WunderGraph Cosmo

What WunderGraph Cosmo is

WunderGraph Cosmo is an open-source GraphQL Federation platform for platform teams, with schema checks, guardrails, and observability. It brings GraphQL, REST, gRPC, and Kafka into a federated graph, supports Apollo Federation versions 1 and 2, and works with existing GraphQL services across frameworks and languages. Cosmo Router is a Go-based, Apache 2.0-licensed gateway. Teams can host it using Docker, Kubernetes, or an AWS Lambda-optimized binary, or use WunderGraph's managed service. The Schema Registry checks composition, breaking changes, client traffic, and linting. Subscriptions work over WebSockets and Server-Sent Events, with event-driven options backed by Kafka, NATS, SQS, or RabbitMQ. Cosmo provides OpenTelemetry tracing and Prometheus metrics for export to compatible monitoring backends. The router's default settings are designed to keep sensitive request information out of the control plane and analytics. The free Developer plan includes one graph, 10M requests per month, 10 subgraphs, one team member, seven-day retention, and community support. Launch costs $499 a month; managed plans include SOC 2 and HIPAA compliance, and the site identifies ISO 27001 certification.

Who it suits

Cosmo is aimed at platform teams consolidating services into a federated graph, from an initial subgraph to large-scale operations. It suits teams that need schema governance, deployment flexibility, and telemetry export.

Limits

The free Developer plan allows one federated graph, 10M requests/month, 10 subgraphs and one team member, with seven-day retention. Launch costs $499 / month and raises those limits to two graphs, 250M requests/month, 20 subgraphs and 10 team members, with 14-day retention.

Getting started

1. Open the WunderGraph Cosmo website.
2. Choose whether to use the managed service or self-host the router.
3. For self-hosting, use Docker, Kubernetes or the AWS Lambda-optimized binary.
4. Select the Developer free plan or a paid plan.
5. Configure a federated graph and add subgraphs.

Verdict

Cosmo combines federation, schema governance, subscriptions, and observability with self-hosted and managed deployment options. Its free Developer plan has limits on graphs, team size, and retention; Launch begins at $499 a month.