Predictefy vs FinFeedAPI (2026): Which Prediction Market API Fits
The Short Answer
Predictefy fits teams building prediction market products: it covers 15+ venues with a free start, cross-venue matching, an arbitrage feed on Pro, trader intelligence and trading. FinFeedAPI fits teams who want prediction market history next to the rest of a financial data stack. FinFeedAPI serves prediction markets such as Polymarket, Kalshi, Myriad and Manifold over REST, JSON-RPC and MCP, billed by credits from $1 each on pay as you go. Predictefy starts at $0 with 25,000 credits a month, and Builder at $48.88 a month includes 250,000.
Key Takeaways
- Both offer normalized prediction market data, OHLCV and order books across venues; Predictefy covers more venues, 15+.
- Pricing: Predictefy has a $0 plan and flat monthly plans; FinFeedAPI charges $1 a credit pay as you go, or committed plans from $64 a month.
- Predictefy adds matched markets across venues, an executable arbitrage feed on Pro, smart-money analytics and order building for trading.
- FinFeedAPI offers REST, JSON-RPC and a hosted MCP server; Predictefy offers REST, WebSocket streams, TypeScript and Python SDKs and an MCP server.
- FinFeedAPI's prediction market operations require an API key plus a signed JWT; Predictefy uses one bearer key.
How do Predictefy and FinFeedAPI compare?
| Predictefy | FinFeedAPI | |
|---|---|---|
| Focus | Prediction markets: data, analytics and trading | Financial market data, including prediction markets |
| Venues | 15+, including Polymarket, Kalshi, Polymarket US, Gemini, Limitless, Opinion, Hyperliquid, SX Bet, Myriad and Novig | Includes Polymarket, Kalshi, Myriad and Manifold, per its own documentation |
| Data | Markets, prices, order books, trades, OHLCV, history | Markets, activity, OHLCV, order books, history |
| Interfaces | REST, WebSocket, TypeScript and Python SDKs, MCP server, CLI | REST, JSON-RPC, hosted MCP |
| Auth | One bearer API key | API key plus a signed JWT for prediction market operations |
| Free start | $0 plan, 25,000 credits a month | $25 in non-expiring trial credits on pay as you go, then usage billing |
| Paid plans | Builder $48.88 a month, Pro $149 a month, Enterprise custom | Committed $64 to $1,024 a month, at $0.85 to $0.65 a credit |
| 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 |
FinFeedAPI details are from its own product, documentation 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?
FinFeedAPI's tutorials use exchange IDs including POLYMARKET, KALSHI, MYRIAD and MANIFOLD, and its exchange list endpoint returns the current set. Predictefy serves 15+ venues in one schema, adding exchanges such as Polymarket US, Gemini, Limitless, Opinion, Hyperliquid, SX Bet, Predict.fun and Novig. For anyone comparing prices or building across the US-regulated and crypto-native venues together, that breadth is the deciding factor.
What will each cost?
FinFeedAPI bills in credits: $1 a credit on pay as you go, or committed monthly plans of $64 ($0.85 a credit), $256 ($0.75), $512 ($0.70) and $1,024 ($0.65). Predictefy's Free plan is $0 with 25,000 credits a month, where a market lookup costs 1 credit and an order book 5. Builder is $48.88 a month for 250,000 credits, 300 requests a minute 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. The credit units differ, so compare on your own workload, but Predictefy lets you build and launch before spending anything.
What does Predictefy add?
- Matched markets across venues, with a judged verdict on whether two listings settle the same way.
- An executable arbitrage feed on Pro that checks live depth at your size, fees and resolution equivalence before labeling a row arbitrage.
- Trader intelligence: smart-money trades, wallet profiles, leaderboards and holders.
- Trading and paper trading: orders you sign in your own wallet, and simulated fills against real order books at 0 credits.
- Streams: live books, trades and prices for many venues over one WebSocket.
When does FinFeedAPI make sense?
If you already buy market data from FinFeedAPI for currencies, stocks or crypto, adding its prediction market product keeps one vendor and one billing model. Its JSON-RPC interface and long OHLCV period list, from 1SEC to 5YRS, suit research and archival work.
Which should you build on?
For a prediction market app, bot, dashboard or agent, Predictefy: more venues, a free plan, cross-venue tools and trading built in. For a research or data team consolidating vendors around an existing FinFeedAPI contract, FinFeedAPI. To weigh other options, see the best prediction market data APIs.
Official references: Predictefy pricing, FinFeedAPI product, FinFeedAPI pricing.
Frequently Asked Questions
Is Predictefy or FinFeedAPI better for prediction markets?
Predictefy, for most prediction market products: it covers 15+ venues, has a free plan, and adds cross-venue matching, an arbitrage feed on Pro, and trading.
Which prediction markets does FinFeedAPI cover?
Its documentation uses exchange IDs including Polymarket, Kalshi, Myriad and Manifold, and its exchange list endpoint returns the full current set.
How much does FinFeedAPI cost?
$1 a credit on pay as you go, or committed plans from $64 a month at $0.85 a credit to $1,024 a month at $0.65 a credit.
Does Predictefy have a free plan?
Yes. Free is $0 with 25,000 credits a month across 15+ venues, with no card needed.
Do both offer an MCP server for AI agents?
Yes. FinFeedAPI offers a hosted MCP server, and Predictefy publishes @predictefy/mcp with read, cross-venue, paper trading and opt-in trading tools.