Kalshi data, without the FIX plumbing.
Kalshi data, without the FIX plumbing.
Kalshi data, without the FIX plumbing.
The complete Kalshi dataset — live prices, L2 orderbooks, tick-level history, and every CFTC-cleared resolution — through the same clean REST and WebSocket interface you use for every other venue. Regulated data. Zero infrastructure work.
The complete Kalshi dataset — live prices, L2 orderbooks, tick-level history, and every CFTC-cleared resolution — through the same clean REST and WebSocket interface you use for every other venue. Regulated data. Zero infrastructure work.
Regulated venue
CFTC
Full history
Since launch
Full orderbook
L2 depth
No FIX required
REST + WS
The Kalshi data institutions need, without the Kalshi integration institutions dread.
The Kalshi data institutions need, without the Kalshi integration institutions dread.
The Kalshi data institutions need, without the Kalshi integration institutions dread.
Kalshi's native API is powerful — FIX protocol, WebSocket, REST, sandbox, key rotation. It's also a lot of surface area to integrate. Assymetrix wraps Kalshi in the same simple client you use for Polymarket and Limitless, so one integration covers every venue.
Kalshi's native API is powerful — FIX protocol, WebSocket, REST, sandbox, key rotation. It's also a lot of surface area to integrate. Assymetrix wraps Kalshi in the same simple client you use for Polymarket and Limitless, so one integration covers every venue.
Kalshi's native API is powerful — FIX protocol, WebSocket, REST, sandbox, key rotation. It's also a lot of surface area to integrate. Assymetrix wraps Kalshi in the same simple client you use for Polymarket and Limitless, so one integration covers every venue.
Capability
Kalshi native API
Assymetrix
Live prices and orderbook
Yes (REST/WS/FIX)
Yes (REST/WS)
Historical tick data
Limited endpoints
Since launch
L2 orderbook history
Not available
Any timestamp
Resolution outcomes with metadata
Yes
Yes + audit trail
Cross-venue query (Polymarket, Limitless)
Kalshi only
Every venue, one schema
Integration complexity
FIX or full auth flow
Single API key
Capability
Kalshi native API
Assymetrix
Live prices and orderbook
Yes (REST/WS/FIX)
Yes (REST/WS)
Historical tick data
Limited endpoints
Since launch
L2 orderbook history
Not available
Any timestamp
Resolution outcomes with metadata
Yes
Yes + audit trail
Cross-venue query (Polymarket, Limitless)
Kalshi only
Every venue, one schema
Integration complexity
FIX or full auth flow
Single API key
Fetch Kalshi event contracts in three lines.
Fetch Kalshi event contracts in three lines.
Fetch Kalshi event contracts in three lines.
Same client as every other venue. No FIX gateway required.
Same client as every other venue. No FIX gateway required.
1import os2import requests3 4BASE = "https://api.assymetrix.com/api/v1/sdk"5HEADERS = {"x-api-key": os.environ["ASSYMETRIX_API_KEY"]}6 7# Active Kalshi contracts in the Fed rate series8contracts = requests.get(9 f"{BASE}/markets",10 headers=HEADERS,11 params={12 "platform": "kalshi",13 "search": "KXFED",14 "status": "active",15 "limit": 50,16 },17).json()18 19# Kalshi tickers resolve directly as market IDs20ticker = "KXFED-26MAR19"21 22# Current orderbook — Pro tier, 10x quota weight23book = requests.get(f"{BASE}/markets/{ticker}/orderbook", headers=HEADERS).json()24 25# Settlement data lives on the market record26resolved = requests.get(27 f"{BASE}/markets",28 headers=HEADERS,29 params={"platform": "kalshi", "search": "KXFED", "status": "resolved"},30).json()Why Kalshi matters — and why compliant data matters.
Why Kalshi matters — and why compliant data matters.
Why Kalshi matters — and why compliant data matters.
Kalshi is the regulated home of event contracts in the United States. That regulatory status changes who can participate and how the data must be handled.
Kalshi is the regulated home of event contracts in the United States. That regulatory status changes who can participate and how the data must be handled.
Institutional capital flows here first
Hedge funds and traditional finance desks that couldn't touch offshore prediction markets can trade Kalshi. If you're serving institutional buyers, Kalshi coverage is not optional — it's the venue their compliance team lets them use.
Institutional capital flows here first
Hedge funds and traditional finance desks that couldn't touch offshore prediction markets can trade Kalshi. If you're serving institutional buyers, Kalshi coverage is not optional — it's the venue their compliance team lets them use.
Different market structure
Continuous double auction. Fixed contract sizes. Central clearing. All of this produces different price dynamics than on-chain venues. Cross-venue analytics only work if you have both regulated and offshore data cleanly aligned.
Different market structure
Continuous double auction. Fixed contract sizes. Central clearing. All of this produces different price dynamics than on-chain venues. Cross-venue analytics only work if you have both regulated and offshore data cleanly aligned.
CFTC-cleared resolutions
Kalshi resolutions carry regulatory weight. Assymetrix preserves the full resolution metadata — settlement source, timing, and confirmation — so your audit trail is defensible in institutional workflows.
CFTC-cleared resolutions
Kalshi resolutions carry regulatory weight. Assymetrix preserves the full resolution metadata — settlement source, timing, and confirmation — so your audit trail is defensible in institutional workflows.
Growing coverage of macro and event categories
Fed decisions, elections, macro data releases, congressional action. Kalshi is where the tradeable version of macro news lives. Assymetrix indexes every series and every event, normalized alongside Polymarket for cross-venue analysis.
Growing coverage of macro and event categories
Fed decisions, elections, macro data releases, congressional action. Kalshi is where the tradeable version of macro news lives. Assymetrix indexes every series and every event, normalized alongside Polymarket for cross-venue analysis.
PRICING
Pricing that scales with you.
Pricing that scales with you.
Pricing that scales with you.
Start free. Grow with usage-based tiers. Enterprise gets custom SLAs, dedicated support, and volume commitments.
Start free. Grow with usage-based tiers. Enterprise gets custom SLAs, dedicated support, and volume commitments.
Free
$0
$0
/ month
1,000 requests per day. Live prices across all venues. Real-time WebSocket (limited channels). No credit card required.
Pro
$299
$299
/ month
100k requests per day. Full orderbook depth. All WebSocket channels. Historical data access. Email support.
Enterprise
Custom
Unlimited requests. Full historical bulk export. Dedicated support. 99.9% SLA. Custom venue coverage. Intelligence layer included.
FAQ
Frequently
Frequently
Frequently
Asked Questions
Asked Questions
Asked Questions
Have questions? Our FAQ section has you covered with
quick answers to the most common inquiries.
Have questions? Our FAQ section has you covered with
quick answers to the most common inquiries.
Do I need my own Kalshi account to use this API?
Is this data delivered under Kalshi's redistribution rules?
What historical range do you cover?
Do you support FIX?
Can I query Kalshi and Polymarket for the same underlying event?
Kalshi data, delivered like every other venue.
Kalshi data, delivered like every other venue.
Kalshi data, delivered like every other venue.
One API key. One schema. Full history. Get started free.
One API key. One schema. Full history. Get started free.