Every registry, one neutral index

Agenstry federates from every major A2A + MCP registry, including the cloud-vendor registries that lock in their tenants. We're the Switzerland between AWS, Google Cloud, Microsoft, Anthropic, and the community standards bodies. Cross-cloud routing only works if there's a neutral index.

Total federated
123,439
agents + MCP servers indexed
A2A agents
4,465
across 29 sources
MCP servers
118,974
from 13 registries · by 12,357 publishers

Per-source counts below can overlap, as one agent often appears in multiple sources (e.g. a2aregistry + GitHub code + crt.sh). The headline above is the count of distinct domains.

Per-source breakdown

Top 25 sources by indexed count. The long tail (individual GitHub forks, single-repo MCP authors) is rolled into the "other sources" row at the bottom of each table.

A2A sources

recrawl_hot2,072
agentic_market1,743
recrawl_warm1,633
mcp_registry1,089
manifests571
github_code537
lists457
recrawl_cold266
registry230
cdp_discovery228
github_topics141
n8n_workflows92
a2aregistry92
smithery72
crtsh38
submitted24
seeds13
erc800411
manual_recrawl4
manual-verify3
manual3
ct3
test_fix_verification1
sitemap1
recrawl_weekly1
4 other sources4

MCP sources

glama61,036
pypi8,939
docker7,560
n8n5,138
npm4,692
pulsemcp4,454
mcp.so3,604
x4022,122
io.github.pipeworx-io1,217
direct999
io.github.csoai-org305
jsr276
ai.smithery263
io.github.CSOAI-ORG210
io.github.codespar126
x402/scoutgate126
app.wishpool125
io.github.cyanheads125
x402/eruditepay-tron122
x402/eruditepay-base111
eu.ansvar106
io.github.Br0ski777101
io.github.br0ski777101
io.github.evozim99
io.github.mcp-dir97
12,345 other sources16,920

Federation sources

Community + standards

A2A community registries

MCP registries

Anthropic + community MCP

Cloud-vendor registries

AWS · Google · Microsoft · Cloudflare

Code + package ecosystems

GitHub · npm · PyPI · Docker

  • GitHub topics: a2a-agent, a2a-protocol, mcp-server
  • GitHub code search: well-known/agent-card.json
  • npm: @modelcontextprotocol/* + community MCP packages
  • PyPI: mcp-* packages
  • Docker Hub: mcp/* images
Curated awesome lists

7 community-maintained README crawls

  • pab1it0/awesome-a2a
  • sing1ee/a2a-directory
  • ai-boost/awesome-a2a
  • punkpeye/awesome-mcp-servers
  • wong2/awesome-mcp-servers
  • appcypher/awesome-mcp-servers
  • modelcontextprotocol/servers
Long-tail discovery

Certificate Transparency + manifests

  • Certspotter CT logs, domains issuing TLS certs with agent-related names
  • crt.sh, keyword-matched certificates
  • Manifest expansion, well-known paths on every discovered domain
Business-identity registries

8 authoritative registries

  • GLEIF (global LEI)
  • UK Companies House
  • Netherlands KvK
  • Australia ABN Lookup
  • Germany Handelsregister
  • EU BRIS network
  • Canada Federal Corporations
  • USA OpenCorporates

Used for the verified-business badge. See /api/registries.

Why neutral federation matters

Each cloud-vendor registry is, by design, scoped to its tenants. AWS won't index agents that live in Google Cloud; Microsoft won't surface those that live in AWS. As intra-cloud A2A adoption grows, the agent web fragments along the same lines as today's email-vs-Slack-vs-Teams divide.

Agenstry is structurally neutral: we don't host runtime, we don't sell cloud capacity, we don't compete with any vendor for tenants. Counterparty agents in any cloud can rely on us as the cross-cloud directory + trust layer without picking sides. Network effects flow to the only neutral index.

Live coverage funnel

For a real-time per-source breakdown of how many candidate URLs each federation source surfaces, how many become valid agent cards, and how many respond to live JSON-RPC, see the compliance funnel.

Are we missing your registry?

Agenstry ships open-source adapters under app/crawler/ and app/registries/. New registries plug in with a single file implementing the RegistryAdapter interface. Open a PR or email hello@agenstry.com.