Kalshi Trade Connector

Features

fix-kalshiConnector Key

Instruments

FX

Request Types

SUBMITCANCELREPLACE

Order Types

LIMIT

Time In Force

GTCIOCGTDFOK

Order ID Mapper

COMPOSITE

✗

Order Status Request

✓

Cancel On Disconnect

✓

Commission

✓

Post Only

✓

Fast Cancel

✓

Fast Replace

Notes

Description

Kalshi FIX connector can be configured either for Predictions or Perps trading.

Name	Host	Port	Target Comp ID
Predictions	mm.fix.elections.kalshi.com	8228	KalshiNR
Perps	margin-mm.fix.elections.kalshi.com	8228	KalshiNR

Cancel On Disconnect

Kalshi supports Cancel On Disconnect and connector enables it by default: cancelOnDisconnect = true.

Connectivity

Kalshi FIX API requires secure (TLS) connection:

[KALSHI]
client = yes
accept = 18228
connect = mm.fix.elections.kalshi.com:8228
verify = 0

note

Only one FIX connection is allowed per API key. Separate API keys are required for concurrent connections.

Private Connectivity

For participants requiring network-level isolation, Kalshi supports private connectivity via AWS PrivateLink. With PrivateLink, FIX traffic is routed entirely within the AWS backbone and never traverses the public internet.

Symbology

• Markets Endpoint
  https://docs.kalshi.com/api-reference/market/get-markets

Kalshi FIX does not have any specific schedule.

Sessions may be disconnected during the maintenance window. Kalshi does not initiate sequence number resets during maintenance.

Configuration

Connector settings

Parameter	Default Value	Description
targetCompId	KalshiNR	TargetCompID(56). Allowed values: KalshiNR - OE session without retransmission, KalshiRT - OE session with retransmission.
senderCompId		SenderCompID(49). FIX API Key (UUID format).
senderSubId		SenderSubID(50). Assigned value used to identify message originator. Clearing FCM sponsored access only.
useTrader	false	The flag to define whether to use order TraderId as SenderSubID(50) in preference of senderSubId setting.
privateKey		RSA private key.
cancelOnDisconnect	true	Cancel orders on any disconnection, including graceful logout.
messageRetentionPeriod	24	How long session messages are stored for retransmission, in hours. Max 72.
selfMatchPrevention		Self-trade prevention behavior: CANCEL_NEWEST, CANCEL_OLDEST, or CANCEL_BOTH.
cancelOrderOnPause	true	Cancel order if trading is paused.
account		Default AllocAccount(79). Subaccount number (0–63).
useAccount	false	The flag to define whether to use order account in preference of default account.
parties[].partyId		FCM only. Sub-account identifier.
parties[].partyRole		FCM only. Allowed values: 24 - Customer Account.

Supported order attributes

Key	Description
79	AllocAccount(79). Subaccount number (0–63).
50	SenderSubID(50). Overrides senderSubId setting for a particular order request.
18	Post only. '6' value used for post only orders submission.
100	Exchange index. On event-contract sessions, omit or use -1 to auto-route by market ticker. This field should not be included for margin. It will be ignored. See Exchange Sharding.
2964	Self-Match Prevention Type. Allowed values: 1 - Cancel Taker, 2 - Cancel Maker.
21006	Cancel order if trading is paused. Allowed values: Y, N.

Config sample

connectors {
  KALSHI : ${template.connector.fix.kalshi} {
    settings : {
      host = "<STUNNEL_HOST>"
      port = <STUNNEL_PORT>

      senderCompId = "<API_KEY_UUID>"
      targetCompId = "KalshiNR"

      privateKey = "<PRIVATE_KEY>"
    }
  }
}