1001 Smart Cities
🇵🇱 Warsaw

Warsaw's Open Data API: Live Bus and Tram Positions Behind an API Key

🤖 AI-generated summary · ◆ 17 sourced claims · 🔎 Last verified

This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.

17 sourced claims on this page, none individually verified yet — turn on “Sources in the text” to see each one.

How this atlas is made · What “last verified” means · What “source-checked” means · The full record behind this page

Warsaw's live bus and tram positions feed apps several million times a week. Their licence is less clear: the national catalogue says CC BY 4.0 and, in the same record, public domain.

Outcome🔄 Ongoing
Evidence🏛️ Officialgrades the sourcing — this entry states no impact figure
what does this mean?The strongest source is the operator's or the city's own reporting — an official report, dataset or press release. It grades who did the looking — not how well the project went. All four grades →
Run byUrząd m.st. Warszawy (Warsaw City Hall), Biuro Cyfryzacji; vehicle positions published by the City Hall, not by the transport authority ZTM
Scale🏙️ City-wide

Part of 1001 Smart Cities — 1,216 documented projects · 🏙️ 8 more in Warsaw · 📊 Open data guide · 📡 Data & IoT projects

Since 2015 Warsaw City Hall has run api.um.warszawa.pl, an open-data platform that serves city datasets through an API, among them the live positions of the city's buses and trams, refreshed every 15 seconds. The city charges nothing for the data, but access needs a registration and a personal API key. In 2022 the city counted several million automated requests a week to the vehicle positions, from apps including Jak dojadę and Automapa. The positions come from the City Hall, not from the transport authority ZTM; the GTFS timetable feed that route planners use is built by an independent developer from ZTM schedule data shared through a restricted endpoint, and in his realtime feed some trip identifiers may not match that timetable. The city says a new portal, dane.um.warszawa.pl, will fully replace the old platform.

Live 📅 since 2015

🎓 Lesson

Openness is described here in places that do not agree. The national catalogue labels the city's transit datasets CC BY 4.0, gives 'Other (Public Domain)' as the licence description in the same record, and points to the city's own terms of use; the city told a European programme it shares data without legal restrictions; and two independent reusers, a 2018 university thesis and the developer of the Warsaw GTFS feeds, read the terms as requiring credit to Miasto Stołeczne Warszawa with a date. A reuser cannot place this data on a licence ladder from the catalogue alone: the label and the conditions belong in one document.

📡 Data & IoTOpen dataPublic transportSensors & IoT

Sources

↗ Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)Regional daily reproducing a City Hall release (credited '/ um.warszawa.pl /'): the City Hall created the api platform in 2015; data served through an API; bus and tram positions updated every 15 seconds; several million automated requests a week to the vehicle-position resource, used by apps including Jak dojadę, Czy na czas, Gdzie ten tramwaj, Real bus and Automapa; Tadeusz Osowski, director of the City Hall's Biuro Cyfryzacji: the city charges no fees and does not ask who downloads the data.
↗ dane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy)Published 31 August 2016 · updated 19 March 2024National open-data catalogue record filed by Warsaw City Hall for the tram-position dataset (record created 31 Aug 2016, modified 19 Mar 2024): licence name 'CC BY 4.0', licence description 'Other (Public Domain)'; access requires registration at api.um.warszawa.pl; terms of use are given on api.um.warszawa.pl.
↗ dane.gov.pl — catalogue record 'Rozkład jazdy komunikacji publicznej' (Urząd m.st. Warszawy)Published 31 August 2016 · updated 19 March 2024Catalogue record filed by Warsaw City Hall for the public-transport timetable dataset, with the same fields: licence name 'CC BY 4.0', licence description 'Other (Public Domain)', registration required, terms of use on api.um.warszawa.pl.
↗ Interreg Europe — Good practice: Open data in the Warsaw way (20 Aug 2024)Good-practice entry owned by the City of Warsaw (PROACTsme project): architecture principles include 'making available without legal restrictions'; the city cites nearly 2 million daily requests to the platform and over 6,000 registered users as evidence of success.
↗ Warsaw University of Technology — Bondarzewska, bachelor's thesis on tram-delay notifications (2018)Published 2018Bachelor's thesis (supervisor Mariusz Kamola) building a tram-delay alert service on the city's tram-position API: reusers must state the date of creation and the source, Miasto Stołeczne Warszawa; some datasets need an API key obtained by creating an account.
Show 3 more sourcesShow fewer
↗ mkuran.pl — GTFS feeds: Warszawski Transport Publiczny (ZTM Warszawa)Independent developer's feed page: the Warsaw GTFS is licensed under ZTM Warszawa's data usage terms (ODbL for bus shapes); the realtime vehicle-position feed falls under the Warsaw Open Data Project usage terms, which require crediting 'Miasto Stołeczne Warszawa', the data download date and a link; vehicle locations come from the City Hall, not ZTM, so some trip_ids may not match the static GTFS.
↗ WarsawGTFS — project README (GitHub)README of the open-source tool that builds the Warsaw GTFS: static data comes from a proprietary endpoint shared by ZTM, with restricted access requiring credentials; realtime feeds use data from dane.um.warszawa.pl with an API key.
↗ Warszawa 19115 — Dane po warszawskuUpdated 21 April 2026City contact-centre page on the 'Dane po warszawsku' project (updated 21 Apr 2026): announces the new portal dane.um.warszawa.pl, which within the coming months will fully replace api.um.warszawa.pl.

📅 How old is the evidence?

Two clocks, kept apart: when this entry’s sources were published, and what has happened to its record in the atlas. Documented span: since 2015. 5 of 8 sources carry a publication date, from 31 August 2016 to 20 August 2024.

When the sources were published

  1. Ministerstwo Cyfryzacji (dane.gov.pl) · national governmentdane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy) · updated 19 March 2024
  2. Ministerstwo Cyfryzacji (dane.gov.pl) · national governmentdane.gov.pl — catalogue record 'Rozkład jazdy komunikacji publicznej' (Urząd m.st. Warszawy) · updated 19 March 2024
  3. Politechnika Warszawska (Warsaw University of Technology) · researchWarsaw University of Technology — Bondarzewska, bachelor's thesis on tram-delay notifications (2018)
  4. Toportal · pressToportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)
  5. Interreg Europe · international organisationInterreg Europe — Good practice: Open data in the Warsaw way (20 Aug 2024)

Every source, with links ↑

What happened to this record

  1. Entered the record
  2. Sources last read

Every revision, permanent →

Show your work What this page rests on and what it can’t tell you · all 17 claims with their sources · the forensic record

Evidence file · public beta 17 addressable claims, 8 source dossiers, one permanent baseline. The file is unreviewed — an AI-assisted structural migration, not a human or expert endorsement. Every revision keeps a permanent copy under revision history.

Inspect the claims, one by one — verbatim text, sources and caveats for all 17

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-0cc4784d93a60fc6 quantitative
Since 2015 Warsaw City Hall has run api.um.warszawa.pl, an open-data platform
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city release says the City Hall created the api platform for open data in 2015.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)
Claim 2 clm-5f1fb9f1015b73ff descriptive
serves city datasets through an API
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
All resources are available through an application programming interface prepared by the City Hall.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)
Claim 3 clm-399ad463c30768b7 quantitative
the live positions of the city's buses and trams, refreshed every 15 seconds
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The release lists online transport data showing the current position of buses and trams, updated every 15 seconds.
Caveat
Other city documentation and reusers have given different refresh intervals over the years; 15 seconds is the city's 2022 statement.

Sources carrying this claim

  1. Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)
Claim 4 clm-6ea538a92f8fa6fd descriptive
The city charges nothing for the data
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The director of the City Hall's digitisation office: 'we charge no fees for it and do not ask who downloads it'.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)
Claim 5 clm-6058b99877897f5c descriptive
access needs a registration and a personal API key
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The catalogue record says access to the dataset requires registration at api.um.warszawa.pl; the 2018 thesis describes creating an account to obtain a unique API key, a mandatory call parameter.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. dane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy)
  2. Warsaw University of Technology — Bondarzewska, bachelor's thesis on tram-delay notifications (2018)
Claim 6 clm-f18cd438ec43b8b1 quantitative
In 2022 the city counted several million automated requests a week to the vehicle positions
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The release says vehicle-position data draws the most interest and receives several million automated requests a week.
Caveat
A usage count reported by the city, not an evaluation of what the data changed.

Sources carrying this claim

  1. Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)
Claim 7 clm-e54d2e9b9851b5ed descriptive
from apps including Jak dojadę and Automapa
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The release names the creators of Jak dojadę, Czy na czas, Gdzie ten tramwaj, Real bus and Automapa among the users.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)
Claim 8 clm-f129c33b0a5d95b6 descriptive
The positions come from the City Hall, not from the transport authority ZTM
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The developer who republishes the feed notes that vehicle locations are supplied by Warsaw City Hall rather than by ZTM.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. mkuran.pl — GTFS feeds: Warszawski Transport Publiczny (ZTM Warszawa)
Claim 9 clm-9bc15a178cf6b4ab descriptive
the GTFS timetable feed that route planners use is built by an independent developer from ZTM schedule data shared through a restricted endpoint
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The WarsawGTFS README says static data comes from a proprietary ZTM endpoint whose access is restricted and needs credentials; the developer's page publishes the resulting warsaw.zip under ZTM's data usage terms.
Caveat
That route planners use this feed rests on the developer's own publication and on the app makers who credit it; no ZTM statement on its own feeds was read.

Sources carrying this claim

  1. WarsawGTFS — project README (GitHub)
  2. mkuran.pl — GTFS feeds: Warszawski Transport Publiczny (ZTM Warszawa)
Claim 10 clm-a3d22492101c6abc descriptive
in his realtime feed some trip identifiers may not match that timetable
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
Because positions come from the City Hall, the developer warns that some trip_ids in the realtime feed may not match any trip in the static GTFS.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. mkuran.pl — GTFS feeds: Warszawski Transport Publiczny (ZTM Warszawa)
Claim 11 clm-d9a3c3cabb17884a descriptive
The city says a new portal, dane.um.warszawa.pl, will fully replace the old platform
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city page announces that within the coming months the new Otwarte dane Warszawy service will fully replace api.um.warszawa.pl.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Warszawa 19115 — Dane po warszawsku
Claim 12 clm-f90dc9edb06d279b quantitative
The national catalogue labels the city's transit datasets CC BY 4.0
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
Both records filed by Warsaw City Hall, for tram positions and for public-transport timetables, carry the licence name 'CC BY 4.0'.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. dane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy)
  2. dane.gov.pl — catalogue record 'Rozkład jazdy komunikacji publicznej' (Urząd m.st. Warszawy)
Claim 13 clm-db118f97fcb07968 descriptive
gives 'Other (Public Domain)' as the licence description in the same record
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The same records carry the licence description 'Other (Public Domain)' next to the CC BY 4.0 name.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. dane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy)
  2. dane.gov.pl — catalogue record 'Rozkład jazdy komunikacji publicznej' (Urząd m.st. Warszawy)
Claim 14 clm-fda4cea7dd623e27 descriptive
points to the city's own terms of use
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
Each record's description says the terms of use for the data are available on api.um.warszawa.pl.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. dane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy)
  2. dane.gov.pl — catalogue record 'Rozkład jazdy komunikacji publicznej' (Urząd m.st. Warszawy)
Claim 15 clm-ac4f22bdff983d7e descriptive
the city told a European programme it shares data without legal restrictions
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city's good-practice entry lists 'making available without legal restrictions' among the platform's architecture principles.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Interreg Europe — Good practice: Open data in the Warsaw way (20 Aug 2024)
Claim 16 clm-65aecea78037ddf8 quantitative
a 2018 university thesis
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The 2018 Warsaw University of Technology thesis states that reusers must give the date of creation and the source, i.e. Miasto Stołeczne Warszawa.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Warsaw University of Technology — Bondarzewska, bachelor's thesis on tram-delay notifications (2018)
Claim 17 clm-7eaf522c5e4812d8 descriptive
the developer of the Warsaw GTFS feeds, read the terms as requiring credit to Miasto Stołeczne Warszawa with a date
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The developer states that the City Hall requires credit naming Miasto Stołeczne Warszawa, the data download date and a link to api.um.warszawa.pl; the thesis reads the same terms as requiring the date of creation and the source.
Caveat
Both are readings by reusers; the city's own terms text is not among the sources.

Sources carrying this claim

  1. mkuran.pl — GTFS feeds: Warszawski Transport Publiczny (ZTM Warszawa)
  2. Warsaw University of Technology — Bondarzewska, bachelor's thesis on tram-delay notifications (2018)
Forensic record — source dossiers, gaps, hashes and the exact revision this page renders

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-10-17-baseline effective 2026-10-17 · created 2026-10-17

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:c912283b8aba1bd9995843f3d861b23008f527f3b35c02ce07442a7d300e2294
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
17
of 17 claims mapped
8
source dossiers
4
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
Urząd m.st. Warszawy (Warsaw City Hall), Biuro Cyfryzacji; vehicle positions published by the City Hall, not by the transport authority ZTM
Actor types
city-government
Funding model
Not recorded
Funding description
Not recorded
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

8 source dossiers

Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022) toportal.pl · 6 linked claims

Open original source ↗

Stable source ID
src-4c0918fa2968146d
Publisher
Name not classified · toportal.pl
Type / language
web-page · language not classified
Published
2022-06-22
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Regional daily reproducing a City Hall release (credited '/ um.warszawa.pl /'): the City Hall created the api platform in 2015; data served through an API; bus and tram positions updated every 15 seconds; several million automated requests a week to the vehicle-position resource, used by apps including Jak dojadę, Czy na czas, Gdzie ten tramwaj, Real bus and Automapa; Tadeusz Osowski, director of the City Hall's Biuro Cyfryzacji: the city charges no fees and does not ask who downloads the data.

Descriptive only — not page/paragraph exact
Claims linked
dane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy) api.dane.gov.pl · 4 linked claims

Open original source ↗

Stable source ID
src-bf124e09aab95477
Publisher
Name not classified · api.dane.gov.pl
Type / language
web-page · language not classified
Published
2016-08-31
Updated
2024-03-19
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

National open-data catalogue record filed by Warsaw City Hall for the tram-position dataset (record created 31 Aug 2016, modified 19 Mar 2024): licence name 'CC BY 4.0', licence description 'Other (Public Domain)'; access requires registration at api.um.warszawa.pl; terms of use are given on api.um.warszawa.pl.

Descriptive only — not page/paragraph exact
Claims linked
dane.gov.pl — catalogue record 'Rozkład jazdy komunikacji publicznej' (Urząd m.st. Warszawy) api.dane.gov.pl · 3 linked claims

Open original source ↗

Stable source ID
src-090f01d8641b177d
Publisher
Name not classified · api.dane.gov.pl
Type / language
web-page · language not classified
Published
2016-08-31
Updated
2024-03-19
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Catalogue record filed by Warsaw City Hall for the public-transport timetable dataset, with the same fields: licence name 'CC BY 4.0', licence description 'Other (Public Domain)', registration required, terms of use on api.um.warszawa.pl.

Descriptive only — not page/paragraph exact
Claims linked
Interreg Europe — Good practice: Open data in the Warsaw way (20 Aug 2024) interregeurope.eu · 1 linked claim

Open original source ↗

Stable source ID
src-099eca9abd25d24b
Publisher
Name not classified · interregeurope.eu
Type / language
web-page · language not classified
Published
2024-08-20
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Good-practice entry owned by the City of Warsaw (PROACTsme project): architecture principles include 'making available without legal restrictions'; the city cites nearly 2 million daily requests to the platform and over 6,000 registered users as evidence of success.

Descriptive only — not page/paragraph exact
Claims linked
Warsaw University of Technology — Bondarzewska, bachelor's thesis on tram-delay notifications (2018) ia.pw.edu.pl · 3 linked claims

Open original source ↗

Stable source ID
src-049cde5bbc346b76
Publisher
Name not classified · ia.pw.edu.pl
Type / language
pdf · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Bachelor's thesis (supervisor Mariusz Kamola) building a tram-delay alert service on the city's tram-position API: reusers must state the date of creation and the source, Miasto Stołeczne Warszawa; some datasets need an API key obtained by creating an account.

Descriptive only — not page/paragraph exact
Claims linked
mkuran.pl — GTFS feeds: Warszawski Transport Publiczny (ZTM Warszawa) mkuran.pl · 4 linked claims

Open original source ↗

Stable source ID
src-7070bfa09ae70b19
Publisher
Name not classified · mkuran.pl
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Independent developer's feed page: the Warsaw GTFS is licensed under ZTM Warszawa's data usage terms (ODbL for bus shapes); the realtime vehicle-position feed falls under the Warsaw Open Data Project usage terms, which require crediting 'Miasto Stołeczne Warszawa', the data download date and a link; vehicle locations come from the City Hall, not ZTM, so some trip_ids may not match the static GTFS.

Descriptive only — not page/paragraph exact
Claims linked
WarsawGTFS — project README (GitHub) raw.githubusercontent.com · 1 linked claim

Open original source ↗

Stable source ID
src-80027485faae021d
Publisher
Name not classified · raw.githubusercontent.com
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

README of the open-source tool that builds the Warsaw GTFS: static data comes from a proprietary endpoint shared by ZTM, with restricted access requiring credentials; realtime feeds use data from dane.um.warszawa.pl with an API key.

Descriptive only — not page/paragraph exact
Claims linked
Warszawa 19115 — Dane po warszawsku warszawa19115.pl · 1 linked claim

Open original source ↗

Stable source ID
src-980abb36cbf4629f
Publisher
Name not classified · warszawa19115.pl
Type / language
web-page · language not classified
Published
Not recorded
Updated
2026-04-21
Source last checked
No source-level check date
Record last verified
2026-10-17
Dossier created
2026-10-17
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

City contact-centre page on the 'Dane po warszawsku' project (updated 21 Apr 2026): announces the new portal dane.um.warszawa.pl, which within the coming months will fully replace api.um.warszawa.pl.

Descriptive only — not page/paragraph exact
Claims linked
Known limits of this file
  • Publisher names and source languages have not yet been classified; domains are recorded without guessing.
  • Existing source notes are descriptive locators, not page- or paragraph-exact citations.
  • A missing archive, publication date or content hash is shown as null rather than inferred.
  • The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim.

Continue exploring

Compare this project

🇱🇹 Vilnius Open Data Portal · Vilnius Two capitals publishing transit data: Vilnius on an open CKAN portal, Warsaw behind a personal API key with a disputed licence. 🇳🇿 Auckland Transport's Open Transit Feeds: GTFS Timetables and Real-Time Vehicle Data · Auckland Live vehicle feeds behind a free key: Auckland's comes from the transit agency, Warsaw's from City Hall rather than ZTM. 🇩🇪 Munich Open Data Portal (opendata.muenchen.de) · Munich Every Munich dataset names a licence; Warsaw's catalogue records say CC BY 4.0 and public domain at once.

Explore the wider context

🌍 Hardware Stops, Data Doesn't📖 GTFS (General Transit Feed Specification)📖 Open data📖 Urban data platform (UDP)
📎 Cite this project

1001 Smart Cities (2026). “Warsaw's Open Data API: Live Bus and Tram Positions Behind an API Key” — Warsaw, Poland. The Smart City Atlas. https://1001smartcities.org/projects/warsaw-open-data/ (last verified 2026-10-17). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

🚩 Report an error · 🔔 Follow changes to this entry (RSS)

✉️ One source-checked project a week. No pitches, no vendors.

Inside: the Landmark of the Week, one Insight, the newly documented cities. One-click unsubscribe. About the newsletter · RSS