Predictefy vs OddsPapi: Prediction Market APIs Compared (2026)
The Short Answer
Predictefy is our choice for developers who want a prediction market API built around cross-venue research and execution. The Predictefy prediction market API combines 15+ venues, matched markets, WebSocket streams and client-signed trading. OddsPapi combines sportsbook and exchange prices in a wider betting-data feed. It also supports prediction markets, order-book ladders and native venue IDs, so the useful comparison is the workflow each API gives your team.
Key Takeaways
- Predictefy puts prediction market discovery, matching and comparison behind one normalized API.
- OddsPapi's B2B feed combines sportsbook and exchange data, including prediction venues.
- Both expose depth information. Compare the actual book representation, timestamps and size units your application needs.
- Predictefy offers self-serve evaluation credits; OddsPapi directs B2B customers to contact its team for access.
Comparison checked on October 27, 2026. OddsPapi details below refer to its B2B documentation unless stated otherwise.
Predictefy vs OddsPapi at a glance
| Dimension | Predictefy | OddsPapi |
|---|---|---|
| Product model | Prediction market intelligence and execution across 15+ venues | Aggregated betting data across sportsbooks, exchanges and prediction venues |
| Market organization | Venue markets and cross-venue matched clusters | Fixtures, futures, markets and selections |
| Depth representation | Venue order books with source and capability information | Exchange back/lay ladders in odds metadata, up to three rungs deep |
| Streaming | WebSocket market-data channels | WebSocket odds and event channels with cursor-based resume/replay |
| Evaluation path | Free plan with 25,000 monthly credits | Contact-led B2B access; separate v4 documentation also exists |
Choose the data model around your product
For a prediction market terminal, start with the question a contract asks, its outcomes and the venues offering equivalent exposure. Predictefy's matched markets give that comparison a defined API surface. Matching and stored indicative pair price differences are available on every plan.
OddsPapi organizes its feed around fixtures, futures and selections. That model suits a team joining prediction prices to sportsbook moneylines, totals, spreads or player props. Its B2B documentation also represents non-sports prediction topics through futures. Calling it a sports-only feed would miss part of its documented product.
The decision is practical. If your next screen groups equivalent contracts across prediction venues, Predictefy gives you that starting point. If your existing application already revolves around bookmaker selections, assess how the same events and settlement rules map between the two models.
Compare depth and size in the units you trade
OddsPapi supplies exchange ladders through its odds metadata. The prediction-market guide documents back and lay entries with price, share count and stake information, plus native market and outcome IDs. It distinguishes the amount available at the top price from the amount across the displayed ladder.
Predictefy exposes venue order books alongside source timestamps and capability information. That lets an application carry the observed book into a size-aware comparison and keep the venue's own identifiers for the next step.
For either feed, a headline probability is only one input. Decide whether the displayed value is a quote, a midpoint or an executable side. Then walk the available levels at your intended size. Keep shares, currency amounts and decimal odds separate in storage so a conversion does not silently change the exposure.
From a matched price to an assessed trade
Predictefy's Pro arbitrage feed checks book depth, venue fees and resolution equivalence at a requested contract size. This gives a research application a defined qualification step after finding matched markets. Recalculate current prices and execution costs, including network costs, before placing either leg.
OddsPapi's guide explains how to group selections across venues, inspect available size and carry native IDs into an order-routing workflow. It also documents stale-price and suspension signals. Those details matter for a desk using sportsbook prices as a reference for prediction-market quotes.
When your goal is to keep prediction market research and execution in one integration, Predictefy adds a separate client-signed trading flow and paper trading for simulation. Test the sequence using the venues and order types you intend to use.
How should you compare access and cost?
Predictefy starts with 25,000 monthly evaluation credits on Free. Builder is $48.88 a month for 250,000 credits. Pro is $149 for 2,000,000 credits and includes the arbitrage feed, price-gap feed and history replay. Its pricing guide separates plan access from weighted usage. Commercial use is covered by Enterprise terms.
OddsPapi's B2B documentation directs licensed operators, trading firms and enterprise platforms to contact its team for access. Its public site also has a v4 product and a configurable pricing page. Use a quote for the specific B2B feed, venue permissions and historical workload you are evaluating.
A useful evaluation for an odds-comparison desk
Choose one game-winner market and one non-sports event. Record the source IDs, outcome meaning, settlement rule, observation time and depth from each feed. For the sports example, retain overtime and draw treatment. For the non-sports example, retain the cutoff and resolution source.
Use those samples to build the actual screen your team wants. Predictefy is our recommendation when that screen centers on prediction venues and grows into matching, qualification and trading. You can create a key and evaluate that workflow with a bounded sample.
Frequently Asked Questions
Does OddsPapi support prediction markets?
Yes. Its B2B documentation covers prediction venues, exchange depth, native IDs and non-sports topics represented as futures.
Why choose Predictefy over OddsPapi?
Choose Predictefy when your application centers on prediction markets across 15+ venues, matched contracts and a path from research to client-signed execution.
Does OddsPapi include order-book data?
Yes. Its prediction-market guide documents back/lay ladders in odds metadata, with up to three rungs and separate share and stake fields.
Is cross-venue matching included on Predictefy Free?
Yes. Matching and stored indicative pair price differences are available on every plan. The arbitrage and price-gap feeds start on Pro.
Which pricing should I use for OddsPapi?
Confirm a quote for the B2B feed and permissions you need. Its v4 public product and B2B documentation describe separate access paths, so do not assume one price covers both.