Historical Exchange IndexExchange IndexA quiet registry of crypto exchanges, active and gone.

Data quality

Quality and coverage

Inspect where the registry is strong, where evidence or archives are thin, and which reviewed records need further strengthening.

Entities1075
Events1140
Evidence4111
Generated2026-10-07
Entity archive coverage95%

entities with an archived URL

High-confidence entities58%

share of all reviewed entities

Average evidence per entity3.8

total evidence records divided by entities

High-reliability evidence52%

2130 of 4111 evidence records

Archived evidence share89%

3671 / 4111 evidence items

Entities with 0 evidence0

0% of entities

Entity confidence

Reviewed confidence classification on exchange entity records.

High625 · 58%
Medium439 · 41%
Low11 · 1%

Evidence reliability

Reviewed reliability classification on public evidence records.

High2130 · 52%
Medium1929 · 47%
Low52 · 1%

Evidence depth by entity

Number of evidence records associated with each reviewed exchange entity.

zero0 · 0%
1 source2 · 0%
2–4 sources774 · 72%
5+ sources299 · 28%

Record freshness

Time since the entity record was last reviewed, using last_verified_at.

0–30 days15 · 1%
31–90 days501 · 47%
91–180 days544 · 51%
181–365 days15 · 1%

Coverage

Archive, date, origin, domain, and confidence coverage with explicit denominators.

MetricValueDenominator / note
Archive coverage951018 / 1075 entities
Dead-side archive coverage100231 / 231 dead-side
Active-side archive coverage93787 / 844 active-side
High-confidence share58625 / 1075 entities
Launch date known43464 / 1075 entities
Death date known97224 / 231 dead-side
Origin known1001075 / 1075 entities
Original domain known951018 / 1075 entities

Evidence source types

Composition of the public evidence layer by source category.

Official statement1606 · 39%
Official blog241 · 6%
Official social47 · 1%
Archive capture179 · 4%
News article682 · 17%
Court document12 · 0%
Regulatory notice169 · 4%
Database reference1102 · 27%
Community reference67 · 2%
Other6 · 0%

Evidence claim scope

What kind of registry claim each evidence record is intended to support.

Entity1218 · 30%
Event923 · 22%
Status1201 · 29%
Death reason54 · 1%
Launch date403 · 10%
Death date68 · 2%
URL history198 · 5%
Ownership46 · 1%

Selected missing-field counts

Visible selected field gaps. A retained unknown value is not automatically an error.

MetricValueDenominator / note
Missing launch date61157% of entities
Dead-side missing death date73% of dead-side
Missing origin00% of entities
Missing original domain575% of entities

Completeness indicators

Selected public coverage indicators. These do not form a hidden quality score.

MetricValueDenominator / note
Aliases present78840 / 1075 entities
Notes present1001073 / 1075 entities
Summary present1001075 / 1075 entities
Archived URL present951018 / 1075 entities
Dead-side with 2+ evidence100230 / 231 dead-side
Entities with 0 evidence00% of entities
Entities with 1 evidence20% of entities

Metric definitions

Definitions and denominators used to interpret this public summary.

Entity confidence
The reviewed confidence classification stored on each exchange entity record.
All reviewed public entities.
Evidence reliability
The reviewed reliability classification stored on each evidence record.
All reviewed public evidence records.
Evidence depth
How many evidence records are associated with each exchange entity.
All reviewed public entities.
Archive coverage
Whether an entity record includes an archived URL reference. It does not measure the completeness of every historical page.
The entity population named in each metric note.
Record freshness
Elapsed time since the entity last_verified_at date, grouped into review-recency bands.
All reviewed public entities.
Unknown-field rates
Visible missing values in selected public entity fields. Unknown values are not automatically treated as errors.
All entities or dead-side entities, as stated in each metric note.
This summary is generated from reviewed public HEI records. Internal monitoring findings, private research notes, unresolved candidate queues, and operator-only repair priorities are not published here.