Predictefy vs Tatum (2026): Polymarket and Kalshi APIs Compared
The Short Answer
Predictefy is the better choice for most prediction market builders: it covers 15+ venues, starts free with monthly credits, and adds cross-venue matching, an arbitrage feed on Pro, trader intelligence and trading. Tatum is a blockchain infrastructure company whose Prediction API adds Polymarket and Kalshi, with events, markets, prices, order books, history and wallet data, under its general Tatum plans. Choose Tatum if you already use it for blockchain nodes and data and only need those two venues. Choose Predictefy to cover the whole prediction market landscape in one schema.
Key Takeaways
- Venues: Predictefy serves 15+; Tatum's Prediction API supports Polymarket and Kalshi.
- Both normalize markets, prices, order books and history across their venues behind one key.
- Tatum's free plan gives 100,000 lifetime credits across all of Tatum; Predictefy's Free plan renews 25,000 credits every month.
- Predictefy adds matched markets, an executable arbitrage feed on Pro, smart-money analytics, streams and order building for trading.
- Some Tatum features apply to one venue only; for example, market positions are Polymarket-only.
How do Predictefy and Tatum compare?
| Predictefy | Tatum Prediction API | |
|---|---|---|
| Focus | Prediction markets | Blockchain infrastructure, with a prediction markets product |
| Venues | 15+, including Polymarket, Kalshi, Polymarket US, Gemini, Limitless, Opinion, Hyperliquid, SX Bet, Myriad and Novig | Polymarket and Kalshi |
| Data | Markets, prices, order books, trades, OHLCV, history, holders | Events, markets, prices, order books, price history, recent trades, wallet activity |
| Interfaces | REST, WebSocket streams, TypeScript and Python SDKs, MCP server, CLI | REST with an x-api-key header |
| Free start | $0 plan, 25,000 credits every month | Free plan with 100,000 lifetime credits across Tatum |
| Paid plans | Builder $48.88 a month, Pro $149 a month, Enterprise custom | Tatum's credit plans; dedicated keys from $99 a month |
| Cross-venue matching | Yes, on every plan | Not documented |
| Arbitrage feed | Yes, executable-checked, on Pro | Not documented |
| Trading | Orders built server side, signed in your wallet; paper trading | Data API |
Tatum details are from its documentation, product and pricing pages as of 16 October 2026; Predictefy details are from its pricing guide on the same date.
How many venues does each cover?
Tatum's Prediction API documents two platforms, Polymarket and Kalshi, and some endpoints and filters apply to only one of them: market positions are Polymarket-only, and several listing filters need platform=polymarket. Its responses also mark that volume is in US dollars for Polymarket and in contracts for Kalshi. Predictefy serves 15+ venues with the same verbs on each, so adding Gemini, Limitless, Opinion or Hyperliquid is a change of venue name rather than a new integration.
What will each cost?
Tatum's free plan includes 2 API keys and 100,000 lifetime credits, shared with everything else on Tatum. Paid plans are priced by monthly credits across Tatum's products, and dedicated API keys with guaranteed throughput run from $99 a month for 10 requests a second to $1,049 a month for 100.
Predictefy's Free plan renews 25,000 credits every month, where a market lookup costs 1 credit and an order book 5. Builder is $48.88 a month for 250,000 credits and 20 live streams, and Pro is $149 a month for 2,000,000 credits with the arbitrage feed, price-gap feed and history replay. A prediction market app can run on Predictefy's free plan indefinitely while it is small.
What does Predictefy add?
- Cross-venue matching that groups the same event on every venue, with a judged equivalence verdict.
- An executable arbitrage feed on Pro, which checks depth at your size, fees and resolution equivalence.
- Trader intelligence: smart-money trades scored 0 to 100, wallet profiles and leaderboards.
- Live streams of books, trades and prices over one WebSocket.
- Trading: orders signed in your own wallet, plus paper trading against real books at 0 credits.
- SDKs and an MCP server for TypeScript, Python and AI agents.
When does Tatum make sense?
If you already run on Tatum for RPC nodes, wallet data or notifications across blockchains, its Prediction API puts Polymarket and Kalshi on the same key and bill. Its wallet APIs are also useful for looking at Polymarket activity by address alongside other on-chain data.
Which should you build on?
For a prediction market product, Predictefy: 15+ venues, renewing free credits, and cross-venue and trading features built for the category. For a blockchain product that wants Polymarket and Kalshi next to its existing Tatum stack, Tatum. For more options, see the best prediction market data APIs.
Official references: Predictefy pricing, Tatum pricing.
Frequently Asked Questions
Is Predictefy or Tatum better for prediction market data?
Predictefy, for most prediction market products: 15+ venues against Tatum's two, a monthly free allowance, cross-venue matching, an arbitrage feed on Pro, and trading.
Which prediction markets does Tatum support?
Polymarket and Kalshi, according to Tatum's Prediction API documentation. Some features, such as market positions, are Polymarket-only.
Does Tatum have a free plan?
Yes. It includes 2 API keys and 100,000 lifetime credits shared across Tatum's products.
Does Predictefy have a free plan?
Yes. Free is $0 with 25,000 credits renewed every month across 15+ venues, with no card needed.
Can I trade prediction markets through Predictefy?
Yes. Predictefy builds orders server side and you sign them in your own wallet, and paper trading is included on every plan.