AIMR Sites API

Read-only JSON API over the Global Clinical Research Site Database. Free for non-commercial use.

The AIMR Sites API exposes aggregated data on 142,889 clinical research sites across 241 countries, sourced from 14 public trial registries and enrichment datasets. All endpoints return JSON, are read-only, and require no authentication.

Rate limit: 60 requests per 60 seconds per IP. If you need higher throughput for research, email info@aimronline.org.

Base URL

https://api.aimronline.org/api/v1

Endpoints

Database statistics

GET /stats

curl https://api.aimronline.org/api/v1/stats

{
  "total_sites": 142889,
  "countries": 241,
  "mapped": 132725,
  "source_registries": 14,
  "external_linked": 30093,
  "by_tier": {"A": 14757, "B": 28483, "C": 40419, "D": 54502},
  "last_updated": "2026-04-18"
}

Search sites

GET /sites?<filters>

All filters are optional and combinable. Results are paginated (max 500/page).

Param	Type	Example	Description
`country`	string	`Germany`	Exact country name
`tier`	string	`A`	Insight quality tier: A/B/C/D
`ta`	string	`Oncology`	Primary therapeutic area (exact)
`has_ta`	string	`Cardiology`	Site has this TA in its full list
`facility_type`	string	`University Hospital`	Exact
`regulator`	string	`Federal Institute for Drugs...`	Exact regulator name
`network`	string	`Mass General Brigham`	Exact network name
`min_trials`	int	`50`	trial_count ≥ N
`identified_only`	bool	`1`	Exclude area-only anonymized markers
`active_only`	bool	`1`	trial_count ≥ 2
`q`	string	`Cleveland`	Free-text LIKE on name + city
`sort`	string	`-trial_count`	Field to sort; prefix `-` for desc. Allowed: `trial_count`, `recent_trials_3yr`, `quality_score`, `investigator_count`, `total_enrollment`, `external_rank_global`, `canonical_name`
`limit`	int	`50`	Default 50, max 500
`offset`	int	`0`	For pagination

curl 'https://api.aimronline.org/api/v1/sites?country=Germany&tier=A&min_trials=100&sort=-trial_count&limit=3'

Site detail

GET /sites/{location_id}

Returns full public fields for one site, including any external data linkages and available investigators.

curl https://api.aimronline.org/api/v1/sites/971366

Countries

GET /countries

All countries with site counts, ordered by site count descending.

Regulatory authorities

GET /regulators

National regulator for each ISO alpha-2 country.

Therapeutic areas

GET /therapeutic-areas

Primary TAs with site counts.

OpenAPI spec

GET /openapi.json

Response envelope (search)

{
  "total": 1234,
  "limit": 50,
  "offset": 0,
  "results": [ { /* site object */ }, ... ]
}

Site object fields

Field	Type	Notes
`location_id`	int	Primary key
`canonical_name`, `city`, `state`, `country`	string	—
`latitude`, `longitude`	float	WGS84
`geo_precision`	string	e.g. `building_geocoded`, `city_centroid`
`trial_count`, `active_recruiting`, `recent_trials_3yr`	int	Multi-registry aggregate
`top_conditions`, `therapeutic_areas`, `primary_ta`	string	Semicolon-delimited
`top_sponsors`	string	Semicolon-delimited
`investigator_count`, `total_enrollment`, `avg_enrollment`	number	Aggregate
`network_name`, `network_type`, `facility_type`	string	—
`regulatory_authority`	string	National regulator
`external_uuid`	string	External linkage (if present)
`external_rank_global`, `external_rank_country`	int	External CT.gov-based ranking
`external_nct_count_est`	int	Parallel CT.gov-only trial count. Not a replacement for `trial_count`.
`quality_score`, `site_tier`	—	0.0–1.0 and A/B/C/D. Methodology
`site_identification`	string	`identified`, `partial`, or `area_only`
`data_sources`	string	Comma-delimited source registries

Examples

Find top oncology sites in Poland

GET /sites?country=Poland&has_ta=Oncology&tier=A&sort=-trial_count&limit=20

All sites regulated by EMA

GET /sites?regulator=European%20Medicines%20Agency%20(EMA)&limit=100

Actively-recruiting cardiology sites in Brazil

GET /sites?country=Brazil&has_ta=Cardiology&active_only=1&sort=-active_recruiting

Full profile by id

GET /sites/971366

Error responses

{ "error": "not_found" }                     // 404
{ "error": "rate_limited", "message": "..." } // 429

Versioning

Current version: v1 (stable). Breaking changes will introduce v2; v1 will remain available for at least 12 months after any deprecation announcement.

License & attribution

Data is aggregated from publicly available trial registries and government datasets (CT.gov, CTRI, ISRCTN, ANZCTR, EU CTIS, PACTR, IRCT, DRKS, JPRN, ChiCTR, KCT, ReBEC, NPPES, CMS, FDA, OSM, GeoNames). Please cite "AIMR Global Clinical Research Site Database" when using in publications. The American Institute for Medical Research is a non-profit organization.

← Back to the map · About the database