This paper summarizes the Government of Canada API Standards, which define how APIs should be designed and secured to support interoperable digital services across federal departments and agencies. The standards promote RESTful architectures, clear and consistent message schemas, and a security-first approach that enforces secure communications and strong access controls. They also emphasize interoperability through consistent metadata and encoding, lifecycle management with defined service levels, and performance benchmarking with throttling to protect availability. Recent regulatory developments increase the importance of these practices, including stricter incident reporting requirements, heightened oversight of operational resilience, and proposed legislation that raises penalties for

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