OpenCost

OpenCost is an open-source specification and reference implementation for measuring and allocating cloud and Kubernetes costs in real time. A CNCF Sandbox project born out of Kubecost’s open model, it defines a vendor-neutral way to answer a hard operational question: what does each workload, namespace, team, or product actually cost to run? By standardizing how cost is calculated and exposed, it turns opaque cloud bills into data engineers and finance can both trust.

• A cost allocation specification - Defines a consistent model for attributing infrastructure spend down to Kubernetes workloads, not just the monthly invoice.
• Real-time monitoring - Surfaces cost as workloads run, rather than reconciling after the billing period closes.
• Cloud-provider aware - Reconciles usage against actual AWS, Azure, and GCP billing data for accurate, multi-cloud allocation.
• CNCF-governed and vendor-neutral - An open standard the FinOps community can adopt without locking into a single vendor’s tooling.

In real operations OpenCost is where FinOps meets the infrastructure that APIs and services run on. Platform teams deploy it to allocate shared Kubernetes spend back to the products and teams driving it, exposing cost metrics through an API and integrating them into observability and chargeback workflows. As more of an organization’s API estate runs on cloud-native infrastructure, a standardized cost signal becomes part of governing that estate responsibly — and increasingly a data source that automated and agent-driven systems can read to reason about the economics of what they operate.