Prediction Market API Pricing (2026): What Every Provider Charges
The Short Answer
Many prediction market data APIs offer a free plan or trial credits. Paid access can use a subscription, usage billing, or an enterprise contract, so compare the workload and billing unit as well as the monthly figure. The venues' own APIs, such as Kalshi's and Polymarket's, charge nothing for data; you pay trading fees only when you trade. Multi-venue APIs charge for the work of combining venues. Predictefy has a Free plan at $0 with 25,000 credits a month, Builder at $48.88 a month and Pro at $149 a month, all priced in credits per call.
Key Takeaways
- Venue APIs are free for data, so the real price question is about multi-venue providers.
- Predictefy: Free $0, Builder $48.88 a month, Pro $149 a month, Enterprise custom, with annual billing at a discount.
- Credits make cost per call predictable: 1 credit for a market lookup, 5 for an order book, 15 for an arbitrage query.
- Other providers price by requests, points, objects or credits, so compare the unit before you compare the price.
- Check what each plan includes, such as history depth, streams and keys, not only the monthly figure.
How much does a prediction market API cost?
It depends on whose API you call. There are two kinds:
- Venue APIs, run by the exchanges themselves. Kalshi and Polymarket let you read markets, prices and order books for free, and Polymarket's public data routes need no key at all. You pay only the venue's trading fees when you place orders.
- Multi-venue APIs, which combine many venues into one schema. These charge, because matching, normalizing and storing data across venues is the product.
So "how much does it cost" really means: what does one integration across many venues cost, and what unit is it billed in?
What does Predictefy's API cost?
Predictefy prices four plans in credits. These are the figures in its pricing guide as of October 2026:
| Plan | Monthly | Annual | Credits a month | Requests a minute | API keys | Live streams |
|---|---|---|---|---|---|---|
| Free | $0 | None | 25,000 | 60 | 1 | 2 |
| Builder | $48.88 | $469.25 | 250,000 | 300 | 3 | 20 |
| Pro | $149 | $1,430.40 | 2,000,000 | 3,000 | 10 | 100 |
| Enterprise | Custom, from $2,500 | Custom | 5,000,000+ | Custom | Custom | Custom |
Builder and Pro can buy extra credits at $11 and $5.50 per 100,000. Every plan covers 15+ venues, cross-venue matching and paper trading. Builder adds bulk requests and 12 months of history. Pro adds the arbitrage feed, the price-gap feed, history replay and unlimited history.
How do Predictefy credits work?
Each call costs a fixed number of credits, so you can price a workload before you run it:
| Action | Credits |
|---|---|
| Market metadata, search or a price snapshot | 1 |
| Trades, or reference-feed candles | 2 |
| Order book snapshot | 5 |
| Historical query (venue candles) | 5 |
| Cross-venue comparison or price-gap query | 10 |
| Arbitrage query | 15 |
| A live stream | 2 per connection-minute |
A worked example: a dashboard that refreshes 50 market prices every minute uses 50 credits a minute when it calls one at a time. Bulk routes, which start on Builder, charge the base cost per 100 items, so the same refresh as one bulk call costs a single credit. A stream on the same markets costs 2 credits a minute and arrives faster. The ledger at GET /v1/usage (1 credit) shows your balance and what each call cost.
What do other prediction market data APIs cost?
These are the published prices on each provider's own pricing page, checked on 16 October 2026. They bill in different units, which matters more than the headline price.
| Provider | Free tier | Paid plans | Billing unit |
|---|---|---|---|
| Predictefy | $0, 25,000 credits a month | $48.88 and $149 a month, Enterprise custom | Credits per call, 15+ venues |
| Codex | $0 for 10,000 requests a month, after a one-time $1 activation fee | Growth at $350 per million requests | Requests |
| FinFeedAPI | Pay as you go at $1 a credit, including $25 in non-expiring trial credits | Committed plans from $64 a month ($0.85 a credit) to $1,024 a month ($0.65 a credit) | Credits |
| Bitquery | 7-day trial | From $49 a month billed monthly | API points |
| SportsGameOdds | Free tier | Rookie from $99 and Pro from $299 per month; check the billing-period selector | Event objects, sports focused |
Two things to check in any comparison. First, the unit: a "request", a "point", an "object" and a "credit" buy different amounts of data. Second, venue coverage: a cheap plan that serves two venues costs more per venue than it looks.
Which plan should you choose?
- Learning or prototyping: start on Predictefy Free. 25,000 credits is 25,000 market lookups a month, with no card.
- A live dashboard, bot or app: Builder at $48.88 a month gives you 250,000 credits, 300 requests a minute, bulk routes and 20 streams.
- Cross-venue trading and arbitrage research: Pro at $149 a month adds the arbitrage feed, the price-gap feed, history replay and 2,000,000 credits.
- A single venue only: that venue's own free API may be all you need, at the cost of one integration per venue later. Our Kalshi API guide covers Kalshi's side in detail.
Official references: Predictefy pricing, FinFeedAPI pricing, Codex pricing, Bitquery plans, SportsGameOdds pricing.
Frequently Asked Questions
Is there a free prediction market API?
Yes. Kalshi's and Polymarket's own APIs are free for data, and Predictefy's Free plan covers 15+ venues at $0 with 25,000 credits a month and no card.
How much does the Predictefy API cost?
Free is $0, Builder is $48.88 a month or $469.25 a year, Pro is $149 a month or $1,430.40 a year, and Enterprise is a custom contract from $2,500.
Which Predictefy plan includes the arbitrage feed?
Pro and above, at $149 a month. Pro also adds the price-gap feed, history replay and unlimited history.
How many credits does an API call use?
A market lookup, search or price snapshot is 1 credit, an order book or historical query is 5, a cross-venue comparison is 10 and an arbitrage query is 15.
Do Kalshi and Polymarket charge for API access?
Not for data. Both serve market data for free; you pay their trading fees only when you trade.