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
216,137
agents + MCP servers indexed
A2A agents
8,970
across 45 sources
MCP servers
207,167
from 15 registries · by 31,047 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_warm7,142
recrawl_hot5,898
agentic_market3,495
cdp_discovery3,154
manifests1,787
n8n_workflows1,233
x402_list1,018
mcp_registry972
smithery761
registry683
a2aregistry597
github_code563
a2a_registry_org307
dexter_discovery181
recrawl_paid142
lists129
submitted94
mpp93
8004scan88
erc800462
pay_sh50
github_topics35
a2a-validate33
sitemap21
ultravioleta_discovery18
20 other sources107

MCP sources

glama87,237
mcp.so18,559
pypi10,203
n8n8,291
docker8,134
npm8,106
pulsemcp4,474
sadri3,755
x4023,024
io.github.sadri-dridi2,341
direct2,238
io.github.pipeworx-io1,593
mcp-dir1,128
io.github.mcp-dir1,113
evozim-hv1,028
io.github.mrfentmen780
io.github.evozim375
io.github.csoai-org354
jsr349
docker-mcp271
jmshinhwa226
ai.smithery214
x402/scoutgate214
composio207
other167
31,037 other sources42,786

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

Different registries cover different hosts. Agenstry combines public records and applies the same published checks across them. Hosted agents are labelled and receive no ranking advantage; placement and scores cannot be bought.

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. To add one, email hello@agenstry.com with the registry's API and we will write the adapter.