One API for every prediction market.
Unified access to Polymarket, Kalshi, and more — through a single SDK and API.
Supported Exchanges
Unified Markets
Search across Polymarket and Kalshi with a single query. Normalized data, consistent schemas, zero integration headaches.
Managed Trading
We handle exchange authentication, credential encryption, and order routing. You just call the API.
Real-time Data
Live prices, orderbooks, candlesticks, and cross-exchange analytics. All through one endpoint.
How it works
From sign-up to your first trade in four steps.
Register
Create your free account and get an API key in seconds.
Connect Exchanges
Add your Polymarket or Kalshi credentials, or use managed mode.
Query Markets
Search and filter across all exchanges with a single request.
Execute Trades
Place, cancel, and manage orders through one unified API.
Simple by design
A single curl command is all it takes.
# Fetch open prediction markets
curl https://api.papi.market/polymarket/markets \
-H "X-API-Key: papi_sk_your_key"Built for developers
One SDK to connect to every prediction market.
use papi_sdk::{PapiClient, Exchange};
#[tokio::main]
async fn main() {
let client = PapiClient::builder()
.api_key("papi_sk_your_key")
.build();
// List open markets on Polymarket
let markets = client
.markets(Exchange::Polymarket)
.status("open")
.limit(10)
.fetch()
.await
.unwrap();
// Place an order
let order = client
.create_order(Exchange::Polymarket)
.market(&markets[0].id)
.side("buy")
.price(0.65)
.size(100.0)
.execute()
.await
.unwrap();
println!("Order placed: {}", order.id);
}Unified SDK
Trade on Polymarket, Kalshi, and more through a single, consistent interface. No more juggling different APIs, auth flows, and data formats for each exchange.
Ship in managed mode to get started fast, or switch to direct mode when you need full control over your credentials.
View SDK Docs →Manage everything from the dashboard
Monitor your API usage, manage keys, and configure exchanges — all in one place.
API Calls
12,847
Active Keys
3
Exchanges
2
API Calls (last 12h)
Simple, transparent pricing
Get started free during beta. Pricing details coming soon.
Free Beta
CurrentFree during beta
- Unlimited API calls
- All supported exchanges
- Rust SDK access
- WebSocket streaming
Pro
Coming SoonFor teams and power users
- Everything in Free
- Higher rate limits
- Priority support
- Custom integrations
Frequently asked questions
Which prediction markets does PAPI support?
Is PAPI free to use?
What SDKs are available?
How are my exchange credentials stored?
Can I use PAPI for algorithmic trading?
What are the rate limits?
Ready to start trading?
Create an account and get your API key in under a minute.