Kalshi API Docs: What Traders Should Know
If you searched for kalshi api docs, you’re likely comparing market data and execution APIs for event trading. Kalshi provides an API for accessing its exchange data and placing trades on regulated event contracts. Below I summarize the docs, the differences versus Polymarket-style CLOBs, and why PolyArb is relevant if you trade cross-platform or want fast intra-Polymarket arbitrage.
What Kalshi’s API covers
Kalshi’s API exposes market prices, order placement, and account/settlement endpoints for its regulated event contracts. The docs typically describe REST endpoints for listings, trades, and websockets for live updates. For traders this means you can poll markets, stream live ticks, and place orders programmatically against Kalshi’s matching engine.
Kalshi is a centralized, CFTC-regulated platform focused on event contracts. That regulatory model and account/KYC flow differ materially from Polymarket’s Polygon-based CLOB and pUSD settlement. If your strategy spans both venues, read both sets of docs to reconcile differences in latency, market structure, and settlement.
How Kalshi differs from Polymarket
Polymarket uses a decentralized CLOB on Polygon with pUSD settlement and UMA resolution. Its market mechanics (CTF outcome tokens, split/merge/redeem, and tick-size rules) are distinct from Kalshi’s regulated contract structure. APIs reflect that: Polymarket offers Gamma, Data, and CLOB endpoints and a market WebSocket; Kalshi’s docs will show centralized REST/WebSocket endpoints and account controls tied to US accounts.
Execution and fees also differ. Polymarket’s maker fees are zero and taker fees vary by category; Polymarket sponsors gas via a Relayer. Verify fee schedules in each docset before automating a strategy.
Why PolyArb matters for API-driven traders
If you’re building or buying an arbitrage bot, PolyArb is a ready product that focuses on intra-Polymarket arbitrage. It runs with 40ms latency versus ~800ms for free bots, guarantees a $7.62 minimum edge per trade, sends Telegram and Discord alerts, is non-custodial, and is live today at $99/month.
Rather than stitching together multiple public APIs and handling wallet ops, PolyArb routes through Polymarket’s CLOB and Gamma/Data surfaces to spot and capture combinatorial and binary edges. If you still need cross-platform exposure, use Kalshi’s docs for regulated-market access and treat each venue’s API semantics separately.
Practical next steps
Read Kalshi’s API docs to understand authentication, rate limits, and websocket topics if you intend to integrate that venue. Compare those details against Polymarket’s exact API endpoints: Gamma, Data, CLOB, and the market WebSocket.
If your goal is fast, turnkey intra-Polymarket arbitrage, consider PolyArb as a subscription alternative to building from scratch. Use vendor docs side-by-side to map latency, fees, and settlement differences before you deploy capital.
Start capturing Polymarket edges today
Subscribe to PolyArb for $99/month to get low-latency alerts, a $7.62 minimum guaranteed edge per trade, and non-custodial execution. Live today — try it if you need a turnkey arbitrage edge.
FAQ
- Where can I find Kalshi API docs?
- Check Kalshi’s developer portal or documentation pages on their website. Their docs typically include REST endpoints for market data and trading plus websocket examples for live updates.
- Can I use Kalshi and Polymarket together for arbitrage?
- You can attempt cross-platform strategies, but differences in market mechanics, settlement, fees, and KYC make it complex. PolyArb focuses on intra-Polymarket arbitrage and does not execute trades on Kalshi.
- Does PolyArb require custody of my funds?
- PolyArb is non-custodial. It routes orders through Polymarket’s CLOB while your pUSD and wallet control remain with you.
- What latency can I expect from PolyArb versus free bots?
- PolyArb advertises 40ms latency versus roughly 800ms for many free bots; actual latency depends on your network and location.