Kalshi

Kalshi is a CFTC-regulated US exchange for binary event contracts on real-world outcomes - elections, economics, weather, sports, and more. The platform exposes a public REST trading API and WebSocket streams for market data, orders, positions, and portfolio actions, with a published OpenAPI 3 specification and AsyncAPI definition for the streaming surface. A demo environment mirrors production for safe development. Official Python and community SDKs are provided.

Kalshi publishes 21 API contracts indexed on the APIs.io network, including WebSocket Streaming API, AsyncAPI Specification, Account API, and 18 more. Tagged areas include Prediction Markets, Event Contracts, Exchange, CFTC, and Trading.

The Kalshi catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Kalshi’s developer surface includes authentication, documentation, API reference, GitHub presence, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

30.0/100 thin ▬ flat Agent 31/100 agent ready Heartbeat 0/100 dormant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract

Prediction MarketsEvent ContractsExchange CFTC Trading Markets Real-Time

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management

BC-4270

Account

GET /account/limits GET /account/endpoint_costs

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 30.0/100 · thin

Contract Quality 10.9 / 19

Developer Ergonomics 4.3 / 15

Access Clarity 0.8 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.0 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime (on an ambiguous tag, where no other regime matched), so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Agent Skills +5 pts — skills artifact present, graded by who authored it

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 5.3 — up to +18.9 composite points
Developer Ergonomics scores 28.6 — up to +14.3 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/kalshi/apis.yml: open an issue on github.com/api-evangelist/kalshi to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Raycast Store Extensions (first-party publishers + community-wrapped products)	standard	38.3	-	-
IFTTT Services (service publishers)	standard	38.3	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

AsyncAPI

measured — observed by APIs.io (published)

APIs 21

Individual APIs this provider publishes, each with its own machine-readable definition.

Kalshi Trade API (Demo)

Demo / sandbox environment for the Kalshi Trade API - mirrors production semantics with simulated balances and markets for safe development and automated testing.

Kalshi WebSocket Streaming API

Real-time streaming feed for market data, order book updates, fills, and portfolio events on Kalshi. Documented as an AsyncAPI spec alongside the OpenAPI REST surface.

Kalshi AsyncAPI Specification

Machine-readable AsyncAPI description of the Kalshi WebSocket streaming API. Suitable for generating async clients and documenting message schemas.

Kalshi Python Starter Kit

Official Python starter / SDK published by Kalshi for connecting to the Trade REST API and WebSocket streams. Includes request signing, authentication helpers, and example tradi...

Kalshi Account API

The account API from Kalshi — 2 operation(s) for account.

Kalshi API Keys API

API key management endpoints

Kalshi Communications API

Request-for-quote (RFQ) endpoints

Kalshi Events API

Event endpoints

Kalshi Exchange API

Exchange status and information endpoints

Kalshi Fcm API

FCM member specific endpoints

Kalshi Historical API

The historical API from Kalshi — 7 operation(s) for historical.

Kalshi Incentive Programs API

Incentive program endpoints

Kalshi Live Data API

Live data endpoints

Kalshi Market API

The market API from Kalshi — 9 operation(s) for market.

Kalshi Milestone API

Milestone endpoints

Kalshi Multivariate API

Multivariate event collection endpoints

Kalshi Order Groups API

Order group management endpoints

Kalshi Orders API

Order management endpoints

Kalshi Portfolio API

Portfolio and balance information endpoints

Kalshi Search API

Search and filtering endpoints

Kalshi Structured Targets API

Structured targets endpoints

Scroll for all 21

Open Collections 18

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Kalshi Trade API Manual Endpoints account API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account api-keys API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account communications API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account events API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account exchange API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account fcm API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account historical API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account incentive-programs API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account live-data API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account market API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account milestone API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account multivariate API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account order-groups API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account orders API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account portfolio API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account search API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints account structured-targets API

OPEN COLLECTION

Kalshi Trade API Manual Endpoints

OPEN COLLECTION

Scroll for all 18

Kalshi API pricing

Not yet checked against Kalshi's own pricing page. Compiled by API Evangelist on 2026-05-22; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Pro Tier Default: 120 requests per minute

Compiled by API Evangelist, not yet checked against Kalshi's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Kalshi Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Kalshi Rate Limits

2 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Kalshi

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Kalshi Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Kalshi WebSocket Streaming API

Real-time WebSocket streaming feed for the Kalshi CFTC-regulated event contracts exchange. Publishes orderbook updates, public trades, market tickers, user orders, user fills, m...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Kalshi — asyncapi rules

7 rules · 1 errors 6 warnings

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Kalshi Authentication

apiKey · 3 schemes

SECURITY

Kalshi Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Kalshi Agentic Access

98 operations · 31 acting · 1 human-in-the-loop

98 operations · 31 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Help

Help

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Developer Agreement

Developer Agreement

Company 2

The organization behind the API

Website

Website

LinkedIn

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: kalshi
url: https://raw.githubusercontent.com/api-evangelist/kalshi/refs/heads/main/apis.yml
name: Kalshi
kind: company
description: Kalshi is a CFTC-regulated US exchange for binary event contracts on real-world outcomes - elections, economics,
  weather, sports, and more. The platform exposes a public REST trading API and WebSocket streams for market data, orders,
  positions, and portfolio actions, with a published OpenAPI 3 specification and AsyncAPI definition for the streaming surface.
  A demo environment mirrors production for safe development. Official Python and community SDKs are provided.
deliveryModel:
  model: unknown
  license_evidence:
    not_product:
    - kalshi/kalshi-starter-code-python
  open_source: unknown
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/kalshi.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
x-docs-hosting: vercel
tags:
- Prediction Markets
- Event Contracts
- Exchange
- CFTC
- Trading
- Markets
- Real-Time
created: '2026-05-23'
modified: '2026-05-29'
specificationVersion: '0.23'
apis:
- aid: kalshi:trade-api-demo
  name: Kalshi Trade API (Demo)
  description: Demo / sandbox environment for the Kalshi Trade API - mirrors production semantics with simulated balances
    and markets for safe development and automated testing.
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://demo-api.kalshi.co/trade-api/v2
  tags:
  - REST
  - Demo
  - Sandbox
  - Testing
  properties:
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:websocket
  name: Kalshi WebSocket Streaming API
  description: Real-time streaming feed for market data, order book updates, fills, and portfolio events on Kalshi. Documented
    as an AsyncAPI spec alongside the OpenAPI REST surface.
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: wss://api.elections.kalshi.com/trade-api/ws/v2
  tags:
  - WebSocket
  - Streaming
  - Market Data
  properties:
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
  - type: AsyncAPI
    url: https://docs.kalshi.com/asyncapi.yaml
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/kalshi/refs/heads/main/asyncapi/kalshi-asyncapi.yml
- aid: kalshi:asyncapi
  name: Kalshi AsyncAPI Specification
  description: Machine-readable AsyncAPI description of the Kalshi WebSocket streaming API. Suitable for generating async
    clients and documenting message schemas.
  humanURL: https://docs.kalshi.com/
  baseURL: https://docs.kalshi.com/asyncapi.yaml
  tags:
  - AsyncAPI
  - Specification
  - WebSocket
  properties:
  - type: AsyncAPI
    url: https://docs.kalshi.com/asyncapi.yaml
- aid: kalshi:python-starter
  name: Kalshi Python Starter Kit
  description: Official Python starter / SDK published by Kalshi for connecting to the Trade REST API and WebSocket streams.
    Includes request signing, authentication helpers, and example trading flows.
  humanURL: https://github.com/Kalshi/kalshi-starter-code-python
  baseURL: https://github.com/Kalshi/kalshi-starter-code-python
  tags:
  - SDK
  - Python
  - Starter
  properties:
  - type: Repository
    url: https://github.com/Kalshi/kalshi-starter-code-python
- aid: kalshi:kalshi-account-api
  name: Kalshi Account API
  description: The account API from Kalshi — 2 operation(s) for account.
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Account
  tags_raw:
  - account
  properties:
  - type: OpenAPI
    url: openapi/kalshi-account-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-api-keys-api
  name: Kalshi API Keys API
  description: API key management endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - APIKeys
  tags_raw:
  - api-keys
  properties:
  - type: OpenAPI
    url: openapi/kalshi-api-keys-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-communications-api
  name: Kalshi Communications API
  description: Request-for-quote (RFQ) endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Communications
  tags_raw:
  - communications
  properties:
  - type: OpenAPI
    url: openapi/kalshi-communications-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-events-api
  name: Kalshi Events API
  description: Event endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Event
  tags_raw:
  - events
  properties:
  - type: OpenAPI
    url: openapi/kalshi-events-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-exchange-api
  name: Kalshi Exchange API
  description: Exchange status and information endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Exchange
  tags_raw:
  - exchange
  properties:
  - type: OpenAPI
    url: openapi/kalshi-exchange-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-fcm-api
  name: Kalshi Fcm API
  description: FCM member specific endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - FCM
  tags_raw:
  - fcm
  properties:
  - type: OpenAPI
    url: openapi/kalshi-fcm-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-historical-api
  name: Kalshi Historical API
  description: The historical API from Kalshi — 7 operation(s) for historical.
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Historical
  tags_raw:
  - historical
  properties:
  - type: OpenAPI
    url: openapi/kalshi-historical-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-incentive-programs-api
  name: Kalshi Incentive Programs API
  description: Incentive program endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Incentive Programs
  tags_raw:
  - incentive-programs
  properties:
  - type: OpenAPI
    url: openapi/kalshi-incentive-programs-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-live-data-api
  name: Kalshi Live Data API
  description: Live data endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Live Data
  tags_raw:
  - live-data
  properties:
  - type: OpenAPI
    url: openapi/kalshi-live-data-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-market-api
  name: Kalshi Market API
  description: The market API from Kalshi — 9 operation(s) for market.
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Markets
  tags_raw:
  - market
  properties:
  - type: OpenAPI
    url: openapi/kalshi-market-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-milestone-api
  name: Kalshi Milestone API
  description: Milestone endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Milestone
  tags_raw:
  - milestone
  properties:
  - type: OpenAPI
    url: openapi/kalshi-milestone-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-multivariate-api
  name: Kalshi Multivariate API
  description: Multivariate event collection endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Multivariate
  tags_raw:
  - multivariate
  properties:
  - type: OpenAPI
    url: openapi/kalshi-multivariate-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-order-groups-api
  name: Kalshi Order Groups API
  description: Order group management endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - order-groups
  properties:
  - type: OpenAPI
    url: openapi/kalshi-order-groups-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-orders-api
  name: Kalshi Orders API
  description: Order management endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Order
  tags_raw:
  - orders
  properties:
  - type: OpenAPI
    url: openapi/kalshi-orders-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-portfolio-api
  name: Kalshi Portfolio API
  description: Portfolio and balance information endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Portfolio
  tags_raw:
  - portfolio
  properties:
  - type: OpenAPI
    url: openapi/kalshi-portfolio-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-search-api
  name: Kalshi Search API
  description: Search and filtering endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - Search
  tags_raw:
  - search
  properties:
  - type: OpenAPI
    url: openapi/kalshi-search-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
- aid: kalshi:kalshi-structured-targets-api
  name: Kalshi Structured Targets API
  description: Structured targets endpoints
  humanURL: https://docs.kalshi.com/api-reference
  baseURL: https://api.elections.kalshi.com/trade-api/v2
  tags:
  - structured-targets
  properties:
  - type: OpenAPI
    url: openapi/kalshi-structured-targets-api-openapi.yml
  - type: Documentation
    url: https://docs.kalshi.com/api-reference
common:
- type: Plans
  url: plans/kalshi-plans-pricing.yml
- type: RateLimits
  url: rate-limits/kalshi-rate-limits.yml
- type: FinOps
  url: finops/kalshi-finops.yml
- type: CapabilityMap
  url: capabilities/kalshi-capability-edges.yml
  name: Kalshi Business Capability Map
- type: AgenticAccess
  url: agentic-access/kalshi-agentic-access.yml
- type: DomainSecurity
  url: security/kalshi-domain-security.yml
- type: Authentication
  url: authentication/kalshi-authentication.yml
- type: Website
  url: https://kalshi.com/
- type: Documentation
  url: https://docs.kalshi.com/
- type: APIReference
  url: https://docs.kalshi.com/api-reference
- type: Help
  url: https://help.kalshi.com/
- type: GitHub
  url: https://github.com/Kalshi
- type: Developer Agreement
  url: https://kalshi.com/developer-agreement
- type: LinkedIn
  url: https://www.linkedin.com/company/kalshi/
- type: LlmsText
  url: https://docs.kalshi.com/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Kalshi API — frequently asked questions

Does Kalshi have an API?

Yes. APIs.io lists 21 APIs from Kalshi, including Kalshi Trade API (Demo), Kalshi WebSocket Streaming API and Kalshi AsyncAPI Specification, and 18 more.

Is there an OpenAPI specification for the Kalshi API?

Yes. APIs.io indexes 17 OpenAPI specifications for Kalshi, each linked for download from this page.

How do I authenticate with the Kalshi API?

Kalshi uses bearer-token authentication (apiKey · 3 schemes). The details are profiled on APIs.io as Kalshi Authentication.

How much does the Kalshi API cost?

APIs.io lists 1 pricing plan for Kalshi, with each plan's price, limits and inclusions under Pricing on this page.

Is the Kalshi API ready for AI agents?

Kalshi has a Kin Score of 30.0 out of 100 (thin) and an Agent Readiness score of 30.5 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/kalshi"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/kalshi/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/kalshi/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

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