Chicago Transit Authority

The Chicago Transit Authority (CTA) is the public transit operator for the City of Chicago and 35 surrounding suburbs, operating the second largest public transit system in the United States with bus and rapid-transit (L) train services. The CTA Developer Center publishes open transit data feeds and APIs for developers building rider-facing applications, including the Train Tracker API for real-time L-train arrivals, the Bus Tracker API for real-time bus arrivals and vehicle locations, the Customer Alerts API for service status and disruptions, and GTFS schedule data feeds for the entire CTA bus and rail network.

Chicago Transit Authority publishes 11 API contracts indexed on the APIs.io network, including Arrivals API, Bulletins API, Follow API, and 8 more. Tagged areas include Bus, Bus Tracker, Chicago, CTA, and Customer Alerts.

The Chicago Transit Authority catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Chicago Transit Authority’s developer surface includes engineering blog, authentication, developer portal, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

36.1/100 thin ▬ flat Agent 23/100 agent aware saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

2 published contracts 10 Features 9 Use Cases

BusBus TrackerChicago CTA Customer Alerts GTFSL TrainOpen Data Public Transit Real-Time TrainsTrain TrackerTransit Transportation

Kin Score

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

Composite quality — 36.1/100 · thin

Contract Quality 10.7 / 21

Developer Ergonomics 5.7 / 17

Access Clarity 4.9 / 17

Operational Transparency 0.9 / 11

Contract Governance 1.4 / 10

Discoverability 5.7 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 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 Government & Public Sector regime, 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
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)

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 28.9 — up to +14.2 composite points
Developer Ergonomics scores 33.3 — up to +13.3 composite points
Contract Quality scores 50.5 — up to +12.4 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/chicago-transit-authority/apis.yml: open an issue on github.com/api-evangelist/chicago-transit-authority 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
Transit and Mobility (public transit, rail, micromobility)	standard	44.1	-	1
Rail Sales and Distribution (OSDM, railway union, EU railway licences)	standard	44.1	-	1
Raycast Store Extensions (first-party publishers + community-wrapped products)	standard	44.1	-	1

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.

GTFS

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 11

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

CTA Customer Alerts API

The Customer Alerts API delivers real-time service status, planned outages, and disruption information for CTA bus and rail services. It provides both a route-level status feed ...

CTA GTFS Schedule Feed

CTA publishes a GTFS (General Transit Feed Specification) schedule feed covering the physical layout, stop locations, and static schedules for the entire CTA bus and L train sys...

Chicago Transit Authority Arrivals API

Train arrival prediction operations

Chicago Transit Authority Bulletins API

The Bulletins API from Chicago Transit Authority — 1 operation(s) for bulletins.

Chicago Transit Authority Follow API

Follow an individual train run

Chicago Transit Authority Locations API

Train geolocation operations

Chicago Transit Authority Predictions API

The Predictions API from Chicago Transit Authority — 1 operation(s) for predictions.

Chicago Transit Authority Routes API

The Routes API from Chicago Transit Authority — 3 operation(s) for routes.

Chicago Transit Authority Stops API

The Stops API from Chicago Transit Authority — 1 operation(s) for stops.

Chicago Transit Authority System API

The System API from Chicago Transit Authority — 1 operation(s) for system.

Chicago Transit Authority Vehicles API

The Vehicles API from Chicago Transit Authority — 1 operation(s) for vehicles.

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Open Collections 11

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

CTA Bus Tracker Arrivals API

OPEN COLLECTION

CTA Bus Tracker Arrivals Bulletins API

OPEN COLLECTION

CTA Bus Tracker Arrivals Follow API

OPEN COLLECTION

CTA Bus Tracker Arrivals Locations API

OPEN COLLECTION

CTA Bus Tracker Arrivals Predictions API

OPEN COLLECTION

CTA Bus Tracker Arrivals Routes API

OPEN COLLECTION

CTA Bus Tracker Arrivals Stops API

OPEN COLLECTION

CTA Bus Tracker Arrivals System API

OPEN COLLECTION

CTA Bus Tracker Arrivals Vehicles API

OPEN COLLECTION

CTA Bus Tracker API

OPEN COLLECTION

CTA Train Tracker API

OPEN COLLECTION

Scroll for all 11

Chicago Transit Authority API pricing

Not yet checked against Chicago Transit Authority's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Chicago Transit Authority's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Chicago Transit Authority Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Chicago Transit Authority Rate Limits

5 limits

RATE LIMITS

Service Levels 1

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

Chicago Transit Authority

SLA

FinOps 1

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

Chicago Transit Authority Finops

FINOPS

Features 10

Notable capabilities this provider offers.

Real-Time Train Arrivals

Real-Time Bus Arrivals

Train Run Locations

Bus Vehicle Locations

Route and Stop Directories

Customer Alerts and Service Status

Planned Outage Notifications

GTFS Static Schedule Feed

API Key Issuance

Open Chicago Transit Data

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Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Chicago Transit Authority Context

0 classes · 4 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Chicago Transit Authority API Rules

57 rules · 55 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Chicago Transit Authority Authentication

apiKey · 1 scheme

SECURITY

Chicago Transit Authority Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Chicago Transit Authority Agentic Access

11 operations

11 operations · 0 acting

AGENTIC

Use Cases 9

What developers build with this provider.

Rider-Facing Mobile Apps

Trip Planners and Routing

Real-Time Arrival Displays

Service Disruption Notifications

Schedule Visualizations

Accessibility Tooling

Smart City Dashboards

Multimodal Transit Apps

Research and Open Data Analysis

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Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

ChicagoDataPortal

ChicagoDataPortal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Spectral

Spectral

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

APIKeyApplication

APIKeyApplication

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

ContactUs

ContactUs

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 4

The organization behind the API

Blog

Blog

LinkedIn

Website

Website

Newsroom

Newsroom

Other 2

Properties that don't map to a standard resource type

SystemMap

SystemMap

Source (apis.yml)

aid: chicago-transit-authority
name: Chicago Transit Authority
kind: government
description: The Chicago Transit Authority (CTA) is the public transit operator for the City of Chicago and 35 surrounding
  suburbs, operating the second largest public transit system in the United States with bus and rapid-transit (L) train services.
  The CTA Developer Center publishes open transit data feeds and APIs for developers building rider-facing applications, including
  the Train Tracker API for real-time L-train arrivals, the Bus Tracker API for real-time bus arrivals and vehicle locations,
  the Customer Alerts API for service status and disruptions, and GTFS schedule data feeds for the entire CTA bus and rail
  network.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/chicago-transit-authority.png
url: https://raw.githubusercontent.com/api-evangelist/chicago-transit-authority/refs/heads/main/apis.yml
tags:
- Bus
- Bus Tracker
- Chicago
- CTA
- Customer Alerts
- GTFS
- L Train
- Open Data
- Public Transit
- Real-Time
- Trains
- Train Tracker
- Transit
- Transportation
tags_raw:
- Bus
- Bus Tracker
- Chicago
- CTA
- Customer Alerts
- GTFS
- L Train
- Open Data
- Public Transit
- Real-Time
- Train
- Train Tracker
- Transit
- Transportation
created: '2025-05-02'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: chicago-transit-authority:customer-alerts-api
  name: CTA Customer Alerts API
  description: The Customer Alerts API delivers real-time service status, planned outages, and disruption information for
    CTA bus and rail services. It provides both a route-level status feed and per-route or per-station detail. Authentication
    is not required for the public Customer Alerts feeds.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.transitchicago.com/developers/alerts/
  baseURL: http://www.transitchicago.com/api/1.0
  tags:
  - Customer Alerts
  - Real-Time
  - Service Status
  - Transit
  properties:
  - type: Documentation
    url: https://www.transitchicago.com/developers/alerts/
- aid: chicago-transit-authority:gtfs-feed
  name: CTA GTFS Schedule Feed
  description: CTA publishes a GTFS (General Transit Feed Specification) schedule feed covering the physical layout, stop
    locations, and static schedules for the entire CTA bus and L train system. The feed is a downloadable ZIP archive that
    conforms to the GTFS reference and is updated when CTA service changes.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.transitchicago.com/developers/gtfs/
  baseURL: https://www.transitchicago.com/downloads/sch_data/google_transit.zip
  tags:
  - GTFS
  - Schedule
  - Static
  - Transit
  properties:
  - type: Documentation
    url: https://www.transitchicago.com/developers/gtfs/
  - type: Feed
    url: https://www.transitchicago.com/downloads/sch_data/google_transit.zip
  - type: DataGov
    url: https://catalog.data.gov/dataset/cta-system-information-developer-tool-gtfs-data
  - type: Transitland
    url: https://www.transit.land/feeds/f-dp3-cta
  - type: ChicagoDataPortal
    url: https://data.cityofchicago.org/Transportation/CTA-System-Information-Developer-Tool-GTFS-Data/sp6w-yusg
- aid: chicago-transit-authority:chicago-transit-authority-arrivals-api
  name: Chicago Transit Authority Arrivals API
  description: Train arrival prediction operations
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Arrivals
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-arrivals-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-bulletins-api
  name: Chicago Transit Authority Bulletins API
  description: The Bulletins API from Chicago Transit Authority — 1 operation(s) for bulletins.
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Bulletins
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-bulletins-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-follow-api
  name: Chicago Transit Authority Follow API
  description: Follow an individual train run
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Follow
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-follow-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-locations-api
  name: Chicago Transit Authority Locations API
  description: Train geolocation operations
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Location
  tags_raw:
  - Locations
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-locations-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-predictions-api
  name: Chicago Transit Authority Predictions API
  description: The Predictions API from Chicago Transit Authority — 1 operation(s) for predictions.
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Predictions
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-predictions-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-routes-api
  name: Chicago Transit Authority Routes API
  description: The Routes API from Chicago Transit Authority — 3 operation(s) for routes.
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Routes
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-routes-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-stops-api
  name: Chicago Transit Authority Stops API
  description: The Stops API from Chicago Transit Authority — 1 operation(s) for stops.
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Stops
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-stops-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-system-api
  name: Chicago Transit Authority System API
  description: The System API from Chicago Transit Authority — 1 operation(s) for system.
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - System
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-system-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
- aid: chicago-transit-authority:chicago-transit-authority-vehicles-api
  name: Chicago Transit Authority Vehicles API
  description: The Vehicles API from Chicago Transit Authority — 1 operation(s) for vehicles.
  humanURL: https://www.transitchicago.com/developers/traintracker/
  baseURL: http://lapi.transitchicago.com/api/1.0
  tags:
  - Vehicles
  properties:
  - type: OpenAPI
    url: openapi/chicago-transit-authority-vehicles-api-openapi.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/traintracker/
  - type: APIDocs
    url: https://www.transitchicago.com/developers/ttdocs/
  - type: APIKeyApplication
    url: https://www.transitchicago.com/developers/traintrackerapply/
  - type: TermsOfService
    url: https://www.transitchicago.com/developers/terms/
  - type: Spectral
    url: spectral/chicago-transit-authority-spectral.yml
  - type: Documentation
    url: https://www.transitchicago.com/developers/bustracker/
common:
- type: Plans
  url: plans/chicago-transit-authority-plans-pricing.yml
- type: RateLimits
  url: rate-limits/chicago-transit-authority-rate-limits.yml
- type: FinOps
  url: finops/chicago-transit-authority-finops.yml
- url: https://www.transitchicago.com/updates/
  type: Blog
- type: AgenticAccess
  url: agentic-access/chicago-transit-authority-agentic-access.yml
- type: DomainSecurity
  url: security/chicago-transit-authority-domain-security.yml
- type: Authentication
  url: authentication/chicago-transit-authority-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/chicago-transit-authority
- type: Website
  url: https://www.transitchicago.com/
- type: Portal
  name: CTA Developer Center
  url: https://www.transitchicago.com/developers/
- type: TermsOfService
  url: https://www.transitchicago.com/developers/terms/
- type: PrivacyPolicy
  url: https://www.transitchicago.com/privacy/
- type: APIKeyApplication
  url: https://www.transitchicago.com/developers/traintrackerapply/
- type: ChicagoDataPortal
  url: https://data.cityofchicago.org
- type: SystemMap
  url: https://www.transitchicago.com/maps/
- type: Newsroom
  url: https://www.transitchicago.com/news/
- type: ContactUs
  url: https://www.transitchicago.com/contactus/
- type: JSONLD
  url: json-ld/chicago-transit-authority-context.jsonld
- type: Spectral
  url: spectral/chicago-transit-authority-spectral.yml
- name: Features
  type: Features
  data:
  - name: Real-Time Train Arrivals
  - name: Real-Time Bus Arrivals
  - name: Train Run Locations
  - name: Bus Vehicle Locations
  - name: Route and Stop Directories
  - name: Customer Alerts and Service Status
  - name: Planned Outage Notifications
  - name: GTFS Static Schedule Feed
  - name: API Key Issuance
  - name: Open Chicago Transit Data
- name: UseCases
  type: UseCases
  data:
  - name: Rider-Facing Mobile Apps
  - name: Trip Planners and Routing
  - name: Real-Time Arrival Displays
  - name: Service Disruption Notifications
  - name: Schedule Visualizations
  - name: Accessibility Tooling
  - name: Smart City Dashboards
  - name: Multimodal Transit Apps
  - name: Research and Open Data Analysis
- name: Standards
  type: Standards
  data:
  - name: GTFS
  - name: GTFS-Realtime (consumed via partners)
  - name: REST
  - name: JSON
  - name: XML
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Chicago Transit Authority API — frequently asked questions

Does Chicago Transit Authority have an API?

Yes. APIs.io lists 11 APIs from Chicago Transit Authority, including CTA Customer Alerts API, CTA GTFS Schedule Feed and Chicago Transit Authority Arrivals API, and 8 more.

Is there an OpenAPI specification for the Chicago Transit Authority API?

Yes. APIs.io indexes 9 OpenAPI specifications for Chicago Transit Authority, each linked for download from this page.

How do I authenticate with the Chicago Transit Authority API?

Chicago Transit Authority uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Chicago Transit Authority Authentication.

How much does the Chicago Transit Authority API cost?

APIs.io lists 3 pricing plans for Chicago Transit Authority, with each plan's price, limits and inclusions under Pricing on this page.

Is the Chicago Transit Authority API ready for AI agents?

Chicago Transit Authority has a Kin Score of 36.1 out of 100 (thin) and an Agent Readiness score of 22.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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