Data & API

The registry, as data.

All 140 experiments are available as JSON and CSV under a CC-BY 4.0 license. Use it for research, dashboards, citation tracking, or to build your own evidence tools — provided you attribute the source.

Endpoints

GET/api/registry

Full registry as JSON, wrapped in a metadata envelope.

curl https://www.experimentsociety.org/api/registry | jq '.counts'

GET/api/registry/{id}

A single experiment by ID.

curl https://www.experimentsociety.org/api/registry/stockton-seed | jq '.data.title'

GET/api/registry.csv

Full registry as CSV (RFC 4180). Suitable for spreadsheet apps and R/pandas.

curl -OJ https://www.experimentsociety.org/api/registry.csv

Schema

Every JSON record has the following fields. CSV exports include the same fields except the relationship arrays (replicates, relatedTo) — fetch the JSON if you need those.

Field	Type	Description
id	string	Stable slug used in registry URLs (/registry/[id]). Safe for URL paths.
title	string	Plain-language title of the experiment as it appears on the detail page.
institution	string	Organization that ran the trial (e.g. 'J-PAL', 'Stanford', city department).
location	string	Geographic location, free-text. Use getCountry() to derive a canonical country name.
year	integer	Year the trial ran (or for multi-year trials, the year results were first published).
policyArea	enum	One of the 17 policy areas (see /api/registry for full list; e.g. 'Tax & Revenue', 'Public Health').
mechanism	enum	Intervention mechanism: 'Social norms' \| 'Default' \| 'Simplification' \| 'Personalization' \| 'Information' \| 'Targeting' \| 'Human capital' \| 'Cash transfer' \| 'Price signal' \| 'Community engagement' \| 'Housing' \| 'Commitment device'.
question	string	The research question the trial set out to answer.
intervention	string	What the treatment arm actually did, in concrete terms.
assignmentMethod	string	Randomization or quasi-experimental method (e.g. 'randomized controlled trial', 'difference-in-differences').
sampleSize	string	Sample size, free-text — may include unit (households, individuals, students).
primaryOutcome	string	The primary outcome measured.
effectEstimate	string	Headline effect estimate with units (e.g. '+5.2 pp on vaccination rate').
result	enum	'positive' \| 'null' \| 'negative' \| 'mixed'.
replicationStatus	enum	'replicated' \| 'partial' \| 'open' \| 'na'.
decision	string	Real-world decision taken after the result (scaled, ended, expanded, etc.).
summary	string	Multi-sentence plain-language summary (2-5 sentences typical).
reportUrl	string?	Optional URL to the primary report, paper, or evaluation document.
replicates	string[]?	Optional array of registry IDs that this entry replicates (later trials → earlier trials).
relatedTo	string[]?	Optional array of registry IDs of cross-referenced experiments.

Current counts

As of this build: 140 experiments across 27 countries, organized into 17 policy areas and 12 intervention mechanisms. The counts in /api/registry reflect the current build at request time.

New entries are added regularly. Subscribe to the Dispatch or watch /registry for additions.

License & attribution

The registry is released under the Creative Commons Attribution 4.0 license (CC-BY 4.0). You may use, adapt, redistribute, or build commercial products on top of the data, provided you give appropriate credit.

Suggested attribution:

The Experiment Society (2026). Public Registry of Civic Experiments.
https://www.experimentsociety.org/registry

BibTeX:

@misc{experiment_society_registry,
  title  = {Public Registry of Civic Experiments},
  author = {{The Experiment Society}},
  year   = {2026},
  url    = {https://www.experimentsociety.org/registry},
  note   = {CC-BY 4.0}
}

Stability & contact

The API is versioned via the apiVersion field in the response envelope. New fields may be added at any time; existing fields will not be renamed or removed without a major-version bump. Endpoints are static, CDN-cached for one hour, and CORS-enabled for all origins.

Built something with this? We'd love to hear about it — hello@experimentsociety.org. Found a data error or want to submit an entry? Same address.