. The useful comparison is whether the integration supports the product you plan to build.

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