Karol Krogulec
Senior Engineering Manager at Acoustic
With Cosmo, we saved an estimated $178,000 just on building those features. That doesn't even include the cost of maintaining or supporting them long term.
Open-Source
GraphQL Federation
Build and run your supergraph
with governance and no lock-in.
WunderGraph Cosmo is an enterprise-ready platform for teams scaling from their first subgraph to thousands of daily operations.
Trusted by teams running federation at scale
Built for scale
WunderGraph Cosmo runs your supergraph at scale.
As your graph grows past 20 subgraphs, Cosmo keeps every team shipping independently, without stepping on each other.
For platform teams
Ship independently with safe schema changes.
Schema proposals, automated composition checks, and breaking-change detection catch problems at the pull request, so every team moves at its own pace.
For consumer teams
Find what exists and who owns it.
Teams design, review, and ship faster when every field has an owner and the whole graph is explorable.
For engineering leadership
Scale federation without giving up control.
Open-source router, no usage penalties, full audit log, RBAC, and self-host or managed cloud options keep you in control as you scale.
Ready to go further
Keep the openness. Add the guardrails.
Cosmo runs your graph. WunderGraph Hub is where teams design and govern it, with every schema change proposed on a branch, checked against live traffic, and approved by the people who own the affected subgraphs before it merges.
CapabilitiesConnect any service.
Connect any service.
Stream real-time. Serve AI agents.
Connect any service, stream real-time events, and expose your graph to AI agents, without adding infrastructure complexity.
Connect
Bring in any service.
Backend teams write plain gRPC in the language they already use. The router handles the GraphQL query planning, batching, entity resolution.
See how Connect works
Streams
The router handles subscriptions.
Services emit events to Kafka, NATS, or Redis. The router holds every client connection and pushes updates, so subgraphs stay stateless.
See how Streams works
MCP Gateway
One gateway for your graph.
Skip building an MCP server for every service. The router already knows your graph, turning each approved operation into an agent-ready tool with built-in auth.
Run MCP in 5 minutes
Customers
This is why customers use us.
Tim Caplis
Principal Software Engineer at SoundCloud
Our infrastructure costs went from $14,000 with our previous provider down to $9,750 with Cosmo, even with some extra infra costs.
NerdWallet
Engineering Team
After enabling Cosmo's Cache Warmer, NerdWallet eliminated repeated 10+ second query planning delays on its slowest operations. Planning time dropped to under a second after warmup, helping the team scale more predictably during planned traffic events.
Bryan Woodruff
Vice President of Seller Experience Engineering at eBay
Our investment in WunderGraph's highly performant open-source platform will help boost eBay's API ecosystem and enable our teams to work faster and smarter in building products that help our sellers thrive.
Nick Tsianos
Chief Architect at Luxury Presence
I just liked the approach from WunderGraph, It felt optimized for the kind of development we were trying to do.
Fredrik Wärnsberg
Vice President of Engineering at Soundtrack Your Brand
We have experienced significant performance enhancements for our most complex queries since switching from Apollo to Cosmo. The query planning in Cosmo is more advanced and intelligently optimized.
WunderGraph Hub
The next step in your governance layer.
Cosmo runs your supergraph. Hub gives your teams the shared canvas to design, review, and ship schema changes together, with ownership, proposals, and safe deploys built in.
Launch Now
Deploy your federated graph in minutes.
No credit card required.