Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers)

Where this market publishes its structure

• BSR Connect API ModuleService/ListModules + OwnerService/GetOwners (buf.build, unauthenticated) machine-readable, 7,592 public modules, 1,759 organizations, 2,336 users; 58 providers linked (22 domain, 36 register-name hand reviewed); 101 org domains unheld by the catalog
• buf.build/explore and buf.build/ pages machine-readable, client-rendered view of the same API data; not scraped separately
• BSR OrganizationService/ListOrganizations not machine-readable: requires login (unauthenticated -> 'this action requires you to log in'); owners resolved through GetOwners from module owner ids instead
• buf.build/docs/reference machine-readable, API documentation only, not a register

Own = declares at least one integration itself; covered = visible only because an aggregator, standards body, regulator or partner contract names it; distribution-only = listed only on cloud marketplaces it sells through, a channel reported beside, never counted as its own declared integrations; undeclared = nothing we can read, so no number; declares_compatibility = providers with a `compatible` shape vote, report only (kin, 2026-10-13): never counted as own, never in depth or position.

Taxonomy how this market maps onto apis.io

Derived 2026-10-23 from the 159 providers in this market we could resolve in the catalog. The percentage is the share of those providers carrying each one; it describes the market, not the tag or industry. Tag groups have no page of their own yet, so they are listed unlinked.

share of resolved cohort carrying it; tags >=0.20 & >=3 members (max 12, junk dropped), tag_groups >=0.20 (cooccurrence, non-cross-cutting; max 8), industries >=0.20 (max 6), areas >=0.10 (max 6; areas are keyword-matched and sparse), capabilities L1 >=0.20 (max 8); derive-market-taxonomy.py

Leaders by position (provisional)

Provisional: grouped by position, depth compared within a position only. Distribution (cloud marketplaces) and iPaaS bridges are counted beside position, never inside it. Unknown-builder listings are left out of position shares and counted here.

undeclared 159 · declares nothing we can read: no number