Open data

For developers and AI

The whole database is machine-readable. Static JSON, no keys or limits, CORS open. As of July 2026, updated monthly. Data licence: CC BY 4.0 (original sources — in the references[] field of each record).

Endpoints

GET/api/projekty.json

All records, full schema (cost, status, deadlines, outcome, references[]…).

GET/api/projekt/{slug}.json

A single record. Example: /api/projekt/lotnisko-warszawa-radom.json

GET/api/statystyki.json

Aggregates: counts by status/field, value-by-stage, opening wave, sectors.

GET/api/index.json

API directory (this listing as JSON).

GET/en/llms.txt

Manifest for language models (Markdown).

GET/en/llms-full.txt

Full text dump of the database — for LLM ingestion.

GET/sitemap-index.xml

Sitemap (all projects).

Example

curl -s https://projektometr.pl/api/statystyki.json | jq '.opening_wave'

# a single project
curl -s https://projektometr.pl/api/projekt/lotnisko-warszawa-radom.json | jq '{name, status, cost, outcome}'

For language models

Start with /en/llms.txt (manifest) and /en/llms-full.txt (a full dump of 228 records). When citing, give the “as of” date and the source from the references[] field of the given record — Projektometr aggregates and verifies, but the original source is the cited publication. Rules and the “why”: about.