Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Strong 3 Solid coverage with minor gaps

Google Vault Matters APIThe Matters API from Google Vault — 8 operation(s) for matters.62.6 LawVu Matters APIThe Matters API from LawVu — 11 operation(s) for matters.58.6 Filevine Projects APIList, create, read, and update Filevine projects (matters/cases). Each project belongs to a project type, c...57.4

Developing 5 Usable, with meaningful gaps to close

LeanLaw Matter APIThe Matter API from LeanLaw — 2 operation(s) for matter.54.1 Clio Matters API[Matters](https://help.clio.com/hc/en-us/articles/9285920226075-Clio-Manage-Matters-Overview) in Clio repre...53.3 Luminance Matters APIThe Matters API from Luminance — 22 operation(s) for matters.45.1 Smokeball Matters APIThe Matters API from Smokeball — 6 operation(s) for matters.42.5 Rocket Matter Matters APIThe Matters API from Rocket Matter — 22 operation(s) for matters.41.8

Thin 2 Limited public surface area

SimpleLegal Matters APIThe Matters API from SimpleLegal — 2 operation(s) for matters.38.5 CosmoLex APIWeb services API for CosmoLex legal practice management. Enables programmatic access to matters, time entri...32.7

Emerging 2 Early or largely undocumented

Litify Docrio APIProvides access to Litify's Docrio document management layer, enabling integrators to create, retrieve, and...18.4 Litify Salesforce REST APIProvides access to the Litify legal operating system via the Salesforce REST API. Supports managing matters...18.4

Minimal 1 Almost no public developer surface

LEAP Matters & Contacts APIModeled matter and contact/client management surface that third-party Marketplace apps integrate against - ...9.1

Companies reaching this through an API (10)

These companies publish an API, specification or operation carrying “Matter” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Clio CosmoLex Google Vault LawVu LeanLaw LEAP Litify Luminance Rocket Matter SimpleLegal

Score breakdown

Frequency

38.7

log-scaled weighted occurrences

Breadth

0.2

spread across providers

Quality lift

42.6

mean composite of providers using it

Cohesion

6.6

strength of nearest seed neighbor

Where this tag comes from

Provider tag6

Api tag13

Openapi tag3

Openapi op tag20

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Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

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This tag

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All tags

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As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/matter"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/matter/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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Matter

Providers using this tag (6)

APIs with this tag (13)